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<ol class="chapter"><li class="affix"><a href="../introduction.html">Introduction</a></li><li class="spacer"></li><li><a href="../examples/index.html"><strong aria-hidden="true">1.</strong> Examples</a></li><li><ol class="section"><li><a href="../examples/hello-world.html"><strong aria-hidden="true">1.1.</strong> Hello, World!</a></li><li><a href="../examples/console-log.html"><strong aria-hidden="true">1.2.</strong> Using console.log</a></li><li><a href="../examples/add.html"><strong aria-hidden="true">1.3.</strong> Small wasm files</a></li><li><a href="../examples/without-a-bundler.html"><strong aria-hidden="true">1.4.</strong> Without a Bundler</a></li><li><a href="../examples/wasm2js.html"><strong aria-hidden="true">1.5.</strong> Converting WebAssembly to JS</a></li><li><a href="../examples/import-js.html"><strong aria-hidden="true">1.6.</strong> Importing functions from JS</a></li><li><a href="../examples/char.html"><strong aria-hidden="true">1.7.</strong> Working with char</a></li><li><a href="../examples/wasm-in-wasm.html"><strong aria-hidden="true">1.8.</strong> js-sys: WebAssembly in WebAssembly</a></li><li><a href="../examples/dom.html"><strong aria-hidden="true">1.9.</strong> web-sys: DOM hello world</a></li><li><a href="../examples/closures.html"><strong aria-hidden="true">1.10.</strong> web-sys: Closures</a></li><li><a href="../examples/performance.html"><strong aria-hidden="true">1.11.</strong> web-sys: performance.now</a></li><li><a href="../examples/fetch.html"><strong aria-hidden="true">1.12.</strong> web-sys: using fetch</a></li><li><a href="../examples/2d-canvas.html"><strong aria-hidden="true">1.13.</strong> web-sys: canvas hello world</a></li><li><a href="../examples/julia.html"><strong aria-hidden="true">1.14.</strong> web-sys: canvas Julia set</a></li><li><a href="../examples/web-audio.html"><strong aria-hidden="true">1.15.</strong> web-sys: WebAudio</a></li><li><a href="../examples/webgl.html"><strong aria-hidden="true">1.16.</strong> web-sys: WebGL</a></li><li><a href="../examples/websockets.html"><strong aria-hidden="true">1.17.</strong> web-sys: WebSockets</a></li><li><a href="../examples/webrtc_datachannel.html"><strong aria-hidden="true">1.18.</strong> web-sys: WebRTC DataChannel</a></li><li><a href="../examples/request-animation-frame.html"><strong aria-hidden="true">1.19.</strong> web-sys: requestAnimationFrame</a></li><li><a href="../examples/paint.html"><strong aria-hidden="true">1.20.</strong> web-sys: A Simple Paint Program</a></li><li><a href="../examples/raytrace.html"><strong aria-hidden="true">1.21.</strong> Parallel Raytracing</a></li><li><a href="../examples/todomvc.html"><strong aria-hidden="true">1.22.</strong> web-sys: A TODO MVC App</a></li></ol></li><li><a href="../reference/index.html"><strong aria-hidden="true">2.</strong> Reference</a></li><li><ol class="section"><li><a href="../reference/deployment.html"><strong aria-hidden="true">2.1.</strong> Deployment</a></li><li><a href="../reference/js-snippets.html"><strong aria-hidden="true">2.2.</strong> JS snippets</a></li><li><a href="../reference/passing-rust-closures-to-js.html"><strong aria-hidden="true">2.3.</strong> Passing Rust Closures to JS</a></li><li><a href="../reference/receiving-js-closures-in-rust.html"><strong aria-hidden="true">2.4.</strong> Receiving JS Closures in Rust</a></li><li><a href="../reference/js-promises-and-rust-futures.html"><strong aria-hidden="true">2.5.</strong> Promises and Futures</a></li><li><a href="../reference/iterating-over-js-values.html"><strong aria-hidden="true">2.6.</strong> Iterating over JS Values</a></li><li><a href="../reference/arbitrary-data-with-serde.html"><strong aria-hidden="true">2.7.</strong> Arbitrary Data with Serde</a></li><li><a href="../reference/accessing-properties-of-untyped-js-values.html"><strong aria-hidden="true">2.8.</strong> Accessing Properties of Untyped JS Values</a></li><li><a href="../reference/working-with-duck-typed-interfaces.html"><strong aria-hidden="true">2.9.</strong> Working with Duck-Typed Interfaces</a></li><li><a href="../reference/cli.html" class="active"><strong aria-hidden="true">2.10.</strong> Command Line Interface</a></li><li><a href="../reference/optimize-size.html"><strong aria-hidden="true">2.11.</strong> Optimizing for Size</a></li><li><a href="../reference/rust-targets.html"><strong aria-hidden="true">2.12.