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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `wasm_bindgen` crate."><meta name="keywords" content="rust, rustlang, rust-lang, wasm_bindgen"><title>wasm_bindgen - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../wasm_bindgen/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><p class='location'>Crate wasm_bindgen</p><div class="sidebar-elems"><a id='all-types' href='all.html'><p>See all wasm_bindgen's items</p></a><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'wasm_bindgen', ty: 'mod', relpath: '../'};</script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press S to search, ? for more options…" type="search"></div><a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>&#x2212;</span>]</a></span><a class='srclink' href='../src/wasm_bindgen/lib.rs.html#1-1174' title='goto source code'>[src]</a></span><span class='in-band'>Crate <a class="mod" href=''>wasm_bindgen</a></span></h1><div class='docblock'><p>Runtime support for the <code>wasm-bindgen</code> tool</p>
<p>This crate contains the runtime support necessary for <code>wasm-bindgen</code> the
attribute and tool. Crates pull in the <code>#[wasm_bindgen]</code> attribute through
this crate and this crate also provides JS bindings through the <code>JsValue</code>
interface.</p>
</div><h2 id='modules' class='section-header'><a href="#modules">Modules</a></h2>
<table><tr class='module-item'><td><a class="mod" href="closure/index.html" title='wasm_bindgen::closure mod'>closure</a></td><td class='docblock-short'><p>Support for long-lived closures in <code>wasm-bindgen</code></p>
</td></tr><tr class='module-item'><td><a class="mod" href="convert/index.html" title='wasm_bindgen::convert mod'>convert</a></td><td class='docblock-short'><p>This is mostly an internal module, no stability guarantees are provided. Use
at your own risk.</p>
</td></tr><tr class='module-item'><td><a class="mod" href="prelude/index.html" title='wasm_bindgen::prelude mod'>prelude</a></td><td class='docblock-short'><p>A module which is typically glob imported from:</p>
</td></tr></table><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
<table><tr class='module-item'><td><a class="struct" href="struct.Clamped.html" title='wasm_bindgen::Clamped struct'>Clamped</a></td><td class='docblock-short'><p>A wrapper type around slices and vectors for binding the <code>Uint8ClampedArray</code>
array in JS.</p>
</td></tr><tr class='module-item'><td><a class="struct" href="struct.JsStatic.html" title='wasm_bindgen::JsStatic struct'>JsStatic</a></td><td class='docblock-short'><p>Wrapper type for imported statics.</p>
</td></tr><tr class='module-item'><td><a class="struct" href="struct.JsValue.html" title='wasm_bindgen::JsValue struct'>JsValue</a></td><td class='docblock-short'><p>Representation of an object owned by JS.</p>
</td></tr></table><h2 id='traits' class='section-header'><a href="#traits">Traits</a></h2>
<table><tr class='module-item'><td><a class="trait" href="trait.JsCast.html" title='wasm_bindgen::JsCast trait'>JsCast</a></td><td class='docblock-short'><p>A trait for checked and unchecked casting between JS types.</p>
</td></tr><tr class='module-item'><td><a class="trait" href="trait.UnwrapThrowExt.html" title='wasm_bindgen::UnwrapThrowExt trait'>UnwrapThrowExt</a></td><td class='docblock-short'><p>An extension trait for <code>Option&lt;T&gt;</code> and <code>Result&lt;T, E&gt;</code> for unwraping the <code>T</code>
value, or throwing a JS error if it is not available.</p>
</td></tr></table><h2 id='functions' class='section-header'><a href="#functions">Functions</a></h2>
<table><tr class='module-item'><td><a class="fn" href="fn.externref_heap_live_count.html" title='wasm_bindgen::externref_heap_live_count fn'>externref_heap_live_count</a></td><td class='docblock-short'><p>Get the count of live <code>externref</code>s / <code>JsValue</code>s in <code>wasm-bindgen</code>'s heap.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.function_table.html" title='wasm_bindgen::function_table fn'>function_table</a></td><td class='docblock-short'><p>Returns a handle to this wasm instance's <code>WebAssembly.Table</code> which is the
indirect function table used by Rust</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.intern.html" title='wasm_bindgen::intern fn'>intern</a></td><td class='docblock-short'><p>Interns Rust strings so that it's much faster to send them to JS.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.memory.html" title='wasm_bindgen::memory fn'>memory</a></td><td class='docblock-short'><p>Returns a handle to this wasm instance's <code>WebAssembly.Memory</code></p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.throw_str.html" title='wasm_bindgen::throw_str fn'>throw_str</a></td><td class='docblock-short'><p>Throws a JS exception.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.throw_val.html" title='wasm_bindgen::throw_val fn'>throw_val</a></td><td class='docblock-short'><p>Rethrow a JS exception</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.unintern.html" title='wasm_bindgen::unintern fn'>unintern</a></td><td class='docblock-short'><p>Removes a Rust string from the intern cache.</p>
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