cmd(init/build): update docs

README.md

@@ -30,7 +30,8 @@ visiting that repo!
 
 ## 🎙️ Commands
 
-- [`init`](docs/init.md): Generate an npm wasm pkg from a rustwasm crate
+- [`init`](docs/init.md): Initialize an npm wasm pkg from a rustwasm crate
+- [`build`](docs/build.md): Generate an npm wasm pkg from a rustwasm crate
 - [`pack`](docs/pack.md): Create a tarball of your rustwasm pkg
 - [`publish`](docs/publish.md): Publish your rustwasm pkg to a registry
 
@@ -90,7 +91,7 @@ check out our [contribution policy].
   ```
 
 5. Install this tool: `cargo install wasm-pack`
-6. Run `wasm-pack init`, optionally, pass a path to a dir or a scope (see above for details)
+6. Run `wasm-pack build`, optionally, pass a path to a dir or a scope (see above for details)
 7. This tool generates files in a `pkg` dir
 8. To publish to npm, run `wasm-pack publish`. You may need to login to the
   registry you want to publish to. You can login using `wasm-pack login`.

docs/build.md

@@ -0,0 +1,73 @@
+# wasm-pack build
+
+The `wasm-pack build` command creates the files neccessary for JavaScript
+interoperability and for publishing a package to npm. This involves compiling
+your code to wasm and generating a pkg folder. This pkg folder will contain the
+wasm binary, a JS wrapper file, your `README`, and a `package.json` file.
+
+## Path
+
+The `wasm-pack build` command can be given an optional path argument, e.g.:
+
+```
+wasm-pack build examples/js-hello-world
+```
+
+This path should point to a directory that contains a `Cargo.toml` file. If no
+path is given, the `build` command will run in the current directory.
+
+## Debug
+
+The init command accepts an optional `--debug` argument. This will build the
+output package using cargo's
+[default non-release profile][cargo-profile-sections-documentation]. Building
+this way is faster but applies few optimizations to the output, and enables
+debug assertions and other runtime correctness checks.
+
+The exact meaning of this flag may evolve as the platform matures.
+
+[cargo-profile-sections-documentation]: https://doc.rust-lang.org/cargo/reference/manifest.html#the-profile-sections
+
+## Target
+
+The `build` command accepts a `--target` argument. This will customize the output files
+to align with a particular type of JS module. This allows wasm-pack to generate either
+ES6 modules or CommonJS modules for use in browser and in NodeJS. Defaults to `browser`.
+The options are:
+
+```
+wasm-pack build --target nodejs
+```
+
+| Option    | Description                                                                                                     |
+|-----------|-----------------------------------------------------------------------------------------------------------------|
+| `nodejs`  | Outputs JS that uses CommonJS modules, for use with a `require` statement.                                      |
+| `browser` | Outputs JS that uses ES6 modules, primarily for use with `import` statements and/or bundlers such as `webpack`. |
+
+## Scope
+
+The init command also accepts an optional `--scope` argument. This will scope
+your package name, which is useful if your package name might conflict with
+something in the public registry. For example:
+
+```
+wasm-pack build examples/js-hello-world --scope test
+```
+
+This command would create a `package.json` file for a package called
+`@test/js-hello-world`. For more information about scoping, you can refer to
+the npm documentation [here][npm-scope-documentation].
+
+[npm-scope-documentation]: https://docs.npmjs.com/misc/scope
+
+## Mode
+
+The `build` command accepts an optional `--mode` argument.
+```
+wasm-pack build examples/js-hello-world --mode no-install
+```
+
+| Option        | Description                                                                              |
+|---------------|------------------------------------------------------------------------------------------|
+| `no-install`  | `wasm-pack init` implicitly and create wasm binding  without installing `wasm-bindgen`.  |
+| `normal`      | do all the stuffs of `no-install` with installed `wasm-bindgen`.                         |

docs/init.md

@@ -1,9 +1,9 @@
 # wasm-pack init
 
 The `wasm-pack init` command creates the files neccessary for JavaScript
-interoperability and for publishing a package to npm. This involves compiling
-your code to wasm and generating a pkg folder. This pkg folder will contain the
-wasm binary, a JS wrapper file, your `README`, and a `package.json` file.
+interoperability and for publishing a package to npm. This involves
+generating a pkg folder. This pkg folder will contain the
+`README` and a `package.json` file.
 
 ## Path
 
@@ -46,27 +46,4 @@ This command would create a `package.json` file for a package called
 `@test/js-hello-world`. For more information about scoping, you can refer to
 the npm documentation [here][npm-scope-documentation].
 
-## Debug
-
-The init command accepts an optional `--debug` argument. This will build the
-output package using cargo's
-[default non-release profile][cargo-profile-sections-documentation]. Building
-this way is faster but applies few optimizations to the output, and enables
-debug assertions and other runtime correctness checks.
-
-The exact meaning of this flag may evolve as the platform matures.
-
-[npm-scope-documentation]: https://docs.npmjs.com/misc/scope
-[cargo-profile-sections-documentation]: https://doc.rust-lang.org/cargo/reference/manifest.html#the-profile-sections
-
-## Skipping build
-
-The init command accepts an optional `--skip-build` argument.
-
-This will deactivate those steps:
-- installing wasm target (via cargo)
-- compiling the code to wasm
-- installing wasm-bindgen (via rustup)
-- running wasm-bindgen on the built wasm
-
-Basically it will remains only the steps that update the metadata of `package.json`.
+[npm-scope-documentation]: https://docs.npmjs.com/misc/scope