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eslint-plus-action





A flexible and dead simple Github Action which runs ESLint against the changed files in a PR with customizable options and rich summaries. ESLint issues are annotated inline on your PR diff.








semantic-release lint

Dead Simple

As easy as the following, and even the more advanced features are just a few extra lines.

name: "my-workflow"
on: [pull_request]

jobs:
  eslint:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - uses: bradennapier/[email protected]

Features

The summary comments have some redundancy when there are suggestions available. This will be improved.

The fix property is not yet setup but will come shortly. If fixes are available, it will render an action button to run the fix as well.

Configuration

You provide configuration properties within your workflow by using the with property. See the Simple Workflow Example for an example of providing your github-token.

array types are expected to be comma-separated values

General Configuration Properties

Property Type Default Required Description
github-token string secrets.GITHUB_TOKEN false Your Github token. You only need to provide this if you want to use something other than secrets.GITHUB_TOKEN
issueSummary boolean true false Should the bot provide a summary of the results as a comment?
issueSummaryType string compact false Changes the PR comment to be "full" (as shown on actions page) or "compact"
issueSummaryMethod string edit false When issueSummary is enabled, allows having the bot edit or refresh the comment on each new push, can be 'edit' or 'refresh'
issueSummaryOnlyOnEvent boolean false false Only provide the issue summary comment if there are warnings or errors present?
annotateWarnings boolean true false By setting this to "false", only errors will be annotated
reportSuggestions boolean true false Report suggestions when available within the annotations?
reportIgnoredFiles boolean false false Report a list of any ignored files?
reportWarningsAsErrors boolean false false Report any eslint warnings as errors?
extensions array .js,.jsx,.ts,.tsx false An array of extensions to lint
includeGlob array **/* false Optional array of globs to include from the changed files list
ignoreGlob array none false Optional array of globs to ignore from the changed files list
configFile string none false A config file to use if the default config resolution doesn't work.
rulePaths array none false Optional paths to custom rules directories to include.
errorOnUnmatchedPattern boolean false false Throw error if unmatched pattern is seen?
useEslintrc boolean true false Use eslintrc?
useEslintIgnore boolean true false Use eslintignore?
fix boolean false false Commit fixes when possible (UNFINISHED)
npmInstall boolean false false Force run npm ci (or yarn) for you. If you do not use this option, be sure to install the project dependencies before running this action. By default it will run if a node_modules directory is not found or this is set to true

The official settings can always be seen by viewing the action.yml schema for the action.

Handle Forked PRs

GitHub Actions only have read permissions when a forked PR is opened. However, we can work around this by setting up a scheduled job in our workflow. This runs at your given interval and will automatically enable serialization of results as workflow artifacts when required. Since these will always run against our master branch, we can safely run our results without concern that the fork has modified the workflow in any way which may be malicious.

Each time the schedule job runs it will run through any new artifacts and update the PR with the results like normal. If a job hasn't been detected in the last 24 hours then the action will no longer save artifacts. This is so you do not needlessly use up your data storage.

Note that we delete the artifacts as soon as they have been processed so they will not use up your storage for very long.

You can optionally add additional optimization by also making sure to run this action on the [closed] event so that we can cleanup all the artifacts when this occurs.


The scheduler will not start running until you have pushed the workflow to your main branch (master). If it still does not run you can try pushing an empty commit, it seems that is sometimes required git commit --allow-empty -m 'redeploy schedule action'

name: "lint"
on: 
  # by adding a schedule task to this workflow we will automatically
  # begin serializing read-only runs and handling them. The cron job
  # below is set to run every 15 minutes, GitHub will ignore anything
  # under 10 minutes and run every 10 minutes anyway.
  schedule:
    - cron: '*/15 * * * *'
  pull_request:
    types:
      - opened
      - synchronize
      - closed
jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - uses: bradennapier/[email protected]

Examples

Simple Workflow Example

Below is a basic example which should get you going. You can view the action.yml to see what other properties are available for customization.

name: "my-workflow"
on: [pull_request]

jobs:
  eslint:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - uses: bradennapier/[email protected]

Environment Variables

There may be times that you need to provide a NPM_TOKEN so that the action can install your private repos. You do this by adding the secret to your repo Settings -> Secrets then providing it as an environment variable to the action:

jobs:
  eslint:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - uses: bradennapier/[email protected]
      env:
        NPM_TOKEN: ${{secrets.NPM_TOKEN}}

Providing Parameters

jobs:
  eslint:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - uses: bradennapier/[email protected]
      env:
        NPM_TOKEN: ${{secrets.NPM_TOKEN}}
      with: 
        issueSummaryType: full
        reportIgnoredFiles: true

More Previews

Credits

This action was adapted from other actions which didn't quite work for me but were close. So special thanks to them for helping me get here.