ECMASCRIPT.md

ECMAScript and Node requirements

The goal of the document is to list features we rely on for the runtime and the generated code. Features are grouped by ECMAScript version.

ECMAScript 2015

Rest parameters

• Compatibility

Spread syntax (in function call)

• Compatibility

Object.assign

• Compatibility

Arrow function expressions

• Compatibility
• For Wasm_of_ocaml

TypedArray

• Compatibility
• To implement bigarray

ECMAScript 2016

async function

• Compatibility
• For Wasm_of_ocaml

await

• Compatibility
• For Wasm_of_ocaml

ECMAScript 2020

globalThis

• Compatibility
• Polyfilled in the repository

ECMAScript 2021

WeakRef

• Compatibility
• To implement weak and ephemeron
• Optional

Node.js

Built-in modules with node: prefix

• Compatibility