</strong> Supported Rust Targets</a></li><li><a href="../reference/browser-support.html"><strong aria-hidden="true">2.13.</strong> Supported Browsers</a></li><li><a href="../reference/types.html"><strong aria-hidden="true">2.14.</strong> Supported Types</a></li><li><ol class="section"><li><a href="../reference/types/imported-js-types.html"><strong aria-hidden="true">2.14.1.</strong> Imported JavaScript Types</a></li><li><a href="../reference/types/exported-rust-types.html"><strong aria-hidden="true">2.14.2.</strong> Exported Rust Types</a></li><li><a href="../reference/types/jsvalue.html"><strong aria-hidden="true">2.14.3.</strong> JsValue</a></li><li><a href="../reference/types/boxed-jsvalue-slice.html"><strong aria-hidden="true">2.14.4.</strong> Box<[JsValue]></a></li><li><a href="../reference/types/pointers.html"><strong aria-hidden="true">2.14.5.</strong> *const T and *mut T</a></li><li><a href="../reference/types/numbers.html"><strong aria-hidden="true">2.14.6.</strong> Numbers</a></li><li><a href="../reference/types/bool.html"><strong aria-hidden="true">2.14.7.</strong> bool</a></li><li><a href="../reference/types/char.html"><strong aria-hidden="true">2.14.8.</strong> char</a></li><li><a href="../reference/types/str.html"><strong aria-hidden="true">2.14.9.</strong> str</a></li><li><a href="../reference/types/string.html"><strong aria-hidden="true">2.14.10.</strong> String</a></li><li><a href="../reference/types/number-slices.html"><strong aria-hidden="true">2.14.11.</strong> Number Slices</a></li><li><a href="../reference/types/boxed-number-slices.html"><strong aria-hidden="true">2.14.12.</strong> Boxed Number Slices</a></li><li><a href="../reference/types/result.html"><strong aria-hidden="true">2.14.13.</strong> Result<T, JsValue></a></li></ol></li><li><a href="../reference/attributes/index.html"><strong aria-hidden="true">2.15.</strong> #[wasm_bindgen] Attributes</a></li><li><ol class="section"><li><a href="../reference/attributes/on-js-imports/index.html"><strong aria-hidden="true">2.15.1.</strong> On JavaScript Imports</a></li><li><ol class="section"><li><a href="../reference/attributes/on-js-imports/catch.html"><strong aria-hidden="true">2.15.1.1.</strong> catch</a></li><li><a href="../reference/attributes/on-js-imports/constructor.html"><strong aria-hidden="true">2.15.1.2.</strong> constructor</a></li><li><a href="../reference/attributes/on-js-imports/extends.html"><strong aria-hidden="true">2.15.1.3.</strong> extends</a></li><li><a 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class="section"><li><a href="../reference/attributes/on-rust-exports/constructor.html"><strong aria-hidden="true">2.15.2.1.</strong> constructor</a></li><li><a href="../reference/attributes/on-rust-exports/js_name.html"><strong aria-hidden="true">2.15.2.2.</strong> js_name = Blah</a></li><li><a href="../reference/attributes/on-rust-exports/readonly.html"><strong aria-hidden="true">2.15.2.3.</strong> readonly</a></li><li><a href="../reference/attributes/on-rust-exports/skip.html"><strong aria-hidden="true">2.15.2.4.</strong> skip</a></li><li><a href="../reference/attributes/on-rust-exports/start.html"><strong aria-hidden="true">2.15.2.5.</strong> start</a></li><li><a href="../reference/attributes/on-rust-exports/typescript_custom_section.html"><strong aria-hidden="true">2.15.2.6.</strong> typescript_custom_section</a></li><li><a href="../reference/attributes/on-rust-exports/getter-and-setter.html"><strong aria-hidden="true">2.15.2.7.</strong> getter and setter</a></li><li><a href="../reference/attributes/on-rust-exports/inspectable.html"><strong aria-hidden="true">2.15.2.8.</strong> inspectable</a></li><li><a href="../reference/attributes/on-rust-exports/skip_typescript.html"><strong aria-hidden="true">2.15.2.9.</strong> skip_typescript</a></li><li><a href="../reference/attributes/on-rust-exports/typescript_type.html"><strong aria-hidden="true">2.15.2.10.</strong> typescript_type</a></li></ol></li></ol></li></ol></li><li><a href="../web-sys/index.html"><strong aria-hidden="true">3.</strong> web-sys</a></li><li><ol class="section"><li><a href="../web-sys/using-web-sys.html"><strong aria-hidden="true">3.1.</strong> Using web-sys</a></li><li><a href="../web-sys/cargo-features.html"><strong aria-hidden="true">3.2.</strong> Cargo Features</a></li><li><a href="../web-sys/function-overloads.html"><strong aria-hidden="true">3.3.