Guide
ESLint rules which disallow each ECMAScript syntax.
🏁 Goal
Espree, the default parser of ESLint, has supported ecmaVersion option.
However, it doesn't support to enable each syntactic feature individually.
This plugin lets us disable each syntactic feature individually.
So we can enable arbitrary syntactic features with the combination of ecmaVersion and this plugin.
💿 Installation
npm install --save-dev eslint eslint-plugin-es
Requirements
- Node.js
6.5.0or newer. - ESLint
4.19.1or newer.
📖 Usage
Configure your .eslintrc.* file.
For example, to enable only Rest/Spread Properties in ES2018, as similar to legacy experimentalObjectRestSpread option:
{
"plugins": ["es"],
"parserOptions": {
"ecmaVersion": 2018
},
"rules": {
"es/no-async-iteration": "error",
"es/no-malformed-template-literals": "error",
"es/no-regexp-lookbehind-assertions": "error",
"es/no-regexp-named-capture-groups": "error",
"es/no-regexp-s-flag": "error",
"es/no-regexp-unicode-property-escapes": "error"
}
}
Presets
This plugin provides the following configs.
| Config ID | Description |
|---|---|
plugin:es/no-2018 | enable all rules which disallow ES2018 syntax. |
plugin:es/no-2017 | enable all rules which disallow ES2017 syntax. |
plugin:es/no-2016 | enable all rules which disallow ES2016 syntax. |
plugin:es/no-2015 | enable all rules which disallow ES2015 syntax. |
plugin:es/no-5 | enable all rules which disallow ES5 syntax. |
For example:
{
"plugins": ["es"],
"parserOptions": {
"ecmaVersion": 2018
},
"extends": [
"eslint:recommended",
"plugin:es/no-2018"
],
"rules": {
"es/no-rest-spread-properties": "off"
}
}