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73 lines
3.0 KiB
73 lines
3.0 KiB
# wasm-pack build
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The `wasm-pack build` command creates the files neccessary for JavaScript
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interoperability and for publishing a package to npm. This involves compiling
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your code to wasm and generating a pkg folder. This pkg folder will contain the
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wasm binary, a JS wrapper file, your `README`, and a `package.json` file.
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## Path
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The `wasm-pack build` command can be given an optional path argument, e.g.:
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```
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wasm-pack build examples/js-hello-world
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```
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This path should point to a directory that contains a `Cargo.toml` file. If no
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path is given, the `build` command will run in the current directory.
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## Debug
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The init command accepts an optional `--debug` argument. This will build the
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output package using cargo's
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[default non-release profile][cargo-profile-sections-documentation]. Building
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this way is faster but applies few optimizations to the output, and enables
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debug assertions and other runtime correctness checks.
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The exact meaning of this flag may evolve as the platform matures.
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[cargo-profile-sections-documentation]: https://doc.rust-lang.org/cargo/reference/manifest.html#the-profile-sections
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## Target
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The `build` command accepts a `--target` argument. This will customize the output files
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to align with a particular type of JS module. This allows wasm-pack to generate either
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ES6 modules or CommonJS modules for use in browser and in NodeJS. Defaults to `browser`.
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The options are:
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```
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wasm-pack build --target nodejs
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```
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| Option | Description |
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|-----------|-----------------------------------------------------------------------------------------------------------------|
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| `nodejs` | Outputs JS that uses CommonJS modules, for use with a `require` statement. |
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| `browser` | Outputs JS that uses ES6 modules, primarily for use with `import` statements and/or bundlers such as `webpack`. |
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## Scope
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The init command also accepts an optional `--scope` argument. This will scope
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your package name, which is useful if your package name might conflict with
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something in the public registry. For example:
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```
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wasm-pack build examples/js-hello-world --scope test
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```
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This command would create a `package.json` file for a package called
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`@test/js-hello-world`. For more information about scoping, you can refer to
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the npm documentation [here][npm-scope-documentation].
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[npm-scope-documentation]: https://docs.npmjs.com/misc/scope
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## Mode
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The `build` command accepts an optional `--mode` argument.
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```
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wasm-pack build examples/js-hello-world --mode no-install
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```
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| Option | Description |
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|---------------|------------------------------------------------------------------------------------------|
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| `no-install` | `wasm-pack init` implicitly and create wasm binding without installing `wasm-bindgen`. |
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| `normal` | do all the stuffs of `no-install` with installed `wasm-bindgen`. |
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