</strong> Function Overloads</a></li><li><a href="../web-sys/type-translations.html"><strong aria-hidden="true">3.4.</strong> Type Translations</a></li><li><a href="../web-sys/inheritance.html"><strong aria-hidden="true">3.5.</strong> Inheritance</a></li><li><a href="../web-sys/unstable-apis.html"><strong aria-hidden="true">3.6.</strong> Unstable APIs</a></li></ol></li><li><a href="../wasm-bindgen-test/index.html"><strong aria-hidden="true">4.</strong> Testing with wasm-bindgen-test</a></li><li><ol class="section"><li><a href="../wasm-bindgen-test/usage.html"><strong aria-hidden="true">4.1.</strong> Usage</a></li><li><a href="../wasm-bindgen-test/asynchronous-tests.html"><strong aria-hidden="true">4.2.</strong> Writing Asynchronous Tests</a></li><li><a href="../wasm-bindgen-test/browsers.html"><strong aria-hidden="true">4.3.</strong> Testing in Headless Browsers</a></li><li><a href="../wasm-bindgen-test/continuous-integration.html"><strong aria-hidden="true">4.4.</strong> Continuous Integration</a></li></ol></li><li><a href="../contributing/index.html"><strong aria-hidden="true">5.</strong> Contributing to wasm-bindgen</a></li><li><ol class="section"><li><a href="../contributing/testing.html"><strong aria-hidden="true">5.1.</strong> Testing</a></li><li><a href="../contributing/design/index.html"><strong aria-hidden="true">5.2.</strong> Internal Design</a></li><li><ol class="section"><li><a href="../contributing/design/js-objects-in-rust.html"><strong aria-hidden="true">5.2.1.</strong> JS Objects in Rust</a></li><li><a href="../contributing/design/exporting-rust.html"><strong aria-hidden="true">5.2.2.</strong> Exporting a function to JS</a></li><li><a href="../contributing/design/exporting-rust-struct.html"><strong aria-hidden="true">5.2.3.</strong> Exporting a struct to JS</a></li><li><a href="../contributing/design/importing-js.html"><strong aria-hidden="true">5.2.4.</strong> Importing a function from JS</a></li><li><a href="../contributing/design/importing-js-struct.html"><strong aria-hidden="true">5.2.5.</strong> Importing a class from JS</a></li><li><a href="../contributing/design/rust-type-conversions.html"><strong aria-hidden="true">5.2.6.</strong> Rust Type conversions</a></li><li><a href="../contributing/design/describe.html"><strong aria-hidden="true">5.2.7.</strong> Types in wasm-bindgen</a></li></ol></li><li><a href="../contributing/js-sys/index.html"><strong aria-hidden="true">5.3.</strong> js-sys</a></li><li><ol class="section"><li><a href="../contributing/js-sys/testing.html"><strong aria-hidden="true">5.3.1.</strong> Testing</a></li><li><a href="../contributing/js-sys/adding-more-apis.html"><strong aria-hidden="true">5.3.2.</strong> Adding More APIs</a></li></ol></li><li><a href="../contributing/web-sys/index.html"><strong aria-hidden="true">5.4.</strong> web-sys</a></li><li><ol class="section"><li><a href="../contributing/web-sys/overview.html"><strong aria-hidden="true">5.4.1.</strong> Overview</a></li><li><a href="../contributing/web-sys/testing.html"><strong aria-hidden="true">5.4.2.</strong> Testing</a></li><li><a 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<h1><a class="header" href="#the-wasm-bindgen-command-line-interface" id="the-wasm-bindgen-command-line-interface">The <code>wasm-bindgen</code> Command Line Interface</a></h1>
|
|
<p>The <code>wasm-bindgen</code> command line tool has a number of options available to it to
|
|
tweak the JavaScript that is generated. The most up-to-date set of flags can
|
|
always be listed via <code>wasm-bindgen --help</code>.</p>
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|
<blockquote>
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|
<p>Note: usually, one should use a <a href="https://github.com/rustwasm/wasm-pack"><code>wasm-pack</code>-based workflow</a> rather
|
|
than running the <code>wasm-bindgen</code> command line tool by hand.</p>
|
|
</blockquote>
|
|
<h2><a class="header" href="#installation" id="installation">Installation</a></h2>
|
|
<p>The recommend way to install the <code>wasm-bindgen</code> command line tool is with the
|
|
<code>wasm-pack</code> installer described
|
|
<a href="https://rustwasm.github.io/wasm-pack/installer/">here</a>. After installing
|
|
<code>wasm-pack</code>, you are ready to build project invoking <code>wasm-pack build</code>.
