lint.yml

name: Lint JavaScript

on:
    pull_request:
        types: [opened, synchronize]

jobs:
    lint:
        runs-on: ubuntu-latest
        steps:
            - uses: actions/checkout@v2

            - uses: actions/cache@v2
              with:
                  path: ~/.yarn
                  key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
                  restore-keys: |
                      ${{ runner.os }}-yarn-

            - name: Setup Node
              uses: actions/setup-node@v1
              with:
                  node-version: "16.x"

            - name: Install node_modules
              run: yarn install --immutable

            - name: Verify there's no Prettier diff
              run: |
                yarn lint --fix --quiet
                if ! git diff --name-only --exit-code; then
                    # shellcheck disable=SC2016
                    echo 'Error: Prettier diff detected! Please run `yarn lint --fix` and commit the changes.'
                    exit 1
                fi