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# 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
### Arrow function expressions
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions#browser_compatibility)
- For Wasm_of_ocaml
### Classes
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes#browser_compatibility)
### const
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const#browser_compatibility)
### for...of
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of#browser_compatibility)
### let
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let#browser_compatibility)
### Map
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#browser_compatibility)
- Used in runtime for data structures and object tracking
### Object.assign
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign#browser_compatibility)
### Rest parameters
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters#browser_compatibility)
### Set
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set#browser_compatibility)
### Spread syntax (in function call)
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax#browser_compatibility)
### TypedArray
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray#browser_compatibility)
- To implement bigarray
### WeakMap
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap#browser_compatibility)
### DataView
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView#browser_compatibility)
## ECMAScript 2016
### async function
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function#browser_compatibility)
- For Wasm_of_ocaml
### await
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/await#browser_compatibility)
- For Wasm_of_ocaml
## ECMAScript 2020
### BigInt
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt#browser_compatibility)
- For Wasm_of_ocaml
### globalThis
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis#browser_compatibility)
- Polyfilled in the repository
### Optional chaining (?.)
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining#browser_compatibility)
## ECMAScript 2021
### FinalizationRegistry
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/FinalizationRegistry#browser_compatibility)
- Optional for js_of_ocaml
### WeakRef
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakRef#browser_compatibility)
- To implement weak and ephemeron
- Optional
## Web APIs
### Canvas API
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API#browser_compatibility)
### Crypto API
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/API/Crypto#browser_compatibility)
### Document API
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/API/Document#browser_compatibility)
### Image API
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/API/HTMLImageElement#browser_compatibility)
### Performance API
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/API/Performance#browser_compatibility)
### XMLHttpRequest
- [Compatibility](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest#browser_compatibility)
## Node.js
### Built-in modules with `node:` prefix
- [Compatibility](https://nodejs.org/docs/latest/api/modules.html#built-in-modules)
### Child process
- [Compatibility](https://nodejs.org/docs/latest/api/child_process.html)
### File system
- [Compatibility](https://nodejs.org/docs/latest/api/fs.html)
### Process
- [Compatibility](https://nodejs.org/docs/latest/api/process.html)
### TTY
- [Compatibility](https://nodejs.org/docs/latest/api/tty.html)
### Util
- [Compatibility](https://nodejs.org/docs/latest/api/util.html)
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