merge with upstream

6 years ago · 6899b97fde
parent 43488dae1d 9491d549a0
commit 6899b97fde
25 changed files with 610 additions and 571 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@ -41,7 +41,7 @@ name = "atty"
 version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@ -59,8 +59,8 @@ dependencies = [
 "autocfg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
 "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
 "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

@ -70,7 +70,7 @@ version = "0.1.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -103,7 +103,7 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "bzip2-sys 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -112,7 +112,7 @@ version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -122,9 +122,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -137,16 +137,6 @@ name = "cfg-if"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"

-[[package]]
-name = "chrono"
-version = "0.4.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "clap"
 version = "2.32.0"
@ -168,7 +158,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

@ -179,7 +169,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
 "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

@ -199,8 +189,8 @@ dependencies = [
 "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
 "clicolors-control 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "termios 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@ -216,8 +206,8 @@ dependencies = [
 "clicolors-control 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "encode_unicode 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
 "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "termios 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@ -250,9 +240,9 @@ name = "curl"
 version = "0.4.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "curl-sys 0.4.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "curl-sys 0.4.16 (registry+https://github.com/rust-lang/crates.io-index)",
 "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 "openssl-sys 0.9.40 (registry+https://github.com/rust-lang/crates.io-index)",
 "schannel 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
@ -262,11 +252,11 @@ dependencies = [

 [[package]]
 name = "curl-sys"
-version = "0.4.15"
+version = "0.4.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "libz-sys 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
 "openssl-sys 0.9.40 (registry+https://github.com/rust-lang/crates.io-index)",
 "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
@ -289,7 +279,7 @@ name = "dirs"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "redox_users 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@ -299,6 +289,17 @@ name = "encode_unicode"
 version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"

+[[package]]
+name = "env_logger"
+version = "0.5.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "humantime 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "error-chain"
 version = "0.12.0"
@ -309,21 +310,21 @@ dependencies = [

 [[package]]
 name = "failure"
-version = "0.1.3"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "backtrace 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
 name = "failure_derive"
-version = "0.1.3"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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 "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
 "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.24 (registry+https://github.com/rust-lang/crates.io-index)",
 "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

@ -333,8 +334,8 @@ version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -343,7 +344,7 @@ version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "crc32fast 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "miniz-sys 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
 "miniz_oxide_c_api 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@ -399,10 +400,10 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "backtrace 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 "os_type 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 "termcolor 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
@ -410,25 +411,22 @@ dependencies = [
 ]

 [[package]]
-name = "indicatif"
-version = "0.9.0"
+name = "humantime"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "console 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
-name = "isatty"
-version = "0.1.9"
+name = "indicatif"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "console 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -457,7 +455,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

 [[package]]
 name = "libc"
-version = "0.2.45"
+version = "0.2.46"
 source = "registry+https://github.com/rust-lang/crates.io-index"

 [[package]]
@ -476,7 +474,7 @@ version = "1.0.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
 "vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@ -490,13 +488,21 @@ dependencies = [
 "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "log"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "memchr"
 version = "2.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

@ -506,7 +512,7 @@ version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -524,7 +530,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
 "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "miniz_oxide 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

@ -533,19 +539,6 @@ name = "nodrop"
 version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"

-[[package]]
-name = "num-integer"
-version = "0.1.39"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "num-traits"
-version = "0.2.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "openssl"
 version = "0.10.16"
@ -555,7 +548,7 @@ dependencies = [
 "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
 "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "openssl-sys 0.9.40 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

@ -578,7 +571,7 @@ version = "0.9.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "openssl-src 111.1.0+1.1.1a (registry+https://github.com/rust-lang/crates.io-index)",
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 "vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
@ -611,7 +604,7 @@ dependencies = [

 [[package]]
 name = "parking_lot"
-version = "0.7.0"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@ -623,7 +616,7 @@ name = "parking_lot_core"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
 "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 "smallvec 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
@ -635,8 +628,8 @@ name = "parking_lot_core"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
 "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 "smallvec 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
 "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
@ -660,6 +653,11 @@ dependencies = [
 "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "quick-error"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "quote"
 version = "0.6.10"
@ -674,17 +672,19 @@ version = "0.3.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
 name = "rand"
-version = "0.4.3"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -695,36 +695,35 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
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- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_chacha 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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 "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "rand_os 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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- "rand_xorshift 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
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+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
+ "autocfg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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- "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -756,6 +755,19 @@ dependencies = [
 "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "rand_os"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand_pcg"
 version = "0.1.1"
@ -767,7 +779,15 @@ dependencies = [

 [[package]]
 name = "rand_xorshift"
-version = "0.1.0"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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 dependencies = [
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@ -775,7 +795,7 @@ dependencies = [

 [[package]]
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+version = "0.1.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"

 [[package]]
@ -783,7 +803,7 @@ name = "redox_termios"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -792,9 +812,9 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -847,7 +867,7 @@ dependencies = [

 [[package]]
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-version = "0.1.11"
+version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"

 [[package]]
@ -896,7 +916,7 @@ version = "0.9.0"
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 "semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -906,17 +926,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

 [[package]]
 name = "serde"
-version = "1.0.83"
+version = "1.0.84"
 source = "registry+https://github.com/rust-lang/crates.io-index"

 [[package]]
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+version = "1.0.84"
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 "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -924,17 +944,17 @@ name = "serde_ignored"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
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 "ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -942,33 +962,6 @@ name = "siphasher"
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 source = "registry+https://github.com/rust-lang/crates.io-index"

-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
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-[[package]]
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- "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
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-
 [[package]]
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@ -983,8 +976,8 @@ version = "0.3.8"
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 dependencies = [
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- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
 "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

@ -1020,12 +1013,12 @@ dependencies = [
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 "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
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+version = "0.15.24"
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@ -1040,23 +1033,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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 "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.24 (registry+https://github.com/rust-lang/crates.io-index)",
 "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
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- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
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 ]

@ -1065,7 +1053,7 @@ name = "tempdir"
 version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
 "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

@ -1075,9 +1063,9 @@ version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
 "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

@ -1087,28 +1075,27 @@ version = "3.0.5"
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 dependencies = [
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- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
 "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
-name = "term"
-version = "0.5.1"
+name = "termcolor"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wincolor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
 name = "termcolor"
-version = "0.3.6"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "wincolor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wincolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -1116,8 +1103,8 @@ name = "termion"
 version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
 "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

@ -1126,7 +1113,7 @@ name = "termios"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -1147,11 +1134,11 @@ dependencies = [

 [[package]]
 name = "time"
-version = "0.1.41"
+version = "0.1.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
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 ]

@ -1160,7 +1147,7 @@ name = "toml"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -1202,7 +1189,7 @@ version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -1242,21 +1229,23 @@ dependencies = [
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 "cargo_metadata 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
 "console 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "curl 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
 "dialoguer 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "dirs 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
 "human-panic 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
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 "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "openssl 0.10.16 (registry+https://github.com/rust-lang/crates.io-index)",
 "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
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- "serde_derive 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 "serde_ignored 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
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- "slog 2.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "slog-async 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "slog-term 2.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "siphasher 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 "strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "structopt 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -1272,7 +1261,7 @@ version = "0.1.0"
 dependencies = [
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 "dirs 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 "flate2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -1285,8 +1274,8 @@ name = "which"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -1334,12 +1323,21 @@ dependencies = [
 "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "wincolor"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "xattr"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
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 "checksum smallvec 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)" = "b73ea3738b47563803ef814925e69be00799a8c07420be8b996f8e98fb2336db"
 "checksum socket2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "c4d11a52082057d87cb5caa31ad812f4504b97ab44732cd8359df2e9ff9f48e7"
 "checksum stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dba1a27d3efae4351c8051072d619e3ade2820635c3958d826bfea39d59b54c8"
@ -1475,20 +1472,19 @@ dependencies = [
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 "checksum structopt 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "670ad348dc73012fcf78c71f06f9d942232cdd4c859d4b6975e27836c3efc0c3"
 "checksum structopt-derive 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "ef98172b1a00b0bec738508d3726540edcbd186d50dfd326f2b1febbb3559f04"
-"checksum syn 0.15.23 (registry+https://github.com/rust-lang/crates.io-index)" = "9545a6a093a3f0bd59adb472700acc08cad3776f860f16a897dfce8c88721cbc"
+"checksum syn 0.15.24 (registry+https://github.com/rust-lang/crates.io-index)" = "734ecc29cd36e8123850d9bf21dfd62ef8300aaa8f879aabaa899721808be37c"
 "checksum synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "73687139bf99285483c96ac0add482c3776528beac1d97d444f6e91f203a2015"
-"checksum take_mut 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f764005d11ee5f36500a149ace24e00e3da98b0158b3e2d53a7495660d3f4d60"
 "checksum tar 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)" = "a303ba60a099fcd2aaa646b14d2724591a96a75283e4b7ed3d1a1658909d9ae2"
 "checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
 "checksum tempfile 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "11ce2fe9db64b842314052e2421ac61a73ce41b898dc8e3750398b219c5fc1e0"
 "checksum tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "7e91405c14320e5c79b3d148e1c86f40749a36e490642202a31689cb1a3452b2"
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-"checksum time 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)" = "847da467bf0db05882a9e2375934a8a55cffdc9db0d128af1518200260ba1f6c"
+"checksum time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
 "checksum toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "758664fc71a3a69038656bee8b6be6477d2a6c315a6b81f7081f591bffa4111f"
 "checksum ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"
 "checksum unicode-segmentation 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "aa6024fc12ddfd1c6dbc14a80fa2324d4568849869b779f6bd37e5e4c03344d1"
@ -1510,5 +1506,6 @@ dependencies = [
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+"checksum wincolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "561ed901ae465d6185fa7864d63fbd5720d0ef718366c9a4dc83cf6170d7e9ba"
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--- a/Cargo.toml
+++ b/Cargo.toml
@ -14,21 +14,23 @@ atty = "0.2.11"
 cargo_metadata = "0.6.0"
 console = "0.6.1"
 dialoguer = "0.3.0"
+curl = "0.4.13"
+dirs = "1.0.4"
+env_logger = { version = "0.5.13", default-features = false }
 failure = "0.1.2"
 human-panic = "1.0.1"
 glob = "0.2"
 indicatif = "0.9.0"
 lazy_static = "1.1.0"
+log = "0.4.6"
 openssl = { version = '0.10.11', optional = true }
 parking_lot = "0.6"
 serde = "1.0.74"
 serde_derive = "1.0.74"
 serde_ignored = "0.0.4"
 serde_json = "1.0.26"
-slog = "2.3"
-slog-term = "2.4"
-slog-async = "2.3"
 strsim = "0.8.0"
+siphasher = "0.2.3"
 structopt = "0.2"
 toml = "0.4"
 which = "2.0.0"
--- a/README.md
+++ b/README.md
@ -38,14 +38,15 @@ This project requires Rust 1.30.0 or later.

