eslint-webpack-plugin
A ESLint plugin for webpack
About plugin
The plugin was born with the purpose of solving some problems of the eslint-loader.
| eslint-webpack-plugin | eslint-loader | |
|---|---|---|
| Easy configuration |  |
 |
| Generate unique an output report | |
|
| Using cache directly from eslint | |
|
| Lint only changed files | |
|
Migrate from eslint-loader
The loader eslint-loader will be deprecated soon, please use this plugin instead.
Before:
module.exports = {
// ...
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
loader: 'eslint-loader',
options: {
// eslint options (if necessary)
},
},
],
},
// ...
};
After:
const ESLintPlugin = require('eslint-webpack-plugin');
module.exports = {
// ...
plugins: [new ESLintPlugin(options)],
// ...
};
Install
npm install eslint-webpack-plugin --save-dev
Note: You also need to install eslint >= 7 from npm, if you haven't already:
npm install eslint --save-dev
Usage
In your webpack configuration:
const ESLintPlugin = require('eslint-webpack-plugin');
module.exports = {
// ...
plugins: [new ESLintPlugin(options)],
// ...
};
Options
You can pass eslint options.
Note that the config option you provide will be passed to the ESLint class.
This is a different set of options than what you'd specify in package.json or .eslintrc.
See the eslint docs for more details.
Warning: In eslint-webpack-plugin version 1 the options were passed to the now deprecated CLIEngine.
context
- Type:
String - Default:
compiler.context
A string indicating the root of your files.
eslintPath
- Type:
String - Default:
eslint
Path to eslint instance that will be used for linting. If the eslintPath is a folder like a official eslint, or specify a formatter option. now you dont have to install eslint.
extensions
- Type:
String|Array[String] - Default:
'js'
Specify extensions that should be checked.
exclude
- Type:
String|Array[String] - Default:
'node_modules'
Specify the files and/or directories to exclude. Must be relative to options.context.
files
- Type:
String|Array[String] - Default:
null
Specify directories, files, or globs. Must be relative to options.context.
Directories are traveresed recursively looking for files matching options.extensions.
File and glob patterns ignore options.extensions.
fix
- Type:
Boolean - Default:
false
Will enable ESLint autofix feature.
Be careful: this option will change source files.
formatter
- Type:
String|Function - Default:
'stylish'
Accepts a function that will have one argument: an array of eslint messages (object). The function must return the output as a string. You can use official eslint formatters.
lintDirtyModulesOnly
- Type:
Boolean - Default:
false
Lint only changed files, skip lint on start.
threads
- Type:
Boolean | Number - Default:
false
Will run lint tasks across a thread pool. The pool size is automatic unless you specify a number.
Errors and Warning
By default the plugin will auto adjust error reporting depending on eslint errors/warnings counts.
You can still force this behavior by using emitError or emitWarning options:
emitError
- Type:
Boolean - Default:
false
Will always return errors, if set to true.
emitWarning
- Type:
Boolean - Default:
false
Will always return warnings, if set to true.
failOnError
- Type:
Boolean - Default:
false
Will cause the module build to fail if there are any errors, if set to true.
failOnWarning
- Type:
Boolean - Default:
false
Will cause the module build to fail if there are any warnings, if set to true.
quiet
- Type:
Boolean - Default:
false
Will process and report errors only and ignore warnings, if set to true.
outputReport
- Type:
Boolean|Object - Default:
false
Write the output of the errors to a file, for example a checkstyle xml file for use for reporting on Jenkins CI.
The filePath is an absolute path or relative to the webpack config: output.path.
You can pass in a different formatter for the output file,
if none is passed in the default/configured formatter will be used.