Lint Fluent Reference Files workflow (mozilla/pdf.js)

The Lint Fluent Reference Files workflow from mozilla/pdf.js, explained and optimized by Latchkey.

What it does

This is the Lint Fluent Reference Files workflow from the mozilla/pdf.js repository, a real project running GitHub Actions. It is shown here with attribution under its Apache-2.0 license.

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

The workflow

name: Lint Fluent Reference Files
on:
  push:
    paths:
      - 'l10n/en-US/**.ftl'
      - '.github/fluent_linter_config.yml'
      - '.github/workflows/fluent_linter.yml'
    branches:
      - master
  pull_request:
    paths:
      - 'l10n/en-US/**.ftl'
      - '.github/fluent_linter_config.yml'
      - '.github/workflows/fluent_linter.yml'
    branches:
      - master
  workflow_dispatch:
permissions:
  contents: read

jobs:
  lint:
    name: Lint
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false

      - name: Use Python 3.14
        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
        with:
          python-version: '3.14'
          cache: 'pip'
          cache-dependency-path: '.github/fluent_linter_requirements.txt'

      - name: Install requirements
        run: pip install -r .github/fluent_linter_requirements.txt

      - name: Lint Fluent reference files
        run: moz-fluent-lint ./l10n/en-US --config .github/fluent_linter_config.yml

The same workflow, on Latchkey

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

name: Lint Fluent Reference Files
on:
  push:
    paths:
      - 'l10n/en-US/**.ftl'
      - '.github/fluent_linter_config.yml'
      - '.github/workflows/fluent_linter.yml'
    branches:
      - master
  pull_request:
    paths:
      - 'l10n/en-US/**.ftl'
      - '.github/fluent_linter_config.yml'
      - '.github/workflows/fluent_linter.yml'
    branches:
      - master
  workflow_dispatch:
permissions:
  contents: read
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  lint:
    timeout-minutes: 30
    name: Lint
    runs-on: latchkey-small
 
    steps:
      - name: Checkout repository
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
 
      - name: Use Python 3.14
        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
        with:
          python-version: '3.14'
          cache: 'pip'
          cache-dependency-path: '.github/fluent_linter_requirements.txt'
 
      - name: Install requirements
        run: pip install -r .github/fluent_linter_requirements.txt
 
      - name: Lint Fluent reference files
        run: moz-fluent-lint ./l10n/en-US --config .github/fluent_linter_config.yml
 

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.
• Cancel superseded runs when a branch or PR gets a newer push.
• 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