diff --git a/Cargo.lock b/Cargo.lock
index cc8a2f9..eb3fba5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -274,6 +274,16 @@ dependencies = [
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "dialoguer"
+version = "0.3.0"
+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 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "dirs"
 version = "1.0.4"
@@ -658,6 +668,16 @@ dependencies = [
  "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand"
+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)",
+]
+
 [[package]]
 name = "rand"
 version = "0.4.3"
@@ -843,6 +863,14 @@ name = "ryu"
 version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "same-file"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "schannel"
 version = "0.1.14"
@@ -1041,6 +1069,18 @@ dependencies = [
  "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tempfile"
+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)",
+ "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)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tempfile"
 version = "3.0.5"
@@ -1185,6 +1225,16 @@ name = "void"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "walkdir"
+version = "2.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "same-file 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "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 = "wasm-pack"
 version = "0.5.1"
@@ -1192,6 +1242,7 @@ dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "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)",
+ "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)",
  "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)",
@@ -1210,6 +1261,7 @@ dependencies = [
  "structopt 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-pack-binary-install 0.1.0",
  "which 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1261,6 +1313,14 @@ name = "winapi-i686-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "winapi-util"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
@@ -1325,6 +1385,7 @@ dependencies = [
 "checksum crc32fast 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e91d5240c6975ef33aeb5f148f35275c25eda8e8a5f95abe421978b05b8bf192"
 "checksum curl 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)" = "c7c9d851c825e0c033979d4516c9173bc19a78a96eb4d6ae51d4045440eafa16"
 "checksum curl-sys 0.4.15 (registry+https://github.com/rust-lang/crates.io-index)" = "721c204978be2143fab0a84b708c49d79d1f6100b8785610f456043a90708870"
+"checksum dialoguer 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1ad1c29a0368928e78c551354dbff79f103a962ad820519724ef0d74f1c62fa9"
 "checksum dirs 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "88972de891f6118092b643d85a0b28e0678e0f948d7f879aa32f2d5aafe97d2a"
 "checksum encode_unicode 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "90b2c9496c001e8cb61827acdefad780795c42264c137744cae6f7d9e3450abd"
 "checksum error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "07e791d3be96241c77c43846b665ef1384606da2cd2a48730abe606a12906e02"
@@ -1371,6 +1432,7 @@ dependencies = [
 "checksum podio 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "780fb4b6698bbf9cf2444ea5d22411cef2953f0824b98f33cf454ec5615645bd"
 "checksum proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)" = "77619697826f31a02ae974457af0b29b723e5619e113e9397b8b82c6bd253f09"
 "checksum quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)" = "53fa22a1994bd0f9372d7a816207d8a2677ad0325b073f5c5332760f0fb62b5c"
+"checksum rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)" = "15a732abf9d20f0ad8eeb6f909bf6868722d9a06e1e50802b6a70351f40b4eb1"
 "checksum rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "8356f47b32624fef5b3301c1be97e5944ecdd595409cc5da11d05f211db6cfbd"
 "checksum rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e464cd887e869cddcae8792a4ee31d23c7edd516700695608f5b98c67ee0131c"
 "checksum rand 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ae9d223d52ae411a33cf7e54ec6034ec165df296ccd23533d671a28252b6f66a"
@@ -1392,6 +1454,7 @@ dependencies = [
 "checksum rustc-demangle 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "01b90379b8664dd83460d59bdc5dd1fd3172b8913788db483ed1325171eab2f7"
 "checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
 "checksum ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "eb9e9b8cde282a9fe6a42dd4681319bfb63f121b8a8ee9439c6f4107e58a46f7"
+"checksum same-file 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8f20c4be53a8a1ff4c1f1b2bd14570d2f634628709752f0702ecdd2b3f9a5267"
 "checksum schannel 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)" = "0e1a231dc10abf6749cfa5d7767f25888d484201accbd919b66ab5413c502d56"
 "checksum scoped_threadpool 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "1d51f5df5af43ab3f1360b429fa5e0152ac5ce8c0bd6485cae490332e96846a8"
 "checksum scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "94258f53601af11e6a49f722422f6e3425c52b06245a5cf9bc09908b174f5e27"
@@ -1417,6 +1480,7 @@ dependencies = [
 "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"
 "checksum term 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5e6b677dd1e8214ea1ef4297f85dbcbed8e8cdddb561040cc998ca2551c37561"
 "checksum termcolor 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "adc4587ead41bf016f11af03e55a624c06568b5a19db4e90fde573d805074f83"
@@ -1437,11 +1501,13 @@ dependencies = [
 "checksum vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
 "checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
+"checksum walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "9d9d7ed3431229a144296213105a390676cc49c9b6a72bd19f3176c98e129fa1"
 "checksum which 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b57acb10231b9493c8472b20cb57317d0679a49e0bdbee44b3b803a6473af164"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "92c1eb33641e276cfa214a0522acad57be5c56b10cb348b3c5117db75f3ac4b0"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
 "checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+"checksum winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "afc5508759c5bf4285e61feb862b6083c8480aec864fa17a81fdec6f69b461ab"
 "checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 "checksum wincolor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "eeb06499a3a4d44302791052df005d5232b927ed1a9658146d842165c4de7767"
 "checksum xattr 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "244c3741f4240ef46274860397c7c74e50eb23624996930e484c16679633a54c"
diff --git a/Cargo.toml b/Cargo.toml
index dced6ff..dcf45e9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,6 +13,7 @@ documentation = "https://rustwasm.github.io/wasm-pack/"
 atty = "0.2.11"
 cargo_metadata = "0.6.0"
 console = "0.6.1"
+dialoguer = "0.3.0"
 failure = "0.1.2"
 human-panic = "1.0.1"
 glob = "0.2"
@@ -32,6 +33,7 @@ structopt = "0.2"
 toml = "0.4"
 which = "2.0.0"
 wasm-pack-binary-install = { version = "0.1.0", path = "./binary-install" }
+walkdir = "2"
 