 ## 📝 Logging

-We generate a `wasm-pack.log` file if `wasm-pack` errors on you, and you can
-customize the log verbosity using the verbosity flag.
-
-| Verbosity     | Result                                              |
-| ------------- |-----------------------------------------------------|
-| -v            | All Info, Warn, and Errors are logged               |
-| -vv           | All Debug, Info, Warn, and Errors are logged        |
-| -vvv          | All Trace, Debug, Info, Warn, and Errors are logged |
+`wasm-pack` uses [`env_logger`] to produces logs when `wasm-pack` runs.
+
+To configure your log level, use the `RUST_LOG` environment variable. For example:
+
+```
+RUST_LOG=info wasm-pack build
+```
+
+[`env_logger`]: https://crates.io/crates/env_logger

 ## 👯 Contributing

--- a/docs/src/tutorial/template-deep-dive/cargo-toml.md
+++ b/docs/src/tutorial/template-deep-dive/cargo-toml.md
@ -3,11 +3,11 @@
 `Cargo.toml` is the manifest file for Rust's package manager, `cargo`. This file contains
 metadata such as name, version, and dependencies for packages, which are call "crates" in Rust.

-There's a bunch of metadata that the template gives us, but there are 3 key parts to discuss:
+There's a bunch of metadata that the template gives us, but there are three key parts to discuss:

- [`crate-type`](#a1-crate-type)
- [`wasm-bindgen` dependency](#a2-wasm-bindgen-dependency)
- [`[features]` and `wee-alloc`, `console-error-panic-hook` dependencies](#a3-features-and-wee-alloc-console-error-panic-hook-dependencies)
+1. [`crate-type`](#a1-crate-type)
+2. [`wasm-bindgen` dependency](#a2-wasm-bindgen-dependency)
+3. [`[features]` and `wee_alloc`, `console_error_panic_hook` dependencies](#a3-features-and-wee_alloc-console_error_panic_hook-dependencies)

 <hr/>

@ -15,7 +15,7 @@ There's a bunch of metadata that the template gives us, but there are 3 key part

 ```toml
 [lib]
-crate-type = ["cdylib"]
+crate-type = ["cdylib", "rlib"]
 ```

 A Rust-`wasm` crate is a bit different from a normal crate, and as a result, we need to note
@ -33,6 +33,9 @@ as a dynamic library to be loaded from another language. In our case, we'll be c
 `.wasm` file, but this output type will create `*.so` files on Linux, `*.dylib` files on
 macOS, and `*.dll` files on Windows in non-`wasm` circumstances.

+`#[crate_type = "rlib"]` signifies that an intermediate "Rust library" file will be produced. 
+This allows tests to use the main crate.
+
 You can read more about linking and crate types, [here](https://doc.rust-lang.org/reference/linkage.html).

 ## 2. `wasm-bindgen` dependency
@ -52,23 +55,24 @@ We'll see more about how to use this library when we discuss what has been gener
 there is no `^` or `~` symbol- it looks like we're locking to the `0.2` version. 
 However, that's not the case! In Rust, the `^` is implied.

-## 3. `[features]` and `wee-alloc`, `console-error-panic-hook` dependencies
+## 3. `[features]` and `wee_alloc`, `console_error_panic_hook` dependencies

 As part of our effort to design a template that helps people discover useful crates
-for their particular use case, this template includes 2 dependencies that can be
+for their particular use case, this template includes two dependencies that can be
 very useful for folks developing Rust-`wasm` crates: `console-error-panic-hook` and
 `wee-alloc`.

-Because these dependencies are useful primarily in a specifc portion of the Rust-`wasm`
+Because these dependencies are useful primarily in a specific portion of the Rust-`wasm`
 crate development workflow, we've also set up a bit of glue code that allows us to include
-them both as dependences, but allowing for them to be optionally included.
+them both as dependencies, but also allows them to be optionally included.

 ```toml
 [features]
-default-features = ["console_error_panic_hook", "wee_alloc"]
+default = ["console_error_panic_hook"]

 [dependencies]
 cfg-if = "0.1.2"
+wasm-bindgen = "0.2"

 # The `console_error_panic_hook` crate provides better debugging of panics by
 # logging them with `console.error`. This is great for development, but requires
@ -79,12 +83,22 @@ console_error_panic_hook = { version = "0.1.1", optional = true }
 # `wee_alloc` is a tiny allocator for wasm that is only ~1K in code size
 # compared to the default allocator's ~10K. It is slower than the default
 # allocator, however.
-wee_alloc = { version = "0.4.1", optional = true }
+#
+# Unfortunately, `wee_alloc` requires nightly Rust when targeting wasm for now.
+wee_alloc = { version = "0.4.2", optional = true }
 ```

-[`cfg-if`] allows us to check if certain features are enabled on a rust crate. We'll
-use this crate in `utils.rs` to optionally enable `console_error_panic_hook` or
-`wee_alloc`. By default, we have them enabled. To disable them, we can remove their
-entry from the `default-features` vector.
+[`cfg-if`] allows us to check if certain features are enabled on a Rust crate. We'll
+use this crate later to optionally enable `console_error_panic_hook` or
+`wee_alloc`.
+
+By default, only `console_error_panic_hook` is enabled. To disable either
+feature, we can remove its name from the `default` vector.
+
+To learn more about these features, we discuss them in-depth in the `src/lib.rs` and 
+`src/utils.rs` sections.
+
+Briefly, they include:

-To learn more about these features, we discuss them in depth in the `utils.rs` section.
+ **console_error_panic_hook** for logging panic messages to the developer console.
+ **wee_alloc**, an allocator optimized for small code size.
--- a/docs/src/tutorial/template-deep-dive/src-lib-rs.md
+++ b/docs/src/tutorial/template-deep-dive/src-lib-rs.md
@ -1,3 +1,127 @@
 # src/lib.rs

