Autofix Lint workflow (sveltejs/svelte)

The Autofix Lint workflow from sveltejs/svelte, explained and optimized by Latchkey.

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Source: sveltejs/svelte.github/workflows/autofix.ymlLicense MITView source

What it does

This is the Autofix Lint workflow from the sveltejs/svelte repository, a real project running GitHub Actions. It is shown here with attribution under its MIT license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

workflow (.yml)

name: Autofix Lint

on:
  issue_comment:
    types: [created]
  workflow_dispatch:

permissions: {}

jobs:
  autofix-lint:
    permissions:
      contents: write # to push the generated types commit
      pull-requests: read # to resolve the PR head ref
    # prevents this action from running on forks
    if: |
      github.repository == 'sveltejs/svelte' &&
      (
        github.event_name == 'workflow_dispatch' ||
        (
          github.event.issue.pull_request != null &&
          github.event.comment.body == '/autofix' &&
          contains(fromJSON('["OWNER", "MEMBER", "COLLABORATOR"]'), github.event.comment.author_association)
        )
      )
    runs-on: ubuntu-latest
    steps:
      - name: Get PR ref
        if: github.event_name != 'workflow_dispatch'
        id: pr
        uses: actions/github-script@v8
        with:
          script: |
            const { data: pull } = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number
            });
            if (pull.head.repo.full_name !== `${context.repo.owner}/${context.repo.repo}`) {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body: 'Cannot autofix: this PR is from a forked repository. The autofix workflow can only push to branches within this repository.'
              });
              core.setFailed('PR is from a fork');
            }
            core.setOutput('ref', pull.head.ref);
      - uses: actions/checkout@v6
        if: github.event_name == 'workflow_dispatch' || steps.pr.outcome == 'success'
        with:
          ref: ${{ github.event_name == 'workflow_dispatch' && github.ref || steps.pr.outputs.ref }}
      - uses: pnpm/action-setup@b906affcce14559ad1aafd4ab0e942779e9f58b1 # v4.3.0
      - uses: actions/setup-node@v6
        with:
          node-version: 24
          cache: pnpm
      - run: pnpm install --frozen-lockfile
      - name: Build
        run: pnpm -F svelte build
      - name: Run prettier
        run: pnpm format
      - name: Commit changes
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add -A
          git diff --staged --quiet || git commit -m "chore: autofix"
          git push origin HEAD

The same workflow, on Latchkey

Removes redundant runs and caps runaway jobs. Added and changed lines are highlighted.

name: Autofix Lint
 
on:
  issue_comment:
    types: [created]
  workflow_dispatch:
 
permissions: {}
 
jobs:
  autofix-lint:
    timeout-minutes: 30
    permissions:
      contents: write # to push the generated types commit
      pull-requests: read # to resolve the PR head ref
    # prevents this action from running on forks
    if: |
      github.repository == 'sveltejs/svelte' &&
      (
        github.event_name == 'workflow_dispatch' ||
        (
          github.event.issue.pull_request != null &&
          github.event.comment.body == '/autofix' &&
          contains(fromJSON('["OWNER", "MEMBER", "COLLABORATOR"]'), github.event.comment.author_association)
        )
      )
    runs-on: latchkey-small
    steps:
      - name: Get PR ref
        if: github.event_name != 'workflow_dispatch'
        id: pr
        uses: actions/github-script@v8
        with:
          script: |
            const { data: pull } = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number
            });
            if (pull.head.repo.full_name !== `${context.repo.owner}/${context.repo.repo}`) {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body: 'Cannot autofix: this PR is from a forked repository. The autofix workflow can only push to branches within this repository.'
              });
              core.setFailed('PR is from a fork');
            }
            core.setOutput('ref', pull.head.ref);
      - uses: actions/checkout@v6
        if: github.event_name == 'workflow_dispatch' || steps.pr.outcome == 'success'
        with:
          ref: ${{ github.event_name == 'workflow_dispatch' && github.ref || steps.pr.outputs.ref }}
      - uses: pnpm/action-setup@b906affcce14559ad1aafd4ab0e942779e9f58b1 # v4.3.0
      - uses: actions/setup-node@v6
        with:
          node-version: 24
          cache: pnpm
      - run: pnpm install --frozen-lockfile
      - name: Build
        run: pnpm -F svelte build
      - name: Run prettier
        run: pnpm format
      - name: Commit changes
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add -A
          git diff --staged --quiet || git commit -m "chore: autofix"
          git push origin HEAD

What changed

Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
Add a job timeout so a hung step cannot burn hours of runner time.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

Dependency installs

This workflow runs 1 job per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow

actions/github-script actions/checkout pnpm/action-setup actions/setup-node