WebAssembly.compile()

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

Note: Webpages that have strict Content Security Policy (CSP) might block WebAssembly from compiling and executing modules. For more information on allowing WebAssembly compilation and execution, see the script-src CSP.

Syntax

js
WebAssembly.compile(bufferSource)

Parameters

bufferSource

A typed array or ArrayBuffer containing the binary code of the Wasm module you want to compile.

Return value

A Promise that resolves to a WebAssembly.Module object representing the compiled module.

Exceptions

Examples

Using compile

The following example compiles the loaded simple.wasm byte code using the compile() function and then sends it to a worker using postMessage().

js
const worker = new Worker("wasm_worker.js");

fetch("simple.wasm")
  .then((response) => response.arrayBuffer())
  .then((bytes) => WebAssembly.compile(bytes))
  .then((mod) => worker.postMessage(mod));

Note: You'll probably want to use WebAssembly.compileStreaming() in most cases, as it is more efficient than compile().

Specifications

Specification
WebAssembly JavaScript Interface
# dom-webassembly-compile

Browser compatibility

BCD tables only load in the browser

See also