-🚧 COMING SOON 🚧
+`lib.rs` is the template's main source file. The name `lib.rs` commonly implies that this Rust project will be compiled as a library.
+
+It contains three key parts:
+
+1. [`#[wasm_bindgen] functions`](#a1-wasm_bindgen-functions)
+2. [Crate imports](#a2-crate-imports)
+3. [`wee_alloc` optional dependecy](#a3-wee_alloc-optional-dependecy)
+	- [What is `wee_alloc`?](#what-is-wee_alloc)
+
+---
+
+We'll start with the most important part of `lib.rs` -- the two `#[wasm_bindgen]` functions. In many cases, this is the only part of `lib.rs` you will need to modify.
+
+## 1. `#[wasm_bindgen]` functions
+
+The `#[wasm_bindgen]` attribute indicates that the function below it will be accessible both in JavaScript and Rust.
+
+```rust
+#[wasm_bindgen]
+extern {
+    fn alert(s: &str);
+}
+```
+
+The `extern` block imports the external JavaScript function `alert` into Rust. This declaration is required to call `alert` from Rust. By declaring it in this way, `wasm-bindgen` will create JavaScript stubs for `alert` which allow us to pass strings back and forth between Rust and JavaScript.
+
+We can see that the `alert` function requires a single parameter `s` of type `&str`, a string. In Rust, any string literal such as `"Hello, test-wasm!"` is of type `&str`. So, `alert` could be called by writing `alert("Hello, test-wasm!");`.
+
+We knew to declare `alert` in this way because it is how we would call `alert` in JavaScript -- by passing it a string argument.
+
+```rust
+#[wasm_bindgen]
+pub fn greet() {
+    alert("Hello, test-wasm!");
+}
+```
+
+If we were to write the `greet` function without the `#[wasm_bindgen]` attribute, then `greet` would not be easily accessible within JavaScript. Furthermore, we wouldn't be able to natively convert certain types such as `&str` between JavaScript and Rust. So, both the `#[wasm_bindgen]` attribute and the prior import of `alert` allow `greet` to be called from JavaScript.
+
+This is all you need to know to interface with JavaScript! If you are curious about the rest, read on.
+
+## 2. Crate imports
+
+```rust
+extern crate cfg_if;
+extern crate wasm_bindgen;
+```
+
+In `Cargo.toml`, we included the crates `cfg_if` and `wasm_bindgen` as project dependencies.
+
+Here, we explicitly declare that these crates will be used in `lib.rs`.
+
+```rust
+mod utils;
+```
+This statement declares a new module named `utils` that is defined by the contents of `utils.rs`. Equivalently, we could place the contents of `utils.rs` inside the `utils` declaration, replacing the line with:
+
+```rust
+mod utils {
+    // contents of utils.rs
+}
+```
+
+Either way, the contents of `utils.rs` define a single public function `set_panic_hook`. Because we are placing it inside the `utils` module, we will be able to call the function directly by writing `utils::set_panic_hook()`. We will discuss how and why to use this function in `src/utils.rs`.
+
+
+```rust
+use cfg_if::cfg_if;
+```
+
+`use` allows us to conveniently refer to parts of a crate or module. For example, suppose the crate `cfg_if` contains a function `func`. It is always possible to call this function directly by writing `cfg_if::func()`. However, this is often tedious to write. If we first specify `use cfg_if::func;`, then `func` can be called by just writing `func()` instead.
+
+With this in mind, this `use` allows us to call the macro `cfg_if!` inside the crate `cfg_if` without writing `cfg_if::cfg_if!`.
+
+```rust
+use wasm_bindgen::prelude::*;
+```
+
+Many modules contain a prelude, a list of things that should be automatically imported. This allows common features of the module to be conveniently accessed without a lengthy prefix. For example, in this file we can use `#[wasm_bindgen]` only because it is brought into scope by the prelude.
+
+The asterisk at the end of this `use` indicates that everything inside the module `wasm_bindgen::prelude` (i.e. the module `prelude` inside the crate `wasm_bindgen`) can be referred to without prefixing it with `wasm_bindgen::prelude`.
+
+For example, `#[wasm_bindgen]` could also be written as `#[wasm_bindgen::prelude::wasm_bindgen]`, although this is not recommended.
+
+## 3. `wee_alloc` optional dependecy
+
+```rust
+cfg_if! {
+    if #[cfg(feature = "wee_alloc")] {
+        extern crate wee_alloc;
+        #[global_allocator]
+        static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
+    }
+}
+```
+
+This code block is intended to initialize `wee_alloc` as the global memory allocator, but only if the `wee_alloc` feature is enabled in `Cargo.toml`.
+
+We immediately notice that `cfg_if!` is a macro because it ends in `!`, similarly to other Rust macros such as `println!` and `vec!`. A macro is directly replaced by other code during compile time.
+
+During compile time, `cfg_if!` evaluates the `if` statement. This tests whether the feature `wee_alloc` is present in the `[features]` section of `Cargo.toml` (among other possible ways to set it).
+
+As we saw earlier, the `default` vector in `[features]` only contains `"console_error_panic_hook"` and not `"wee_alloc"`. So, in this case, the `cfg_if!` block will be replaced by no code at all, and hence the default memory allocator will be used instead of `wee_alloc`.
+
+```rust
+extern crate wee_alloc;
+#[global_allocator]
+static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
+```
+
+However, suppose `"wee_alloc"` is appended to the `default` vector in `Cargo.toml`. Then, the `cfg_if!` block is instead replaced with the contents of the `if` block, shown above.
+
+This code sets the `wee_alloc` allocator to be used as the global memory allocator.
+
+### What is `wee_alloc`?
+
+Reducing the size of compiled WebAssembly code is important, since it is often transmitted over the Internet or placed on embedded devices.
+
+> `wee_alloc` is a tiny allocator designed for WebAssembly that has a (pre-compression) code-size footprint of only a single kilobyte.
+
+[An analysis](http://fitzgeraldnick.com/2018/02/09/wee-alloc.html) suggests that over half of the bare minimum WebAssembly memory footprint is required by Rust's default memory allocator. Yet, WebAssembly code often does not require a sophisticated allocator, since it often just requests a couple of large initial allocations.
+
+`wee_alloc` trades off size for speed. Although it has a tiny code-size footprint, it is relatively slow if additional allocations are needed.
+
+For more details, see the [`wee_alloc` repository](https://github.com/rustwasm/wee_alloc).
--- a/docs/src/tutorial/template-deep-dive/src-utils-rs.md
+++ b/docs/src/tutorial/template-deep-dive/src-utils-rs.md
@ -1,3 +1,66 @@
 # src/utils.rs

-🚧 COMING SOON 🚧
+The purpose of `utils.rs` is to define the `utils` module, which contains a single function `set_panic_hook`. This function becomes part of the `utils` module in `lib.rs`, as described in the preceding section.
+
+If the `console_error_panic_hook` feature is not enabled, then `set_panic_hook` is defined to be an inlined empty function. So, there is no run-time performance or code-size penalty incurred by its use.
+
+We will discuss:
+1. [Defining `set_panic_hook`](#a1-defining-set_panic_hook)
+2. [What is `console_error_panic_hook`?](#a2-what-is-console_error_panic_hook)
+
+
+---
+
+## 1. Defining `set_panic_hook`
+
+```
+use cfg_if::cfg_if;
+```
+
+This allows us to write `cfg_if!` instead of `cfg_if::cfg_if!`, identically to the line in `src/lib.rs`.
+
+```
+cfg_if! {
+    if #[cfg(feature = "console_error_panic_hook")] {
+        extern crate console_error_panic_hook;
+        pub use self::console_error_panic_hook::set_once as set_panic_hook;
+    } else {
+        #[inline]
+        pub fn set_panic_hook() {}
+    }
+}
+```
+
+As described in the preceding section, the macro `cfg_if!` evaluates the `if` statement during compile time. This is possible because it is essentially testing whether `"console_error_panic_hook"` is defined in the `[features]` section of `Cargo.toml`, which is available during compile time.
+
+The entire macro block will either be replaced with the statements in the `if` block or with those in the `else` block. These two cases are now described in turn:
+
+```
+extern crate console_error_panic_hook;
+pub use self::console_error_panic_hook::set_once as set_panic_hook;
+```
+
+Due to the `use` statement, the function `self::console_error_panic_hook::set_once` can now be accessed more conveniently as `set_panic_hook`. Due to `pub`, this function will be publicly accessible outside of the `utils` module as `utils::set_panic_hook`.
+
+```
+#[inline]
+pub fn set_panic_hook() {}
+```
+
+An inline function replaces the function call with the contents of the function during compile time. Here, `set_panic_hook` is defined to be an empty inline function. This allows the use of `set_panic_hook` without any run-time or code-size performance penalty if the feature is not enabled.
+
+## 2. What is `console_error_panic_hook`?
+
+The crate `console_error_panic_hook` enhances error messages in the web browser. This allows you to easily debug WebAssembly code.
+
+Let's compare error messages before and after enabling the feature:
+
+**Before:** `"RuntimeError: Unreachable executed"`
+
+**After:** `"panicked at 'index out of bounds: the len is 3 but the index is 4', libcore/slice/mod.rs:2046:10"`
+
+To do this, a panic hook for WebAssembly is provided that logs panics to the developer console via the JavaScript `console.error` function. 
+
+Note that although the template sets up the function, your error messages will not automatically be enhanced. To enable the enhanced errors, call the function `utils::set_panic_hook()` in `lib.rs` when your code first runs. The function may be called multiple times if needed.
+
+For more details, see the [`console_error_panic_hook` repository](https://github.com/rustwasm/console_error_panic_hook).
--- a/src/bindgen.rs
+++ b/src/bindgen.rs
@ -4,9 +4,10 @@ use child;
 use command::build::BuildProfile;
 use emoji;
 use failure::{self, ResultExt};
+use log::debug;
+use log::{info, warn};
 use manifest::CrateData;
 use progressbar::Step;
-use slog::Logger;
 use std::fs;
 use std::path::{Path, PathBuf};
 use std::process::Command;
@ -26,7 +27,6 @@ pub fn install_wasm_bindgen(
    version: &str,
    install_permitted: bool,
    step: &Step,
-    log: &Logger,
 ) -> Result<Download, failure::Error> {
    // If `wasm-bindgen` is installed globally and it has the right version, use
    // that. Assume that other tools are installed next to it.
@ -34,12 +34,8 @@ pub fn install_wasm_bindgen(
    // This situation can arise if `wasm-bindgen` is already installed via
    // `cargo install`, for example.
    if let Ok(path) = which("wasm-bindgen") {
-        debug!(
-            log,
-            "found global wasm-bindgen binary at: {}",
-            path.display()
-        );
-        if wasm_bindgen_version_check(&path, version, log) {
+        debug!("found global wasm-bindgen binary at: {}", path.display());
+        if wasm_bindgen_version_check(&path, version) {
            return Ok(Download::at(path.parent().unwrap()));
        }
    }
@ -52,14 +48,13 @@ pub fn install_wasm_bindgen(
        Ok(dl) => return Ok(dl),
        Err(e) => {
            warn!(
-                log,
                "could not download pre-built `wasm-bindgen`: {}. Falling back to `cargo install`.",
                e
            );
        }
    }