|
|
This command installs apropriate version of the <code>wasm-bindgen</code> command-line
|
|
tool. The version of <code>wasm-bindgen</code> installed by <code>wasm-pack</code> is not available
|
|
to be used directly via command line.</p>
|
|
<p>It is not recommended to install <code>wasm-bindgen-cli</code> as its version must match
|
|
<em>exactly</em> the version of <code>wasm-bindgen</code> that is specified in the project's
|
|
cargo.lock file. Using <code>wasm-pack</code> for building simplifies the build process
|
|
as <code>wasm-pack</code> ensures that the proper version of <code>wasm-bindgen</code> command-line
|
|
tool is used. That means that <code>wasm-pack</code> may install many different versions
|
|
of <code>wasm-bindgen</code>, but during the build <code>wasm-pack</code> will always make sure to
|
|
use the correct one.</p>
|
|
<p>Note: if, for any reason, you decide to use wasm-bindgen directly (this is
|
|
not recommended!) you will have to manually take care of using exactly the
|
|
same version of wasm-bindgen command-line tool (wasm-bindgen-cli) that
|
|
matches the version of wasm-bingden in cargo.lock.</p>
|
|
<h2><a class="header" href="#usage" id="usage">Usage</a></h2>
|
|
<pre><code>wasm-bindgen [options] ./target/wasm32-unknown-unknown/release/crate.wasm
|
|
</code></pre>
|
|
<h2><a class="header" href="#options" id="options">Options</a></h2>
|
|
<h3><a class="header" href="#--out-dir-dir" id="--out-dir-dir"><code>--out-dir DIR</code></a></h3>
|
|
<p>The target directory to emit the JavaScript bindings, TypeScript definitions,
|
|
processed <code>.wasm</code> binary, etc...</p>
|
|
<h3><a class="header" href="#--target" id="--target"><code>--target</code></a></h3>
|
|
<p>This flag indicates what flavor of output what <code>wasm-bindgen</code> should generate.
|
|
For example it could generate code to be loaded in a bundler like Webpack, a
|
|
native web page, or Node.js. For a full list of options to pass this flag, see
|
|
the section on <a href="deployment.html">deployment</a></p>
|
|
<h3><a class="header" href="#--no-modules-global-var" id="--no-modules-global-var"><code>--no-modules-global VAR</code></a></h3>
|
|
<p>When <code>--target no-modules</code> is used this flag can indicate what the name of the
|
|
global to assign generated bindings to.</p>
|
|
<p>For more information about this see the section on <a href="deployment.html">deployment</a></p>
|
|
<h3><a class="header" href="#--typescript" id="--typescript"><code>--typescript</code></a></h3>
|
|
<p>Output a TypeScript declaration file for the generated JavaScript bindings. This
|
|
is on by default.</p>
|
|
<h3><a class="header" href="#--no-typescript" id="--no-typescript"><code>--no-typescript</code></a></h3>
|
|
<p>By default, a <code>*.d.ts</code> TypeScript declaration file is generated for the
|
|
generated JavaScript bindings, but this flag will disable that.</p>
|
|
<h3><a class="header" href="#--omit-imports" id="--omit-imports"><code>--omit-imports</code></a></h3>
|
|
<p>When the <code>module</code> attribute is used with the <code>wasm-bindgen</code> macro, the code
|
|
generator will emit corresponding <code>import</code> or <code>require</code> statements in the header
|
|
section of the generated javascript. This flag causes those import statements to
|
|
be omitted. This is necessary for some use cases, such as generating javascript
|
|
which is intended to be used with Electron (with node integration disabled),
|
|
where the imports are instead handled through a separate preload script.</p>
|
|
<h3><a class="header" href="#--debug" id="--debug"><code>--debug</code></a></h3>
|
|
<p>Generates a bit more JS and wasm in "debug mode" to help catch programmer
|
|
errors, but this output isn't intended to be shipped to production.</p>
|
|
<h3><a class="header" href="#--no-demangle" id="--no-demangle"><code>--no-demangle</code></a></h3>
|
|
<p>When post-processing the <code>.wasm</code> binary, do not demangle Rust symbols in the
|
|
"names" custom section.</p>
|
|
<h3><a class="header" href="#--keep-debug" id="--keep-debug"><code>--keep-debug</code></a></h3>
|
|
<p>When post-processing the <code>.wasm</code> binary, do not strip DWARF debug info custom
|
|
sections.</p>
|
|
<h3><a class="header" href="#--browser" id="--browser"><code>--browser</code></a></h3>
|
|
<p>When generating bundler-compatible code (see the section on <a href="deployment.html">deployment</a>) this
|
|
indicates that the bundled code is always intended to go into a browser so a few
|
|
checks for Node.js can be elided.</p>
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