Crate wasm_bindgen

Runtime support for the wasm-bindgen tool

This crate contains the runtime support necessary for wasm-bindgen the attribute and tool. Crates pull in the #[wasm_bindgen] attribute through this crate and this crate also provides JS bindings through the JsValue interface.

Modules

closure

Support for long-lived closures in wasm-bindgen

convert

⚠️ Unstable

prelude

A module which is typically glob imported.

Macros

link_to

This macro takes a JS module as input and returns a URL that can be used to access it at runtime.

Structs

Clamped

A wrapper type around slices and vectors for binding the Uint8ClampedArray array in JS.

JsError

Convenience type for use on exported fn() -> Result<T, JsError> functions, where you wish to throw a JavaScript Error object.

JsStaticDeprecated

Wrapper type for imported statics.

JsThreadLocal

Wrapper type for imported statics.

JsValue

Representation of an object owned by JS.

Traits

JsCast

A trait for checked and unchecked casting between JS types.

UnwrapThrowExt

An extension trait for Option<T> and Result<T, E> for unwrapping the T value, or throwing a JS error if it is not available.

Functions

exports

Returns a handle to this Wasm instance’s WebAssembly.Instance.prototype.exports

externref_heap_live_count

Get the count of live externrefs / JsValues in wasm-bindgen’s heap.

function_table

Returns a handle to this Wasm instance’s WebAssembly.Table which is the indirect function table used by Rust

intern

Interns Rust strings so that it’s much faster to send them to JS.

memory

Returns a handle to this Wasm instance’s WebAssembly.Memory

module

Returns a handle to this Wasm instance’s WebAssembly.Module. This is only available when the final Wasm app is built with --target no-modules or --target web.

throw_str

Throws a JS exception.

throw_val

Rethrow a JS exception

unintern

Removes a Rust string from the intern cache.