-    cargo_install_wasm_bindgen(log, &cache, version, install_permitted)
+    cargo_install_wasm_bindgen(&cache, version, install_permitted)
 }

 /// Downloads a precompiled copy of wasm-bindgen, if available.
@ -102,7 +97,6 @@ fn prebuilt_url(version: &str) -> Option<String> {
 /// Use `cargo install` to install the `wasm-bindgen` CLI locally into the given
 /// crate.
 pub fn cargo_install_wasm_bindgen(
-    logger: &Logger,
    cache: &Cache,
    version: &str,
    install_permitted: bool,
@ -132,7 +126,7 @@ pub fn cargo_install_wasm_bindgen(
        .arg("--root")
        .arg(&tmp);

-    child::run(logger, cmd, "cargo install").context("Installing wasm-bindgen with cargo")?;
+    child::run(cmd, "cargo install").context("Installing wasm-bindgen with cargo")?;

    fs::rename(&tmp, &destination)?;
    Ok(Download::at(&destination))
@ -148,7 +142,6 @@ pub fn wasm_bindgen_build(
    target: &str,
    profile: BuildProfile,
    step: &Step,
-    log: &Logger,
 ) -> Result<(), failure::Error> {
    let msg = format!("{}Running WASM-bindgen...", emoji::RUNNER);
    PBAR.step(step, &msg);
@ -196,15 +189,15 @@ pub fn wasm_bindgen_build(
        cmd.arg("--keep-debug");
    }

-    child::run(log, cmd, "wasm-bindgen").context("Running the wasm-bindgen CLI")?;
+    child::run(cmd, "wasm-bindgen").context("Running the wasm-bindgen CLI")?;
    Ok(())
 }

 /// Check if the `wasm-bindgen` dependency is locally satisfied.
-fn wasm_bindgen_version_check(bindgen_path: &PathBuf, dep_version: &str, log: &Logger) -> bool {
+fn wasm_bindgen_version_check(bindgen_path: &PathBuf, dep_version: &str) -> bool {
    let mut cmd = Command::new(bindgen_path);
    cmd.arg("--version");
-    child::run(log, cmd, "wasm-bindgen")
+    child::run(cmd, "wasm-bindgen")
        .map(|stdout| {
            stdout
                .trim()
@ -212,10 +205,8 @@ fn wasm_bindgen_version_check(bindgen_path: &PathBuf, dep_version: &str, log: &L
                .nth(1)
                .map(|v| {
                    info!(
-                        log,
                        "Checking installed `wasm-bindgen` version == expected version: {} == {}",
-                        v,
-                        dep_version
+                        v, dep_version
                    );
                    v == dep_version
                })
--- a/src/build.rs
+++ b/src/build.rs
@ -5,7 +5,6 @@ use command::build::BuildProfile;
 use emoji;
 use failure::{Error, ResultExt};
 use progressbar::Step;
-use slog::Logger;
 use std::path::Path;
 use std::process::Command;
 use std::str;
@ -52,19 +51,17 @@ fn rustc_minor_version() -> Option<u32> {

 /// Ensure that `rustup` has the `wasm32-unknown-unknown` target installed for
 /// current toolchain
-pub fn rustup_add_wasm_target(log: &Logger, step: &Step) -> Result<(), Error> {
+pub fn rustup_add_wasm_target(step: &Step) -> Result<(), Error> {
    let msg = format!("{}Adding WASM target...", emoji::TARGET);
    PBAR.step(step, &msg);
    let mut cmd = Command::new("rustup");
    cmd.arg("target").arg("add").arg("wasm32-unknown-unknown");
-    child::run(log, cmd, "rustup")
-        .context("Adding the wasm32-unknown-unknown target with rustup")?;
+    child::run(cmd, "rustup").context("Adding the wasm32-unknown-unknown target with rustup")?;
    Ok(())
 }

 /// Run `cargo build` targetting `wasm32-unknown-unknown`.
 pub fn cargo_build_wasm(
-    log: &Logger,
    path: &Path,
    profile: BuildProfile,
    step: &Step,
@ -93,18 +90,18 @@ pub fn cargo_build_wasm(
    }
    cmd.arg("--target").arg("wasm32-unknown-unknown");
    cmd.args(extra_options);
-    child::run(log, cmd, "cargo build").context("Compiling your crate to WebAssembly failed")?;
+    child::run(cmd, "cargo build").context("Compiling your crate to WebAssembly failed")?;
    Ok(())
 }

 /// Run `cargo build --tests` targetting `wasm32-unknown-unknown`.
-pub fn cargo_build_wasm_tests(log: &Logger, path: &Path, debug: bool) -> Result<(), Error> {
+pub fn cargo_build_wasm_tests(path: &Path, debug: bool) -> Result<(), Error> {
    let mut cmd = Command::new("cargo");
    cmd.current_dir(path).arg("build").arg("--tests");
    if !debug {
        cmd.arg("--release");
    }
    cmd.arg("--target").arg("wasm32-unknown-unknown");
-    child::run(log, cmd, "cargo build").context("Compilation of your program failed")?;
+    child::run(cmd, "cargo build").context("Compilation of your program failed")?;
    Ok(())
 }
--- a/src/child.rs
+++ b/src/child.rs
@ -4,10 +4,12 @@
 //! properly logged and their output is logged as well.

 use failure::Error;
-use slog::Logger;
+use log::info;
 use std::{
    io::{self, Read},
-    mem, process, string,
+    mem,
+    process::{Command, Stdio},
+    string,
    sync::mpsc,
    thread,
 };
@ -19,6 +21,22 @@ enum OutputFragment {
    Stderr(Vec<u8>),
 }

+/// Return a new Command object
+pub fn new_command(program: &str) -> Command {
+    // On Windows, initializes launching <program> as `cmd /c <program>`.
+    // Initializing only with `Command::new("npm")` will launch
+    //   `npm` with quotes, `"npm"`, causing a run-time error on Windows.
+    // See rustc: #42436, #42791, #44542
+
+    if cfg!(windows) {
+        let mut cmd = Command::new("cmd");
+        cmd.arg("/c").arg(program);
+        cmd
+    } else {
+        Command::new(program)
+    }
+}
+
 /// Read data from the give reader and send it as an `OutputFragment` over the
 /// given sender.
 fn read_and_send<R, F>(
@ -115,16 +133,12 @@ where
 }

 /// Run the given command and return its stdout.
-pub fn run(
-    logger: &Logger,
-    mut command: process::Command,
-    command_name: &str,
-) -> Result<String, Error> {
-    info!(logger, "Running {:?}", command);
+pub fn run(mut command: Command, command_name: &str) -> Result<String, Error> {
+    info!("Running {:?}", command);

    let mut child = command
-        .stdout(process::Stdio::piped())
-        .stderr(process::Stdio::piped())
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
        .spawn()?;

    let stdout = child.stdout.take().unwrap();
@ -144,11 +158,11 @@ pub fn run(
        thread::spawn(move || read_and_send(stderr, stderr_send, OutputFragment::Stderr));

    let mut stdout = OutputAccumulator::new(|line| {
-        info!(logger, "{} (stdout): {}", command_name, line);
+        info!("{} (stdout): {}", command_name, line);
        PBAR.message(line)
    });
    let mut stderr = OutputAccumulator::new(|line| {
-        info!(logger, "{} (stderr): {}", command_name, line);
+        info!("{} (stderr): {}", command_name, line);
        PBAR.message(line)
    });

