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# Pronto runner for ESLint (using eslint from npm)
[](https://codeclimate.com/github/doits/pronto-eslint_npm)
[](https://travis-ci.org/doits/pronto-eslint_npm)
[](http://badge.fury.io/rb/pronto-eslint_npm)
[](https://gemnasium.com/doits/pronto-eslint_npm)
Pronto runner for [ESlint](http://eslint.org), pluggable linting utility for JavaScript and JSX. [What is Pronto?](https://github.com/mmozuras/pronto)
Uses official eslint executable installed by `npm` in contrast to [pronto-eslint][pronto-eslint].
[pronto-eslint]: https://github.com/mmozuras/pronto-eslint
## Prerequisites
You'll need to install [eslint by yourself with npm][eslint-install]. If `eslint` is in your `PATH`, everything will simply work, otherwise you have to provide pronto-eslint-npm your custom executable path (see [below](#configuration-of-eslintnpm)).
[eslint-install]: http://eslint.org/docs/user-guide/getting-started
## Configuration of ESLint
Configuring ESLint via [.eslintrc and consorts][eslintrc] and excludes via [.eslintignore][eslintignore] will work just fine with pronto-eslint-npm.
[eslintrc]: http://eslint.org/docs/user-guide/configuring#configuration-file-formats
[eslintignore]: http://eslint.org/docs/user-guide/configuring#ignoring-files-and-directories
## Configuration of ESLintNPM
pronto-eslint-npm can be configured by placing a `.pronto_eslint_npm.yml` inside the directory where pronto is run.
Following options are available:
| Option | Meaning | Default |
| ----------------- | ---------------------------------------------------------------------------------------- | ----------------------------------- |
| eslint_executable | ESLint executable to call. | `eslint` (calls `eslint` in `PATH`) |
| files_to_lint | What files to lint. Absolute path of offending file will be matched against this Regexp. | `(\.js|\.es6)$` |
Example configuration to call custom eslint executable and only lint files ending with `.my_custom_extension`:
```yaml
# .pronto_eslint_npm.yaml
eslint_executable: '/my/custom/node/path/.bin/eslint'
files_to_lint: '\.my_custom_extension$'
```
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