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GitHub Action

Lint Action

v1.7.0

Lint Action

check

Lint Action

GitHub Action for detecting and fixing linting errors

Installation

Copy and paste the following snippet into your .yml file.

              

- name: Lint Action

uses: wearerequired/lint-action@v1.7.0

Learn more about this action in wearerequired/lint-action

Choose a version

✨ Lint Action

Note: The behavior of actions like this one is currently limited in the context of forks. See Limitations.

Screenshots

  • Checks on pull requests:

    Screenshot of check runs
  • Commit annotations:

    Screenshot of ESLint annotations

Supported tools

Usage

Create a new GitHub Actions workflow in your project, e.g. at .github/workflows/lint.yml. The content of the file should be in the following format:

name: Lint

on: push

jobs:
  run-linters:
    name: Run linters
    runs-on: ubuntu-latest

    steps:
      - name: Check out Git repository
        uses: actions/checkout@v2

      # Install your linters here

      - name: Run linters
        uses: wearerequired/lint-action@v1
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          # Enable your linters here

Examples

All linters are disabled by default. To enable a linter, simply set the option with its name to true, e.g. eslint: true.

The action doesn't install the linters for you; you are responsible for installing them in your CI environment.

JavaScript example (ESLint and Prettier)

name: Lint

on: push

jobs:
  run-linters:
    name: Run linters
    runs-on: ubuntu-latest

    steps:
      - name: Check out Git repository
        uses: actions/checkout@v2

      - name: Set up Node.js
        uses: actions/setup-node@v1
        with:
          node-version: 12

      # ESLint and Prettier must be in `package.json`
      - name: Install Node.js dependencies
        run: npm install

      - name: Run linters
        uses: wearerequired/lint-action@v1
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          # Enable linters
          eslint: true
          prettier: true

PHP example (PHP_CodeSniffer)

name: Lint

on: push

jobs:
  run-linters:
    name: Run linters
    runs-on: ubuntu-latest

    steps:
      - name: Check out Git repository
        uses: actions/checkout@v2

      - name: Set up PHP
        uses: shivammathur/setup-php@v2
        with:
          php-version: "7.4"
          coverage: none
          tools: phpcs

      - name: Run linters
        uses: wearerequired/lint-action@v1
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          # Enable linters
          php_codesniffer: true
          # Optional: Ignore warnings
          php_codesniffer_args: "-n"

If you prefer to use Composer you can also use this:

name: Lint

on: push

jobs:
  run-linters:
    name: Run linters
    runs-on: ubuntu-latest

    steps:
      - name: Check out Git repository
        uses: actions/checkout@v2

      - name: Set up PHP
        uses: shivammathur/setup-php@v2
        with:
          php-version: "7.4"
          coverage: none
          tools: composer

      - name: Install PHP dependencies
        run: |
          composer install --prefer-dist --no-suggest --no-progress --no-ansi --no-interaction
          echo "${PWD}/vendor/bin" >> $GITHUB_PATH

      - name: Run linters
        uses: wearerequired/lint-action@v1
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          # Enable linters
          php_codesniffer: true

Python example (Flake8 and Black)

name: Lint

on: push

jobs:
  run-linters:
    name: Run linters
    runs-on: ubuntu-latest

    steps:
      - name: Check out Git repository
        uses: actions/checkout@v2

      - name: Set up Python
        uses: actions/setup-python@v1
        with:
          python-version: 3.8

      - name: Install Python dependencies
        run: pip install black flake8

      - name: Run linters
        uses: wearerequired/lint-action@v1
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          # Enable linters
          black: true
          flake8: true

Configuration

Linter-specific options

[linter] can be one of black, eslint, flake8, gofmt, golint, mypy, php_codesniffer, prettier, rubocop, stylelint, swift_format_official, swift_format_lockwood, swiftlint and xo:

  • [linter]: Enables the linter in your repository. Default: false
  • [linter]_args: Additional arguments to pass to the linter. Example: eslint_args: "--max-warnings 0" if ESLint checks should fail even if there are no errors and only warnings. Default: ""
  • [linter]_dir: Directory where the linting command should be run. Example: eslint_dir: server/ if ESLint is installed in the server subdirectory. Default: Repository root
  • [linter]_extensions: Extensions of files to check with the linter. Example: eslint_extensions: js,ts to lint JavaScript and TypeScript files with ESLint. Default: Varies by linter, see action.yml
  • [linter]_command_prefix: Command prefix to be run before the linter command. Default: "".

General options

  • github_token: The GITHUB_TOKEN to authenticate on behalf of GitHub Actions.

  • continue_on_error: Whether the workflow run should also fail when linter failures are detected. Default: true

  • auto_fix: Whether linters should try to fix code style issues automatically. If some issues can be fixed, the action will commit and push the changes to the corresponding branch. Default: false

    Screenshot of auto-fix commit

  • git_name: Username for auto-fix commits. Default: "Lint Action"

  • git_email: Email address for auto-fix commits. Default: "lint-action@samuelmeuli.com"

  • commit_message: Template for auto-fix commit messages. The ${linter} variable can be used to insert the name of the linter. Default: "Fix code style issues with ${linter}"

  • check_name: Template for the name of the check run. Use this to ensure unique names when the action is used more than once in a workflow. The ${linter} and ${dir} variables can be used to insert the name and directory of the linter. Default: "${linter}"

Linter support

Some options are not be available for specific linters:

Linter auto-fixing extensions
black
eslint
flake8
gofmt ❌ (go)
golint ❌ (go)
mypy
php_codesniffer
prettier
rubocop ❌ (rb)
stylelint
swift_format_official
swift_format_lockwood ❌ (swift)
swiftlint ❌ (swift)
xo

Limitations

There are currently some limitations as to how this action (or any other action) can be used in the context of pull_request events from forks:

  • The action doesn't have permission to push auto-fix changes to the fork. This is because the pull_request event runs on the upstream repo, where the github_token is lacking permissions for the fork. Source
  • The action doesn't have permission to create annotations for commits on forks and can therefore not display linting errors. Source 1, source 2

For details and comments, please refer to #13.


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