--- a/src/command/build.rs
+++ b/src/command/build.rs
@ -8,10 +8,10 @@ use failure::Error;
 use indicatif::HumanDuration;
 use license;
 use lockfile::Lockfile;
+use log::info;
 use manifest;
 use progressbar::Step;
 use readme;
-use slog::Logger;
 use std::path::PathBuf;
 use std::str::FromStr;
 use std::time::Instant;
@ -145,7 +145,7 @@ impl Default for BuildOptions {
    }
 }

-type BuildStep = fn(&mut Build, &Step, &Logger) -> Result<(), Error>;
+type BuildStep = fn(&mut Build, &Step) -> Result<(), Error>;

 impl Build {
    /// Construct a build command from the given options.
@ -191,7 +191,7 @@ impl Build {
    }

    /// Execute this `Build` command.
-    pub fn run(&mut self, log: &Logger) -> Result<(), Error> {
+    pub fn run(&mut self) -> Result<(), Error> {
        let process_steps = Build::get_process_steps(&self.mode);

        let mut step_counter = Step::new(process_steps.len());
@ -199,14 +199,13 @@ impl Build {
        let started = Instant::now();

        for (_, process_step) in process_steps {
-            process_step(self, &step_counter, log)?;
+            process_step(self, &step_counter)?;
            step_counter.inc();
        }

        let duration = HumanDuration(started.elapsed());
-        info!(&log, "Done in {}.", &duration);
+        info!("Done in {}.", &duration);
        info!(
-            &log,
            "Your wasm pkg is ready to publish at {}.",
            self.out_dir.display()
        );
@ -266,40 +265,33 @@ impl Build {
        }
    }

-    fn step_check_rustc_version(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Checking rustc version...");
+    fn step_check_rustc_version(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Checking rustc version...");
        let version = build::check_rustc_version(step)?;
        let msg = format!("rustc version is {}.", version);
-        info!(&log, "{}", &msg);
+        info!("{}", &msg);
        Ok(())
    }

-    fn step_check_crate_config(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Checking crate configuration...");
+    fn step_check_crate_config(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Checking crate configuration...");
        self.crate_data.check_crate_config(step)?;
-        info!(&log, "Crate is correctly configured.");
+        info!("Crate is correctly configured.");
        Ok(())
    }

-    fn step_add_wasm_target(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Adding wasm-target...");
-        build::rustup_add_wasm_target(log, step)?;
-        info!(&log, "Adding wasm-target was successful.");
+    fn step_add_wasm_target(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Adding wasm-target...");
+        build::rustup_add_wasm_target(step)?;
+        info!("Adding wasm-target was successful.");
        Ok(())
    }

-    fn step_build_wasm(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Building wasm...");
-        build::cargo_build_wasm(
-            log,
-            &self.crate_path,
-            self.profile,
-            step,
-            &self.extra_options,
-        )?;
+    fn step_build_wasm(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Building wasm...");
+        build::cargo_build_wasm(&self.crate_path, self.profile, step, &self.extra_options)?;

        info!(
-            &log,
            "wasm built at {:#?}.",
            &self
                .crate_path
@ -310,15 +302,15 @@ impl Build {
        Ok(())
    }

-    fn step_create_dir(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Creating a pkg directory...");
+    fn step_create_dir(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Creating a pkg directory...");
        create_pkg_dir(&self.out_dir, step)?;
-        info!(&log, "Created a pkg directory at {:#?}.", &self.crate_path);
+        info!("Created a pkg directory at {:#?}.", &self.crate_path);
        Ok(())
    }

-    fn step_create_json(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Writing a package.json...");
+    fn step_create_json(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Writing a package.json...");
        self.crate_data.write_package_json(
            &self.out_dir,
            &self.scope,
@ -327,55 +319,45 @@ impl Build {
            step,
        )?;
        info!(
-            &log,
            "Wrote a package.json at {:#?}.",
            &self.out_dir.join("package.json")
        );
        Ok(())
    }

-    fn step_copy_readme(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Copying readme from crate...");
+    fn step_copy_readme(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Copying readme from crate...");
        readme::copy_from_crate(&self.crate_path, &self.out_dir, step)?;
-        info!(&log, "Copied readme from crate to {:#?}.", &self.out_dir);
+        info!("Copied readme from crate to {:#?}.", &self.out_dir);
        Ok(())
    }

-    fn step_copy_license(&mut self, step: &Step, log: &Logger) -> Result<(), failure::Error> {
-        info!(&log, "Copying license from crate...");
+    fn step_copy_license(&mut self, step: &Step) -> Result<(), failure::Error> {
+        info!("Copying license from crate...");
        license::copy_from_crate(&self.crate_data, &self.crate_path, &self.out_dir, step)?;
-        info!(&log, "Copied license from crate to {:#?}.", &self.out_dir);
+        info!("Copied license from crate to {:#?}.", &self.out_dir);
        Ok(())
    }

-    fn step_install_wasm_bindgen(
-        &mut self,
-        step: &Step,
-        log: &Logger,
-    ) -> Result<(), failure::Error> {
-        info!(&log, "Identifying wasm-bindgen dependency...");
+    fn step_install_wasm_bindgen(&mut self, step: &Step) -> Result<(), failure::Error> {
+        info!("Identifying wasm-bindgen dependency...");
        let lockfile = Lockfile::new(&self.crate_data)?;
        let bindgen_version = lockfile.require_wasm_bindgen()?;
-        info!(&log, "Installing wasm-bindgen-cli...");
+        info!("Installing wasm-bindgen-cli...");
        let install_permitted = match self.mode {
            BuildMode::Normal => true,
            BuildMode::Force => true,
            BuildMode::Noinstall => false,
        };
-        let bindgen = bindgen::install_wasm_bindgen(
-            &self.cache,
-            &bindgen_version,
-            install_permitted,
-            step,
-            log,
-        )?;
+        let bindgen =
+            bindgen::install_wasm_bindgen(&self.cache, &bindgen_version, install_permitted, step)?;
        self.bindgen = Some(bindgen);
-        info!(&log, "Installing wasm-bindgen-cli was successful.");
+        info!("Installing wasm-bindgen-cli was successful.");
        Ok(())
    }

-    fn step_run_wasm_bindgen(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Building the wasm bindings...");
+    fn step_run_wasm_bindgen(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Building the wasm bindings...");
        bindgen::wasm_bindgen_build(
            &self.crate_data,
            self.bindgen.as_ref().unwrap(),
@ -384,9 +366,8 @@ impl Build {
            &self.target,
            self.profile,
            step,
-            log,
        )?;
-        info!(&log, "wasm bindings were built at {:#?}.", &self.out_dir);
+        info!("wasm bindings were built at {:#?}.", &self.out_dir);
        Ok(())
    }
 }
--- a/src/command/login.rs
+++ b/src/command/login.rs
@ -1,5 +1,5 @@
+use log::info;
 use npm;
-use slog::Logger;
 use std::result;
 use PBAR;

@ -8,22 +8,17 @@ pub fn login(
    scope: Option<String>,
    always_auth: bool,
    auth_type: Option<String>,
-    log: &Logger,
 ) -> result::Result<(), failure::Error> {
    let registry = registry.unwrap_or(npm::DEFAULT_NPM_REGISTRY.to_string());

-    info!(&log, "Logging in to npm...");
+    info!("Logging in to npm...");
    info!(
-        &log,
        "Scope: {:?} Registry: {}, Always Auth: {}, Auth Type: {:?}.",
-        &scope,
-        &registry,
-        always_auth,
-        &auth_type
+        &scope, &registry, always_auth, &auth_type
    );
-    info!(&log, "npm info located in the npm debug log");
-    npm::npm_login(log, &registry, &scope, always_auth, &auth_type)?;
-    info!(&log, "Logged you in!");
+    info!("npm info located in the npm debug log");
+    npm::npm_login(&registry, &scope, always_auth, &auth_type)?;
+    info!("Logged you in!");

    PBAR.message(&format!("👋  logged you in!"));
    Ok(())
--- a/src/command/mod.rs
+++ b/src/command/mod.rs
@ -14,7 +14,7 @@ use self::pack::pack;
 use self::publish::{access::Access, publish};
 use self::test::{Test, TestOptions};
 use failure::Error;
-use slog::Logger;
+use log::info;
 use std::path::PathBuf;
 use std::result;

