Crate js_sys 

Bindings to JavaScript’s standard, built-in objects, including their methods and properties.

This does not include any Web, Node, or any other JS environment APIs. Only the things that are guaranteed to exist in the global scope by the ECMAScript standard.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects

A Note About camelCase, snake_case, and Naming Conventions

JavaScript’s global objects use camelCase naming conventions for functions and methods, but Rust style is to use snake_case. These bindings expose the Rust style snake_case name. Additionally, acronyms within a method name are all lower case, where as in JavaScript they are all upper case. For example, decodeURI in JavaScript is exposed as decode_uri in these bindings.

A Note About toString and to_js_string

JavaScript’s toString() method is exposed as to_js_string() in these bindings to avoid confusion with Rust’s ToString trait and its to_string() method. This allows types to implement both the Rust Display trait (which provides to_string() via ToString) and still expose the JavaScript toString() functionality.

Re-exports

pub use wasm_bindgen;

Modules

Atomics

The Atomics object provides atomic operations as static methods. They are used with SharedArrayBuffer objects.

Intl

JSON

The JSON object contains methods for parsing JavaScript Object Notation (JSON) and converting values to JSON. It can’t be called or constructed, and aside from its two method properties, it has no interesting functionality of its own.

Math

Reflect

WebAssembly

futures

Bridging between JavaScript Promises and Rust Futures.

Structs

AggregateError

The AggregateError object represents an error when several errors need to be wrapped in a single error. It is thrown when multiple errors need to be reported by an operation, for example by Promise::any, when all promises passed to it reject.

Array

ArrayBuffer

ArrayBufferOptions

ArrayIntoIter

Iterator returned by Array::into_iter

ArrayIter

Iterator returned by Array::iter

ArrayTuple

AsyncGenerator

AsyncIterator

Any object that conforms to the JS async iterator protocol. For example, something returned by myObject[Symbol.asyncIterator]().

BigInt

BigInt64Array

BigUint64Array

Boolean

DataView

Date

Error

ErrorOptions

The options dictionary accepted as the second argument to the Error constructor (and other built-in error constructors such as AggregateError). Its sole standard property is cause, which indicates the original cause of the error.

EvalError

FinalizationRegistry

The FinalizationRegistry object lets you request a callback when an object is garbage-collected.

Float16Array

Float32Array

Float64Array

Function

Function represents any generic Function in JS, by treating all arguments as JsValue.

Generator

Int8Array

Int16Array

Int32Array

IntoIter

An iterator over the JS Symbol.iterator iteration protocol.

Iter

An iterator over the JS Symbol.iterator iteration protocol.

Iterator

Any object that conforms to the JS iterator protocol. For example, something returned by myArray[Symbol.iterator]().

IteratorNext

The result of calling next() on a JS iterator.

JsOption

A nullable JS value of type T.

JsString

Map

Null

The JavaScript null value.

Number

Object

Promise

The Promise object represents the eventual completion (or failure) of an asynchronous operation, and its resulting value.

PromiseState

The PromiseState object represents the the status of the promise, as used in allSettled.

PropertyDescriptor

Proxy

RangeError

The RangeError object indicates an error when a value is not in the set or range of allowed values.

ReferenceError

The ReferenceError object represents an error when a non-existent variable is referenced.

RegExp

RegExpMatchArray

The result array from RegExp.exec() or String.matchAll().

Set

SharedArrayBuffer

Symbol

SyntaxError

A SyntaxError is thrown when the JavaScript engine encounters tokens or token order that does not conform to the syntax of the language when parsing code.

TryFromIntError

The error type returned when a checked integral type conversion fails.

TypeError

The TypeError object represents an error when a value is not of the expected type.

Uint8Array

Uint8ClampedArray

Uint16Array

Uint32Array

Undefined

The JavaScript undefined value.

UriError

The URIError object represents an error when a global URI handling function was used in a wrong way.

WeakMap

WeakRef

WeakSet

Traits

AsyncIterable

Trait for types known to implement the iterator protocol on Symbol.asyncIterator

FunctionIntoClosure

IntoJsGeneric

Converts a value into its canonical JS-generic representation.

Iterable

Trait for JavaScript types that implement the iterable protocol via Symbol.iterator.

JsArgs

Trait for argument tuples that can call or bind a Function<T>.

JsFunction

JsFunction1

JsFunction2

JsFunction3

JsFunction4

JsFunction5

JsFunction6

JsFunction7

JsFunction8

JsGeneric

Convenience bound for JS values whose generic parameters erase to JsValue.

JsTuple

Base trait for tuple types.

JsTuple1

JsTuple2

JsTuple3

JsTuple4

JsTuple5

JsTuple6

JsTuple7

JsTuple8

Promising

Marker trait for values that are either a resolution value or a promise-like value.

TypedArray

Functions

decode_uri

decode_uri_component

encode_uri

encode_uri_component

escape

eval

global

Returns a handle to the global scope object.

is_finite

parse_float

parse_int

try_iter

Create an iterator over val using the JS iteration protocol and Symbol.iterator.

unescape

Attribute Macros

wasm_bindgen

The main wasm_bindgen attribute macro.