 [dev-dependencies]
 tempfile = "3"
diff --git a/src/command/build.rs b/src/command/build.rs
index 075ddc2..0fbbff3 100644
--- a/src/command/build.rs
+++ b/src/command/build.rs
@@ -102,26 +102,43 @@ pub struct BuildOptions {
 
     #[structopt(long = "debug")]
     /// Deprecated. Renamed to `--dev`.
-    debug: bool,
+    pub debug: bool,
 
     #[structopt(long = "dev")]
     /// Create a development build. Enable debug info, and disable
     /// optimizations.
-    dev: bool,
+    pub dev: bool,
 
     #[structopt(long = "release")]
     /// Create a release build. Enable optimizations and disable debug info.
-    release: bool,
+    pub release: bool,
 
     #[structopt(long = "profiling")]
     /// Create a profiling build. Enable optimizations and debug info.
-    profiling: bool,
+    pub profiling: bool,
 
     #[structopt(long = "out-dir", short = "d", default_value = "pkg")]
     /// Sets the output directory with a relative path.
     pub out_dir: String,
 }
 
+impl Default for BuildOptions {
+    fn default() -> Self {
+        Self {
+            path: None,
+            scope: None,
+            mode: BuildMode::Normal,
+            disable_dts: false,
+            target: String::new(),
+            debug: false,
+            dev: false,
+            release: false,
+            profiling: false,
+            out_dir: String::new(),
+        }
+    }
+}
+
 type BuildStep = fn(&mut Build, &Step, &Logger) -> Result<(), Error>;
 
 impl Build {
@@ -177,15 +194,16 @@ impl Build {
         info!(&log, "Done in {}.", &duration);
         info!(
             &log,
-            "Your wasm pkg is ready to publish at {:#?}.", &self.out_dir
+            "Your wasm pkg is ready to publish at {}.",
+            self.out_dir.display()
         );
 
         PBAR.message(&format!("{} Done in {}", emoji::SPARKLE, &duration));
 
         PBAR.message(&format!(
-            "{} Your wasm pkg is ready to publish at {:#?}.",
+            "{} Your wasm pkg is ready to publish at {}.",
             emoji::PACKAGE,
-            self.out_dir.canonicalize().unwrap_or(self.out_dir.clone())
+            self.out_dir.display()
         ));
         Ok(())
     }
diff --git a/src/command/mod.rs b/src/command/mod.rs
index 0b186c0..06353ec 100644
--- a/src/command/mod.rs
+++ b/src/command/mod.rs
@@ -36,6 +36,10 @@ pub enum Command {
     #[structopt(name = "publish")]
     /// 🎆  pack up your npm package and publish!
     Publish {
+        #[structopt(long = "target", short = "t", default_value = "browser")]
+        /// Sets the target environment. [possible values: browser, nodejs, no-modules]
+        target: String,
+
         /// The access level for the package to be published
         #[structopt(long = "access", short = "a")]
         access: Option<Access>,
@@ -96,10 +100,14 @@ pub fn run_wasm_pack(command: Command, log: &Logger) -> result::Result<(), Error
             info!(&log, "Path: {:?}", &path);
             pack(path, &log)
         }
-        Command::Publish { path, access } => {
+        Command::Publish {
+            target,
+            path,
+            access,
+        } => {
             info!(&log, "Running publish command...");
             info!(&log, "Path: {:?}", &path);
-            publish(path, access, &log)
+            publish(target, path, access, &log)
         }
         Command::Login {
             registry,
diff --git a/src/command/publish/mod.rs b/src/command/publish/mod.rs
index 8b2c564..b2c0916 100644
--- a/src/command/publish/mod.rs
+++ b/src/command/publish/mod.rs
@@ -2,7 +2,9 @@
 pub mod access;
 