@ -87,27 +87,27 @@ pub enum Command {
 }

 /// Run a command with the given logger!
-pub fn run_wasm_pack(command: Command, log: &Logger) -> result::Result<(), Error> {
+pub fn run_wasm_pack(command: Command) -> result::Result<(), Error> {
    // Run the correct command based off input and store the result of it so that we can clear
    // the progress bar then return it
    let status = match command {
        Command::Build(build_opts) => {
-            info!(&log, "Running build command...");
-            Build::try_from_opts(build_opts).and_then(|mut b| b.run(&log))
+            info!("Running build command...");
+            Build::try_from_opts(build_opts).and_then(|mut b| b.run())
        }
        Command::Pack { path } => {
-            info!(&log, "Running pack command...");
-            info!(&log, "Path: {:?}", &path);
-            pack(path, &log)
+            info!("Running pack command...");
+            info!("Path: {:?}", &path);
+            pack(path)
        }
        Command::Publish {
            target,
            path,
            access,
        } => {
-            info!(&log, "Running publish command...");
-            info!(&log, "Path: {:?}", &path);
-            publish(target, path, access, &log)
+            info!("Running publish command...");
+            info!("Path: {:?}", &path);
+            publish(target, path, access)
        }
        Command::Login {
            registry,
@ -115,20 +115,16 @@ pub fn run_wasm_pack(command: Command, log: &Logger) -> result::Result<(), Error
            always_auth,
            auth_type,
        } => {
-            info!(&log, "Running login command...");
+            info!("Running login command...");
            info!(
-                &log,
                "Registry: {:?}, Scope: {:?}, Always Auth: {}, Auth Type: {:?}",
-                &registry,
-                &scope,
-                &always_auth,
-                &auth_type
+                &registry, &scope, &always_auth, &auth_type
            );
-            login(registry, scope, always_auth, auth_type, &log)
+            login(registry, scope, always_auth, auth_type)
        }
        Command::Test(test_opts) => {
-            info!(&log, "Running test command...");
-            Test::try_from_opts(test_opts).and_then(|t| t.run(&log))
+            info!("Running test command...");
+            Test::try_from_opts(test_opts).and_then(|t| t.run())
        }
    };

--- a/src/command/pack.rs
+++ b/src/command/pack.rs
@ -1,17 +1,17 @@
 use command::utils::{find_pkg_directory, set_crate_path};
 use failure::Error;
+use log::info;
 use npm;
-use slog::Logger;
 use std::path::PathBuf;
 use std::result;
 use PBAR;

 /// Executes the 'npm pack' command on the 'pkg' directory
 /// which creates a tarball that can be published to the NPM registry
-pub fn pack(path: Option<PathBuf>, log: &Logger) -> result::Result<(), Error> {
+pub fn pack(path: Option<PathBuf>) -> result::Result<(), Error> {
    let crate_path = set_crate_path(path)?;

-    info!(&log, "Packing up the npm package...");
+    info!("Packing up the npm package...");
    let pkg_directory = find_pkg_directory(&crate_path).ok_or_else(|| {
        format_err!(
            "Unable to find the pkg directory at path {:#?}, or in a child directory of {:#?}",
@ -19,12 +19,8 @@ pub fn pack(path: Option<PathBuf>, log: &Logger) -> result::Result<(), Error> {
            &crate_path
        )
    })?;
-    npm::npm_pack(log, &pkg_directory.to_string_lossy())?;
-    info!(
-        &log,
-        "Your package is located at {:#?}",
-        crate_path.join("pkg")
-    );
+    npm::npm_pack(&pkg_directory.to_string_lossy())?;
+    info!("Your package is located at {:#?}", crate_path.join("pkg"));

    PBAR.message("🎒  packed up your package!");
    Ok(())
--- a/src/command/publish/mod.rs
+++ b/src/command/publish/mod.rs
@ -6,8 +6,8 @@ use command::build::{Build, BuildOptions};
 use command::utils::{find_pkg_directory, set_crate_path};
 use dialoguer::{Confirmation, Input, Select};
 use failure::Error;
+use log::info;
 use npm;
-use slog::Logger;
 use std::path::PathBuf;
 use std::result;
 use PBAR;
@ -18,12 +18,11 @@ pub fn publish(
    _target: String,
    path: Option<PathBuf>,
    access: Option<Access>,
-    log: &Logger,
 ) -> result::Result<(), Error> {
    let crate_path = set_crate_path(path)?;

-    info!(&log, "Publishing the npm package...");
-    info!(&log, "npm info located in the npm debug log");
+    info!("Publishing the npm package...");
+    info!("npm info located in the npm debug log");

    let pkg_directory = match find_pkg_directory(&crate_path) {
        Some(path) => Ok(path),
@ -53,7 +52,7 @@ pub fn publish(
                    ..Default::default()
                };
                Build::try_from_opts(build_opts)
-                    .and_then(|mut build| build.run(&log))
+                    .and_then(|mut build| build.run())
                    .map(|()| crate_path.join(out_dir))
                    .map_err(|_| {
                        format_err!(
@ -73,8 +72,8 @@ pub fn publish(
            }
        }
    }?;
-    npm::npm_publish(log, &pkg_directory.to_string_lossy(), access)?;
-    info!(&log, "Published your package!");
+    npm::npm_publish(&pkg_directory.to_string_lossy(), access)?;
+    info!("Published your package!");

    PBAR.message("💥  published your package!");
    Ok(())
--- a/src/command/test.rs
+++ b/src/command/test.rs
@ -9,9 +9,9 @@ use emoji;
 use failure::Error;
 use indicatif::HumanDuration;
 use lockfile::Lockfile;
+use log::info;
 use manifest;
 use progressbar::Step;
-use slog::Logger;
 use std::path::PathBuf;
 use std::time::Instant;
 use test::{self, webdriver};
@ -97,7 +97,7 @@ pub struct Test {
    test_runner_path: Option<PathBuf>,
 }

-type TestStep = fn(&mut Test, &Step, &Logger) -> Result<(), Error>;
+type TestStep = fn(&mut Test, &Step) -> Result<(), Error>;

 impl Test {
    /// Construct a test command from the given options.
@ -155,17 +155,17 @@ impl Test {
    }

    /// Execute this test command.
-    pub fn run(mut self, log: &Logger) -> Result<(), Error> {
+    pub fn run(mut self) -> Result<(), Error> {
        let process_steps = self.get_process_steps();
        let mut step_counter = Step::new(process_steps.len());

        let started = Instant::now();
        for (_, process_step) in process_steps {
-            process_step(&mut self, &step_counter, log)?;
+            process_step(&mut self, &step_counter)?;
            step_counter.inc();
        }
        let duration = HumanDuration(started.elapsed());
-        info!(&log, "Done in {}.", &duration);
+        info!("Done in {}.", &duration);

        Ok(())
    }
@ -225,34 +225,34 @@ impl Test {
        }
    }

-    fn step_check_rustc_version(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(log, "Checking rustc version...");
+    fn step_check_rustc_version(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Checking rustc version...");
        let _ = build::check_rustc_version(step)?;
-        info!(log, "Rustc version is correct.");
+        info!("Rustc version is correct.");
        Ok(())
    }

-    fn step_add_wasm_target(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Adding wasm-target...");
-        build::rustup_add_wasm_target(log, step)?;
-        info!(&log, "Adding wasm-target was successful.");
+    fn step_add_wasm_target(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Adding wasm-target...");
+        build::rustup_add_wasm_target(step)?;
+        info!("Adding wasm-target was successful.");
        Ok(())
    }

-    fn step_build_tests(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(log, "Compiling tests to wasm...");
+    fn step_build_tests(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Compiling tests to wasm...");

        let msg = format!("{}Compiling tests to WASM...", emoji::CYCLONE);
        PBAR.step(step, &msg);

-        build::cargo_build_wasm_tests(log, &self.crate_path, !self.release)?;
+        build::cargo_build_wasm_tests(&self.crate_path, !self.release)?;

-        info!(log, "Finished compiling tests to wasm.");
+        info!("Finished compiling tests to wasm.");
        Ok(())
    }

-    fn step_install_wasm_bindgen(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Identifying wasm-bindgen dependency...");
+    fn step_install_wasm_bindgen(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Identifying wasm-bindgen dependency...");
        let lockfile = Lockfile::new(&self.crate_data)?;
        let bindgen_version = lockfile.require_wasm_bindgen()?;

@ -272,51 +272,45 @@ impl Test {

        let install_permitted = match self.mode {
            BuildMode::Normal => {
-                info!(&log, "Ensuring wasm-bindgen-cli is installed...");
+                info!("Ensuring wasm-bindgen-cli is installed...");
                true
            }
            BuildMode::Force => {
-                info!(&log, "Ensuring wasm-bindgen-cli is installed...");
+                info!("Ensuring wasm-bindgen-cli is installed...");
                true
            }
            BuildMode::Noinstall => {
-                info!(&log, "Searching for existing wasm-bindgen-cli install...");
+                info!("Searching for existing wasm-bindgen-cli install...");
                false
            }
        };

