Eslint does not allow static class properties
I'm current developing an API on Node 12.14.1 and using Eslint to help me write the code. Unfortunately it does not allow me to set static class properties as shown below:
class AuthManager {
static PROP = 'value'
}
The following error is given: Parsing error: Unexpected token =eslint
Static class properties are already supported on JS and on Node.
How can this rule be disable?
I also have the following .eslintrc.json
file:
{
"env": {
"es6": true,
"node": true
},
"extends": "eslint:recommended",
"globals": {
"Atomics": "readonly",
"SharedArrayBuffer": "readonly"
},
"parserOptions": {
"ecmaVersion": 2018,
"sourceType": "module"
}
}
ESLint with its default parser does not support class fields syntax for now. You can solve the problem by changing the configured parser to babel-eslint
.
npm install --save-dev babel-eslint
// eslintrc.json
{
"parser": "babel-eslint",
...
}
Eslint's default parser, Espree, does not support class fields because that syntax is currently stage 3, and that it is decided that only stage 4 proposals are to be supported in Espree.
ESLint v8 now supports static class properties natively: https://eslint.org/blog/2021/10/eslint-v8.0.0-released
parserOptions ecmaVersion should be set to 13, 2022, or "latest" to enable the support.
you need to install @babel/eslint-parser
:
yarn add --dev @babel/eslint-parser
And have the parser in your .eslintrc.yml
for instance:
parser: "@babel/eslint-parser"
As of now, I had to use these configs
.eslintrc.js
module.exports = {
env: {
node: true,
es6: true,
},
extends: [
'airbnb-base',
],
parser: '@babel/eslint-parser',
parserOptions: {
babelOptions: {
configFile: './.babelrc',
},
ecmaVersion: 2018, // needed to support spread in objects
},
plugins: ['@babel'],
};
.babelrc
{
"presets": ["@babel/env"],
"plugins": [
"@babel/plugin-syntax-class-properties"
]
}
For which I had to install:
npm i -D @babel/preset-env
npm i -D @babel/eslint-parser
npm i -D @babel/eslint-plugin
npm i -D @babel/plugin-syntax-class-properties
Notice that the @babel
modules above are the only @babel
modules in my package.json
.