Module WebAssembly 

Structs

CompileError

The WebAssembly.CompileError() constructor creates a new WebAssembly CompileError object, which indicates an error during WebAssembly decoding or validation.

CompileOptions

The compile options accepted by WebAssembly.validate(), compile(), instantiate(), their streaming forms and the Module constructor: the JS builtins to enable and the import module name for imported string constants.

Exception

The WebAssembly.Exception() constructor creates a new Exception object

Global

The WebAssembly.Global() constructor creates a new Global object of the given type and value.

Instance

A WebAssembly.Instance object is a stateful, executable instance of a WebAssembly.Module. Instance objects contain all the exported WebAssembly functions that allow calling into WebAssembly code from JavaScript.

InstantiatedSource

The { module, instance } pair that WebAssembly.instantiate() and WebAssembly.instantiateStreaming() resolve to when given bytes rather than a compiled Module.

LinkError

The WebAssembly.LinkError() constructor creates a new WebAssembly LinkError object, which indicates an error during module instantiation (besides traps from the start function).

Memory

MDN documentation

Module

A WebAssembly.Module object contains stateless WebAssembly code that has already been compiled by the browser and can be efficiently shared with Workers, and instantiated multiple times.

RuntimeError

The WebAssembly.RuntimeError() constructor creates a new WebAssembly RuntimeError object — the type that is thrown whenever WebAssembly specifies a trap.

Suspending

A WebAssembly.Suspending object wraps a JavaScript async function so it can be used as a WebAssembly import under JSPI (JS Promise Integration).

Table

The WebAssembly.Table() constructor creates a new Table object of the given size and element type.

Tag

The WebAssembly.Tag() constructor creates a new Tag object

Statics

JS_TAG

The WebAssembly.JSTag property is the Tag under which JavaScript exceptions are thrown into and caught from Wasm code.

Functions

compile

The WebAssembly.compile() function compiles a WebAssembly.Module from WebAssembly binary code. This function is useful if it is necessary to a compile a module before it can be instantiated (otherwise, the WebAssembly.instantiate() function should be used).

compile_streaming

The WebAssembly.compileStreaming() function compiles a WebAssembly.Module module directly from a streamed underlying source. This function is useful if it is necessary to a compile a module before it can be instantiated (otherwise, the WebAssembly.instantiateStreaming() function should be used).

compile_streaming_with_options

The WebAssembly.compileStreaming() function compiles a module from a streamed Response under the given compile options.

compile_with_options

The WebAssembly.compile() function compiles the given bytes under the given compile options.

instantiate_buffer

The WebAssembly.instantiate() function allows you to compile and instantiate WebAssembly code.

instantiate_buffer_with_options

The WebAssembly.instantiate() function compiles and instantiates the given bytes under the given compile options, resolving to an InstantiatedSource holding both the module and the instance.

instantiate_module

The WebAssembly.instantiate() function allows you to compile and instantiate WebAssembly code.

instantiate_streaming

The WebAssembly.instantiateStreaming() function compiles and instantiates a WebAssembly module directly from a streamed underlying source. This is the most efficient, optimized way to load Wasm code.

instantiate_streaming_with_options

The WebAssembly.instantiateStreaming() function compiles and instantiates a module from a streamed Response under the given compile options, resolving to an InstantiatedSource.

promising

Wraps a WebAssembly exported Function so that calling it returns a Promise and enables JSPI suspension inside.

validate

The WebAssembly.validate() function validates a given typed array of WebAssembly binary code, returning whether the bytes form a valid Wasm module (true) or not (false).

validate_with_options

The WebAssembly.validate() function validates the given bytes under the given compile options.