-        let dl = bindgen::install_wasm_bindgen(
-            &self.cache,
-            &bindgen_version,
-            install_permitted,
-            step,
-            log,
-        )?;
+        let dl =
+            bindgen::install_wasm_bindgen(&self.cache, &bindgen_version, install_permitted, step)?;

        self.test_runner_path = Some(dl.binary("wasm-bindgen-test-runner"));

-        info!(&log, "Getting wasm-bindgen-cli was successful.");
+        info!("Getting wasm-bindgen-cli was successful.");
        Ok(())
    }

-    fn step_test_node(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
+    fn step_test_node(&mut self, step: &Step) -> Result<(), Error> {
        assert!(self.node);
-        info!(log, "Running tests in node...");
+        info!("Running tests in node...");
        PBAR.step(step, "Running tests in node...");
        test::cargo_test_wasm(
            &self.crate_path,
            self.release,
-            log,
            Some((
                "CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_RUNNER",
                &self.test_runner_path.as_ref().unwrap(),
            )),
        )?;
-        info!(log, "Finished running tests in node.");
+        info!("Finished running tests in node.");
        Ok(())
    }

-    fn step_get_chromedriver(&mut self, step: &Step, _log: &Logger) -> Result<(), Error> {
+    fn step_get_chromedriver(&mut self, step: &Step) -> Result<(), Error> {
        PBAR.step(step, "Getting chromedriver...");
        assert!(self.chrome && self.chromedriver.is_none());

@ -327,14 +321,14 @@ impl Test {
        Ok(())
    }

-    fn step_test_chrome(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
+    fn step_test_chrome(&mut self, step: &Step) -> Result<(), Error> {
        PBAR.step(step, "Running tests in Chrome...");

        let chromedriver = self.chromedriver.as_ref().unwrap().display().to_string();
        let chromedriver = chromedriver.as_str();
        info!(
-            log,
-            "Running tests in Chrome with chromedriver at {}", chromedriver
+            "Running tests in Chrome with chromedriver at {}",
+            chromedriver
        );

        let test_runner = self
@ -344,7 +338,7 @@ impl Test {
            .display()
            .to_string();
        let test_runner = test_runner.as_str();
-        info!(log, "Using wasm-bindgen test runner at {}", test_runner);
+        info!("Using wasm-bindgen test runner at {}", test_runner);

        let mut envs = vec![
            ("CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_RUNNER", test_runner),
@ -354,11 +348,11 @@ impl Test {
            envs.push(("NO_HEADLESS", "1"));
        }

-        test::cargo_test_wasm(&self.crate_path, self.release, log, envs)?;
+        test::cargo_test_wasm(&self.crate_path, self.release, envs)?;
        Ok(())
    }

-    fn step_get_geckodriver(&mut self, step: &Step, _log: &Logger) -> Result<(), Error> {
+    fn step_get_geckodriver(&mut self, step: &Step) -> Result<(), Error> {
        PBAR.step(step, "Getting geckodriver...");
        assert!(self.firefox && self.geckodriver.is_none());

@ -369,14 +363,14 @@ impl Test {
        Ok(())
    }

-    fn step_test_firefox(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
+    fn step_test_firefox(&mut self, step: &Step) -> Result<(), Error> {
        PBAR.step(step, "Running tests in Firefox...");

        let geckodriver = self.geckodriver.as_ref().unwrap().display().to_string();
        let geckodriver = geckodriver.as_str();
        info!(
-            log,
-            "Running tests in Firefox with geckodriver at {}", geckodriver
+            "Running tests in Firefox with geckodriver at {}",
+            geckodriver
        );

        let test_runner = self
@ -386,7 +380,7 @@ impl Test {
            .display()
            .to_string();
        let test_runner = test_runner.as_str();
-        info!(log, "Using wasm-bindgen test runner at {}", test_runner);
+        info!("Using wasm-bindgen test runner at {}", test_runner);

        let mut envs = vec![
            ("CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_RUNNER", test_runner),
@ -396,11 +390,11 @@ impl Test {
            envs.push(("NO_HEADLESS", "1"));
        }

-        test::cargo_test_wasm(&self.crate_path, self.release, log, envs)?;
+        test::cargo_test_wasm(&self.crate_path, self.release, envs)?;
        Ok(())
    }

-    fn step_get_safaridriver(&mut self, step: &Step, _log: &Logger) -> Result<(), Error> {
+    fn step_get_safaridriver(&mut self, step: &Step) -> Result<(), Error> {
        PBAR.step(step, "Getting safaridriver...");
        assert!(self.safari && self.safaridriver.is_none());

@ -408,14 +402,14 @@ impl Test {
        Ok(())
    }

-    fn step_test_safari(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
+    fn step_test_safari(&mut self, step: &Step) -> Result<(), Error> {
        PBAR.step(step, "Running tests in Safari...");

        let safaridriver = self.safaridriver.as_ref().unwrap().display().to_string();
        let safaridriver = safaridriver.as_str();
        info!(
-            log,
-            "Running tests in Safari with safaridriver at {}", safaridriver
+            "Running tests in Safari with safaridriver at {}",
+            safaridriver
        );

        let test_runner = self
@ -425,7 +419,7 @@ impl Test {
            .display()
            .to_string();
        let test_runner = test_runner.as_str();
-        info!(log, "Using wasm-bindgen test runner at {}", test_runner);
+        info!("Using wasm-bindgen test runner at {}", test_runner);

        let mut envs = vec![
            ("CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_RUNNER", test_runner),
@ -435,7 +429,7 @@ impl Test {
            envs.push(("NO_HEADLESS", "1"));
        }

-        test::cargo_test_wasm(&self.crate_path, self.release, log, envs)?;
+        test::cargo_test_wasm(&self.crate_path, self.release, envs)?;
        Ok(())
    }
 }
--- a/src/lib.rs
+++ b/src/lib.rs
@ -20,11 +20,8 @@ extern crate serde_ignored;
 extern crate serde_json;
 #[macro_use]
 extern crate structopt;
-#[macro_use]
-extern crate slog;
 extern crate dialoguer;
-extern crate slog_async;
-extern crate slog_term;
+extern crate log;
 extern crate toml;
 extern crate walkdir;
 extern crate wasm_pack_binary_install;
@ -36,7 +33,6 @@ pub mod command;
 pub mod emoji;
 pub mod license;
 pub mod lockfile;
-pub mod logger;
 pub mod manifest;
 pub mod npm;
 pub mod progressbar;
--- a/src/logger.rs
+++ b/src/logger.rs
@ -1,76 +0,0 @@
-//! Logging facilities for `wasm-pack`.
-
-use command::Command;
-use failure;
-use slog::{Drain, Level, Logger};
-use slog_async::Async;
-use slog_term::{FullFormat, PlainDecorator};
-use std::fs::OpenOptions;
-use std::path::PathBuf;
-
-/// Create the logger for wasm-pack that will output any info warning or errors we encounter
-pub fn new(cmd: &Command, verbosity: u8) -> Result<Logger, failure::Error> {
-    let log_path = log_file_path(&cmd);
-    let file = OpenOptions::new()
-        .create(true)
-        .append(true)
-        .open(log_path)?;
-
-    let decorator = PlainDecorator::new(file);
-    let drain = FullFormat::new(decorator).build().fuse();
-
-    // Set the log level based off the number of v passed in to the command line args.
-    // Level level means only messages of that level and higher are logged. If we have
-    // an error then we'll log it unconditionally, but extra levels are only available
-    // with extra v
-    let log_level = match verbosity {
-        0 => Level::Error,
-        1 => Level::Info,
-        2 => Level::Debug,
-        _ => Level::Trace,
-    };
-    let drain = Async::new(drain).build().filter_level(log_level).fuse();
-    Ok(Logger::root(drain, o!()))
-}
-
-/// Figure out where to stick the log based off the command arguments given
-fn log_file_path(cmd: &Command) -> PathBuf {
-    let path = match cmd {
-        Command::Build(build_opts) => &build_opts.path,
-        Command::Pack { path } => path,
-        Command::Publish {
-            target: _,
-            path,
-            access: _,
-        } => path,
-        Command::Test(test_opts) => &test_opts.path,
-        Command::Login { .. } => &None,
-    };
-
-    // If the path exists attempt to use it, if not default to the current directory
-    if let Some(ref path) = path {
-        let mut path_buf = PathBuf::from(path);
-        path_buf.push("Cargo.toml");
-
-        // If the manifest file exists put the log in that directory otherwise default
-        // to the current directory.
-        if path_buf.exists() {
-            path_buf.pop();
-            path_buf.push("wasm-pack.log");
-            path_buf
-        } else {
-            let mut path_buf = this_dir();
-            path_buf.push("wasm-pack.log");
-            path_buf
-        }
-    } else {
-        let mut path_buf = this_dir();
-        path_buf.push("wasm-pack.log");
-        path_buf
-    }
-}
-
-/// Return a `PathBuf` for the current directory
-fn this_dir() -> PathBuf {
-    PathBuf::from(".")
-}
--- a/src/main.rs
+++ b/src/main.rs
@ -1,4 +1,5 @@
 extern crate atty;
+extern crate env_logger;
 #[macro_use]
 extern crate failure;
 #[macro_use]
@ -9,11 +10,12 @@ extern crate which;