 use self::access::Access;
+use command::build::{Build, BuildOptions};
 use command::utils::{find_pkg_directory, set_crate_path};
+use dialoguer::{Confirmation, Input, Select};
 use failure::Error;
 use npm;
 use slog::Logger;
@@ -13,6 +15,7 @@ use PBAR;
 /// Creates a tarball from a 'pkg' directory
 /// and publishes it to the NPM registry
 pub fn publish(
+    _target: String,
     path: Option<PathBuf>,
     access: Option<Access>,
     log: &Logger,
@@ -21,14 +24,55 @@ pub fn publish(
 
     info!(&log, "Publishing the npm package...");
     info!(&log, "npm info located in the npm debug log");
-    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 '{:#?}'",
-            &crate_path,
-            &crate_path
-        )
-    })?;
 
+    let pkg_directory = match find_pkg_directory(&crate_path) {
+        Some(path) => Ok(path),
+        None => {
+            // while `wasm-pack publish`, if the pkg directory cannot be found,
+            // then try to `wasm-pack build`
+            if Confirmation::new()
+                .with_text("Your package hasn't been built, build it?")
+                .interact()?
+            {
+                let out_dir = Input::new()
+                    .with_prompt("out_dir[default: pkg]")
+                    .default(".".to_string())
+                    .show_default(false)
+                    .interact()?;
+                let out_dir = format!("{}/pkg", out_dir);
+                let target = Select::new()
+                    .with_prompt("target[default: browser]")
+                    .items(&["browser", "nodejs", "no-modules"])
+                    .default(0)
+                    .interact()?
+                    .to_string();
+                let build_opts = BuildOptions {
+                    path: Some(crate_path.clone()),
+                    target,
+                    out_dir: out_dir.clone(),
+                    ..Default::default()
+                };
+                Build::try_from_opts(build_opts)
+                    .and_then(|mut build| build.run(&log))
+                    .map(|()| crate_path.join(out_dir))
+                    .map_err(|_| {
+                        format_err!(
+                            "Unable to find the pkg directory at path '{:#?}',\
+                             or in a child directory of '{:#?}'",
+                            &crate_path,
+                            &crate_path
+                        )
+                    })
+            } else {
+                bail!(
+                    "Unable to find the pkg directory at path '{:#?}',\
+                     or in a child directory of '{:#?}'",
+                    &crate_path,
+                    &crate_path
+                )
+            }
+        }
+    }?;
     npm::npm_publish(log, &pkg_directory.to_string_lossy(), access)?;
     info!(&log, "Published your package!");
 
diff --git a/src/command/utils.rs b/src/command/utils.rs
index 5927982..f171115 100644
--- a/src/command/utils.rs
+++ b/src/command/utils.rs
@@ -5,6 +5,7 @@ use failure;
 use progressbar::Step;
 use std::fs;
 use std::path::{Path, PathBuf};
+use walkdir::WalkDir;
 use PBAR;
 
 /// If an explicit path is given, then use it, otherwise assume the current
@@ -29,11 +30,10 @@ pub fn find_pkg_directory(path: &Path) -> Option<PathBuf> {
         return Some(path.to_owned());
     }
 
-    path.read_dir().ok().and_then(|entries| {
-        entries
-            .filter_map(|x| x.ok().map(|v| v.path()))
-            .find(|x| is_pkg_directory(&x))
-    })
+    WalkDir::new(path)
+        .into_iter()
+        .filter_map(|x| x.ok().map(|e| e.into_path()))
+        .find(|x| is_pkg_directory(&x))
 }
 
 fn is_pkg_directory(path: &Path) -> bool {
diff --git a/src/lib.rs b/src/lib.rs
index 6daee26..901e1a3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -22,9 +22,11 @@ extern crate serde_json;
 extern crate structopt;
 #[macro_use]
 extern crate slog;
+extern crate dialoguer;
 extern crate slog_async;
 extern crate slog_term;
 extern crate toml;
+extern crate walkdir;
 extern crate wasm_pack_binary_install;
 
 pub mod bindgen;
diff --git a/src/logger.rs b/src/logger.rs
index f8f6cc4..08add5d 100644
--- a/src/logger.rs
+++ b/src/logger.rs
@@ -38,7 +38,11 @@ fn log_file_path(cmd: &Command) -> PathBuf {
     let path = match cmd {
         Command::Build(build_opts) => &build_opts.path,
         Command::Pack { path } => path,
-        Command::Publish { path, access: _ } => path,
+        Command::Publish {
+            target: _,
+            path,
+            access: _,
+        } => path,
         Command::Test(test_opts) => &test_opts.path,
         Command::Login { .. } => &None,
     };
diff --git a/tests/all/build.rs b/tests/all/build.rs
index cc21fbb..7d06f15 100644
--- a/tests/all/build.rs
+++ b/tests/all/build.rs
@@ -228,3 +228,23 @@ 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",
+    );
+}