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# ESLint 
[ESLint](https://eslint.org/) is a static analysis tool for Javascript code. ESLint covers both code quality and coding style issues.
## NPM
If you'd like to install it globally:
```bash
npm install -g eslint
```
If you'd like install it as a dev dependency of your project:
```bash
npm install eslint --save-dev
```
To generate a .eslintrc.* config file:
```
npx eslint --init
```
Done. See the ESLint [Getting Started](https://eslint.org/docs/user-guide/getting-started) guide for more info.
## Config
It lives under the `eslint` namespace and has the following configurable parameters:
```yaml
# grumphp.yml
grumphp:
tasks:
eslint:
bin: node_modules/.bin/eslint
triggered_by: [js, jsx, ts, tsx, vue]
whitelist_patterns:
- /^resources\/js\/(.*)/
config: .eslintrc.json
ignore_path: .eslintignore
debug: false
format: ~
max_warnings: ~
no_eslintrc: false
quiet: false
```
**bin**
*Default: null*
The path to your eslint bin executable. Not necessary if eslint is in your $PATH. Can be used to specify path to project's eslint over globally installed eslint.
**triggered_by**
*Default: [js, jsx, ts, tsx, vue]*
This is a list of extensions which will trigger the ESLint task.
**whitelist_patterns**
*Default: []*
This is a list of regex patterns that will filter files to validate. With this option you can specify the folders containing javascript files and thus skip folders like /tests/ or the /vendor/ directory. This option is used in conjunction with the parameter `triggered_by`.
For example: to whitelist files in `resources/js/` (Laravel's JS directory) and `assets/js/` (Symfony's JS directory) you can use:
```yaml
whitelist_patterns:
- /^resources\/js\/(.*)/
- /^assets\/js\/(.*)/
```
**config**
*Default: null*
The path to your eslint's configuration file. Not necessary if using a standard eslintrc name, eg. .eslintrc.json, .eslint.js, or .eslint.yml
**ignore_path**
*Default: null*
The path to your eslint's ignore file ([eslint.org](https://eslint.org/docs/user-guide/configuring/ignoring-code#using-an-alternate-file)). Not necessary if using standard .eslintignore name.
**debug**
*Default: false*
Turn on debug mode ([eslint.org](https://eslint.org/docs/user-guide/command-line-interface#debug)).
**format**
*Default: null*
Output format, eslint will use `stylish` by default. Other handy ones on cli are `compact`, `codeframe` and `table` (see full list on [eslint.org](https://eslint.org/docs/user-guide/formatters/)).
**max_warnings**
*Default: null*
Number of warnings (not errors) that are allowed before eslint exits with error status ([eslint.org](https://eslint.org/docs/user-guide/command-line-interface#max-warnings)).
**no_eslintrc**
*Default: false*
Set to true to ignore local .eslint config file ([eslint.org](https://eslint.org/docs/user-guide/command-line-interface#max-warnings)).
**quiet**
*Default: null*
Report errors only (no warnings). [eslint.org](https://eslint.org/docs/user-guide/command-line-interface#quiet)
**other settings**
Any other eslint settings (such as rules, env, ignore patterns, etc.) should be able to be set through an [eslint config file](https://eslint.org/docs/user-guide/configuring) (instructions to generate a config file at top of document).