 use std::env;
 use structopt::StructOpt;
-use wasm_pack::{command::run_wasm_pack, logger, Cli};
+use wasm_pack::{command::run_wasm_pack, Cli};

 mod installer;

 fn main() {
+    env_logger::init();
    setup_panic!();
    if let Err(e) = run() {
        eprintln!("Error: {}", e);
@ -39,7 +41,6 @@ fn run() -> Result<(), failure::Error> {
    }

    let args = Cli::from_args();
-    let log = logger::new(&args.cmd, args.verbosity)?;
-    run_wasm_pack(args.cmd, &log)?;
+    run_wasm_pack(args.cmd)?;
    Ok(())
 }
--- a/src/npm.rs
+++ b/src/npm.rs
@ -3,44 +3,36 @@
 use child;
 use command::publish::access::Access;
 use failure::{self, ResultExt};
-use slog::Logger;
-use std::process::{Command, Stdio};
+use log::info;

 /// The default npm registry used when we aren't working with a custom registry.
 pub const DEFAULT_NPM_REGISTRY: &'static str = "https://registry.npmjs.org/";

 /// Run the `npm pack` command.
-pub fn npm_pack(log: &Logger, path: &str) -> Result<(), failure::Error> {
-    let mut cmd = Command::new("npm");
+pub fn npm_pack(path: &str) -> Result<(), failure::Error> {
+    let mut cmd = child::new_command("npm");
    cmd.current_dir(path).arg("pack");
-    child::run(log, cmd, "npm pack").context("Packaging up your code failed")?;
+    child::run(cmd, "npm pack").context("Packaging up your code failed")?;
    Ok(())
 }

 /// Run the `npm publish` command.
-pub fn npm_publish(log: &Logger, path: &str, access: Option<Access>) -> Result<(), failure::Error> {
-    let mut cmd = Command::new("npm");
+pub fn npm_publish(path: &str, access: Option<Access>) -> Result<(), failure::Error> {
+    let mut cmd = child::new_command("npm");
    match access {
        Some(a) => cmd
            .current_dir(path)
            .arg("publish")
-            .arg(&format!("{}", a.to_string()))
-            .stdin(Stdio::inherit())
-            .stdout(Stdio::inherit()),
-        None => cmd
-            .current_dir(path)
-            .arg("publish")
-            .stdin(Stdio::inherit())
-            .stdout(Stdio::inherit()),
+            .arg(&format!("{}", a.to_string())),
+        None => cmd.current_dir(path).arg("publish"),
    };

-    child::run(log, cmd, "npm publish").context("Publishing to npm failed")?;
+    child::run(cmd, "npm publish").context("Publishing to npm failed")?;
    Ok(())
 }

 /// Run the `npm login` command.
 pub fn npm_login(
-    log: &Logger,
    registry: &String,
    scope: &Option<String>,
    always_auth: bool,
@ -52,7 +44,7 @@ pub fn npm_login(
        args.push(format!("--scope={}", scope));
    }

-    if always_auth == true {
+    if always_auth {
        args.push(format!("--always_auth"));
    }

@ -62,10 +54,10 @@ pub fn npm_login(

    // Interactively ask user for npm login info.
    //  (child::run does not support interactive input)
-    let mut cmd = Command::new("npm");
+    let mut cmd = child::new_command("npm");
    cmd.args(args);

-    info!(log, "Running {:?}", cmd);
+    info!("Running {:?}", cmd);
    match cmd.status()?.success() {
        true => Ok(()),
        false => bail!("Login to registry {} failed", registry),
--- a/src/test/mod.rs
+++ b/src/test/mod.rs
@ -4,19 +4,14 @@ pub mod webdriver;

 use child;
 use failure::{self, ResultExt};
-use slog::Logger;
+use log::info;
 use std::ffi::OsStr;
 use std::path::Path;
 use std::process::Command;

 /// Run `cargo test` with the `nightly` toolchain and targeting
 /// `wasm32-unknown-unknown`.
-pub fn cargo_test_wasm<I, K, V>(
-    path: &Path,
-    release: bool,
-    log: &Logger,
-    envs: I,
-) -> Result<(), failure::Error>
+pub fn cargo_test_wasm<I, K, V>(path: &Path, release: bool, envs: I) -> Result<(), failure::Error>
 where
    I: IntoIterator<Item = (K, V)>,
    K: AsRef<OsStr>,
@ -30,12 +25,11 @@ where
            cmd.arg("--release");
        }
        cmd.arg("--target").arg("wasm32-unknown-unknown");
-        child::run(log, cmd, "cargo test")
-            .context("Running Wasm tests with wasm-bindgen-test failed")?
+        child::run(cmd, "cargo test").context("Running Wasm tests with wasm-bindgen-test failed")?
    };

    for line in output.lines() {
-        info!(log, "test output: {}", line);
+        info!("test output: {}", line);
        println!("{}", line);
    }
    Ok(())
--- a/tests/all/build.rs
+++ b/tests/all/build.rs
@ -229,26 +229,6 @@ fn build_with_and_without_wasm_bindgen_debug() {
    }
 }

-#[cfg(target_os = "windows")]
-#[test]
-fn it_format_out_dir_on_windows() {
-    let fixture = utils::fixture::js_hello_world();
-    fixture.install_local_wasm_bindgen();
-    let cli = Cli::from_iter_safe(vec![
-        "wasm-pack",
-        "build",
-        &fixture.path.display().to_string(),
-    ])
-    .unwrap();
-    fixture.run(cli.cmd).unwrap();
-
-    let wasm_pack_log = utils::file::read_file(&fixture.path.join("wasm-pack.log")).unwrap();
-    assert!(
-        wasm_pack_log.contains(r"Your wasm pkg is ready to publish at C:\"),
-        "directories in wasm-pack.log should be well formatted",
-    );
-}
-
 #[test]
 fn build_with_arbitrary_cargo_options() {
    let fixture = utils::fixture::js_hello_world();
--- a/tests/all/main.rs
+++ b/tests/all/main.rs
@ -4,8 +4,6 @@ extern crate lazy_static;
 #[macro_use]
 extern crate serde_derive;
 extern crate serde_json;
-#[macro_use]
-extern crate slog;
 extern crate structopt;
 extern crate tempfile;
 extern crate wasm_pack;
--- a/tests/all/utils/fixture.rs
+++ b/tests/all/utils/fixture.rs
@ -1,4 +1,3 @@
-use super::logger::null_logger;
 use std::env;
 use std::fs;
 use std::mem::ManuallyDrop;
@ -170,7 +169,6 @@ impl Fixture {
        static INSTALL_WASM_BINDGEN: Once = ONCE_INIT;
        let cache = self.cache();
        let version = "0.2.21";
-        let log = &null_logger();

        let download = || {
            if let Ok(download) =
@ -179,7 +177,7 @@ impl Fixture {
                return Ok(download);
            }

-            wasm_pack::bindgen::cargo_install_wasm_bindgen(log, &cache, version, true)
+            wasm_pack::bindgen::cargo_install_wasm_bindgen(&cache, version, true)
        };

        // Only one thread can perform the actual download, and then afterwards
@ -243,18 +241,17 @@ impl Fixture {
    }

    pub fn run(&self, cmd: wasm_pack::command::Command) -> Result<(), failure::Error> {
-        let logger = wasm_pack::logger::new(&cmd, 3)?;
        match cmd {
            wasm_pack::command::Command::Test(cmd) => {
                let _lock = self.lock();
                let mut test = wasm_pack::command::test::Test::try_from_opts(cmd)?;
                test.set_cache(self.cache());
-                test.run(&logger)
+                test.run()
            }
            wasm_pack::command::Command::Build(cmd) => {
                let mut build = wasm_pack::command::build::Build::try_from_opts(cmd)?;
                build.set_cache(self.cache());
-                build.run(&logger)
+                build.run()
            }
            _ => unreachable!(),
        }
--- a/tests/all/utils/logger.rs
+++ b/tests/all/utils/logger.rs
@ -1,6 +0,0 @@
-use slog::Logger;
-
-// Create a logger that ignores log messages for testing.
-pub fn null_logger() -> Logger {
-    Logger::root(slog::Discard, o!())
-}
--- a/tests/all/utils/mod.rs
+++ b/tests/all/utils/mod.rs
@ -1,4 +1,3 @@
 pub mod file;
 pub mod fixture;
-pub mod logger;
 pub mod manifest;