Update GitHub Actions workflow

.github/workflows/test.yml

@@ -1,5 +1,3 @@
-# This is a basic workflow to help you get started with Actions
-
 name: CI
 
 # Controls when the action will run. Triggers the workflow on push or pull request
@@ -14,17 +12,54 @@ jobs:
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
-    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-    - uses: actions/checkout@v2
-    
-    - name: Setup Node.js environment
-      uses: actions/setup-node@v1
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v3
 
-    - name: Install dependencies
-      run: npm ci
+      - name: Setup Node.js environment
+        uses: actions/setup-node@v3
+        with:
+          node-version: lts/*
 
-    - name: Run tests
-      run: npm test
+      # Re-use node_modules between runs until package-lock.json changes.
+      - name: Cache node_modules
+        id: internal-cache-node_modules
+        uses: actions/cache@v3
+        with:
+          path: node_modules
+          key: internal-node_modules-ubuntu-latest.x-${{ hashFiles('package-lock.json') }}
+
+      # Re-use ~/.elm between runs until elm.json, elm-tooling.json or
+      # review/elm.json changes. The Elm compiler saves downloaded Elm packages
+      # to ~/.elm, and elm-tooling saves downloaded tool executables there.
+      - name: Cache ~/.elm
+        uses: actions/cache@v3
+        with:
+          path: ~/.elm
+          key: elm-${{ hashFiles('elm.json', 'elm-tooling.json', 'review/elm.json') }}
+
+      - name: Install npm dependencies
+        if: steps.cache-node_modules.outputs.cache-hit != 'true'
+        env:
+          # If you have a `"postinstall": "elm-tooling install"` script in your
+          # package.json, this turns it into a no-op. We’ll run it in the next
+          # step because of the caching. If elm-tooling.json changes but
+          # package-lock.json does not, the postinstall script needs running
+          # but this step won’t.
+          NO_ELM_TOOLING_INSTALL: 1
+        run: npm ci
+
+      # Install tools from elm-tooling.json, unless we restored them from
+      # cache. package-lock.json and elm-tooling.json can change independently,
+      # so we need to install separately based on what was restored from cache.
+      # This is run even if we restored ~/.elm from cache to be 100% sure
+      # node_modules/.bin/ contains links to all your tools. `elm-tooling
+      # install` runs very fast when there’s nothing new to download so
+      # skipping the step doesn’t save much time.
+      - name: elm-tooling install
+        run: npx --no-install elm-tooling install
+
+      - name: Run tests
+        run: npm test
 
   publish:
     needs: [test] # make sure all your other jobs succeed before trying to publish
@@ -35,17 +70,62 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Setup Node.js environment
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v3
+        with:
+          node-version: lts/*
 
-      - name: Install dependencies
+      # Re-use node_modules between runs until package-lock.json changes.
+      - name: Cache node_modules
+        id: internal-cache-node_modules
+        uses: actions/cache@v3
+        with:
+          path: node_modules
+          key: internal-node_modules-ubuntu-latest.x-${{ hashFiles('package-lock.json') }}
+
+      # Re-use ~/.elm between runs until elm.json, elm-tooling.json or
+      # review/elm.json changes. The Elm compiler saves downloaded Elm packages
+      # to ~/.elm, and elm-tooling saves downloaded tool executables there.
+      - name: Cache ~/.elm
+        uses: actions/cache@v3
+        with:
+          path: ~/.elm
+          key: elm-${{ hashFiles('elm.json', 'elm-tooling.json', 'review/elm.json') }}
+
+      - name: Install npm dependencies
+        if: steps.cache-node_modules.outputs.cache-hit != 'true'
+        env:
+          # If you have a `"postinstall": "elm-tooling install"` script in your
+          # package.json, this turns it into a no-op. We’ll run it in the next
+          # step because of the caching. If elm-tooling.json changes but
+          # package-lock.json does not, the postinstall script needs running
+          # but this step won’t.
+          NO_ELM_TOOLING_INSTALL: 1
         run: npm ci
 
+      # Install tools from elm-tooling.json, unless we restored them from
+      # cache. package-lock.json and elm-tooling.json can change independently,
+      # so we need to install separately based on what was restored from cache.
+      # This is run even if we restored ~/.elm from cache to be 100% sure
+      # node_modules/.bin/ contains links to all your tools. `elm-tooling
+      # install` runs very fast when there’s nothing new to download so
+      # skipping the step doesn’t save much time.
+      - name: elm-tooling install
+        run: npx --no-install elm-tooling install
+
+      - name: Check if package needs to be published
+        uses: dillonkearns/elm-publish-action@v1
+        id: publish
+        with:
+          dry-run: true
+          path-to-elm: ./node_modules/.bin/elm
+
       # Runs a single command using the runners shell
       - name: Elm Publish
-        uses: dillonkearns/elm-publish-action@master
+        if: steps.publish.outputs.is-publishable == 'true'
+        uses: dillonkearns/elm-publish-action@v1
         with:
           # Token provided by GitHub
           github-token: ${{ secrets.GITHUB_TOKEN }}