cache-node-modules.yml

name: cache-node-modules
on: pull_request
jobs:
    cache-node-modules:
        runs-on: ubuntu-latest
        steps:
            - name: Checkout repo
              uses: actions/checkout@v2
            # Looks for changes to the `yarn.lock` file, though it could just
            # as easily look for changes in `package-lock.json` file, if you
            # are using npm instead of yarn.
            #
            # If `yarn.lock` has changed, it will reinstall dependencies and
            # cache them for later.
            #
            # If `yarn.lock` has not changed, it will just reuse the existing
            # installed dependencies in `node_modules`.
            - name: Cache node_modules
              id: node-modules-cache
              uses: actions/cache@v2
              with:
                  path: '**/node_modules'
                  key: node-modules-cache-${{ hashFiles('**/yarn.lock') }}
            - name: Install dependencies
              if: steps.node-modules-cache.outputs.cache-hit != 'true'
              run: yarn install --frozen-lockfile