Wrapper that simplifies ESLint API and makes it compatible with πPutout
npm install @putout/eslint[NPMIMGURL]: https://img.shields.io/npm/v/@putout/eslint.svg?style=flat&longCache=true
[NPMURL]: https://npmjs.org/package/@putout/eslint "npm"
Wrapper that simplifies ESLint API and makes it compatible with πPutout.
βοΈ FlatConfig supported from the box.
```
npm i @putout/eslint
- βοΈ To set custom config file for ESLint use ESLINT_CONFIG_FILE env variable:NO_ESLINT=1
- βοΈ To disable ESLint support use env variable:NO_ESLINT_WARNINGS=1
- βοΈ If you want to ignore ESLint warnings (which is unfixable errors in πPutout language) use :
``sh
NO_ESLINT_WARNINGS=1 putout --fix lib
ESLint begins his work as a formatter when πPutout done his transformations. That's why it used a lot in different parts of application, for testing purpose and using API in a simplest possible way. You can access it with:
`js``
import {eslint} from '@putout/eslint';
To use it simply write:
`jsconst t = 'hi'\n
const [source, places] = await eslint({
name: 'hello.js',
code: ,`
fix: false,
});
Isn't it looks similar to πPutout way? It definitely is! But... It has a couple differences you should remember:
- βοΈ πPutout returns object with code and places properties, and ESLint returns a tuple
- βοΈ ESLint has a name property that is used to calculate configuration file.
And you can even override any of ESLint βοΈ options with help of config property:
`js
import {safeAlign} from 'eslint-plugin-putout';
const [source, places] = await eslint({
name: 'hello.js',
code: const t = 'hi'\n,`
fix: false,
config: [safeAlign],
});
If you want to apply πPutout transformations using putout/putout ESLint rule, enable πPutout with the same called but lowercased flag:
`js
import {safeAlign} from 'eslint-plugin-putout';
const [source, places] = await eslint({
name: 'hello.js',
code: const t = 'hi'\n,`
fix: true,
putout: true,
config: [safeAlign],
});
It is disabled by default, because ESLint always runs after πPutout transformations, so there is no need to traverse tree again.
You can also simplify creating of plugins for ESLint with help of createPlugin.
πPutout-based ESLint plugin are highly inspired by Putout Plugins API of Includer.
So it must contain classic 4 methods:
`js
export const report = () => 'debugger statement should not be used';
export const fix = (path) => {
return '';
};
export const include = () => [
'DebuggerStatement',
];
export const filter = (path) => {
return true;
};
`
The main difference with Includer is:
- fix works with text;include
- does not support π¦PutoutScript;exclude
- there is no ;
Take a look at more sophisticated example, rule remove-duplicate-extensions:
`js
const getValue = ({source}) => source?.value;
export const report = () => 'Avoid duplicate extensions in relative imports';
export const include = () => [
'ImportDeclaration',
'ImportExpression',
'ExportAllDeclaration',
'ExportNamedDeclaration',
];
export const fix = ({text}) => {
return text.replace('.js.js', '.js');
};
export const filter = ({node}) => {
const value = getValue(node);
return /\.js\.js/.test(value);
};
`
To use it just add couple lines to your main plugin file:
`js
import {createPlugin} from '@putout/eslint/create-plugin';
const createRule = (a) => ({
[a]: createPlugin(require(./${a})),
});
module.exports.rules = createRule('remove-duplicate-extensions');
`
Or just:
`js
import {createPlugin} from '@putout/eslint/create-plugin';
module.exports.rules = {
'remove-duplicate-extensions': createPlugin(require('./remove-duplicate-extensions')),
};
`
When you need to run ESLint with one plugin (rule), just use lint it will do the thing.
`js
import {lint} from '@putout/eslint/lint';
import {createPlugin} from '@putout/eslint/create-plugin';
import * as removeDebugger from 'remove-debugger';
const [code, places] = lint('debugger', {
fix: true, // default
plugins: [
['remove-debugger', createPlugin(removeDebugger)],
],
});
`
When you want to skip plugins, and just provide options and filename you can:
`js
import {lint} from '@putout/eslint/lint';
const [code, places] = lint('debugger', {
filename: 'index.js',
options: [{
rules: {
semi: 'error',
},
}],
});
``
MIT