chore: cache dependencies

.github/workflows/test.yml

@@ -4,19 +4,49 @@ on: [push, pull_request]
 
 jobs:
   build:
-
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
 
     strategy:
       matrix:
-        node-version: [14.x, 16.x]
+        node-version: [14.x]
+        os: [ubuntu-latest]
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
-      with:
-        node-version: ${{ matrix.node-version }}
-    - run: npm i -g yarn
-    - run: yarn
-    - run: yarn prerelease
+      - uses: actions/checkout@v2
+
+      # install node
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      # install yarn
+      - run: npm i -g yarn
+
+      # https://github.com/actions/cache/blob/main/examples.md#node---yarn
+      - name: Get yarn cache directory path
+        id: yarn-cache-dir-path
+        run: echo "::set-output name=dir::$(yarn cache dir)"
+
+      - name: Cache yarn cache dir
+        uses: actions/cache@v2
+        id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
+        with:
+          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-
+
+      # https://github.com/actions/cache/blob/main/examples.md#node---lerna
+      - name: Cache node_modules
+        uses: actions/cache@v2
+        with:
+          path: |
+            node_modules
+            */*/node_modules
+          key: ${{ runner.os }}-node_modules-${{ hashFiles('**/yarn.lock') }}
+
+      - run: yarn
+      - run: yarn build
+      - run: yarn pretest
+      - run: yarn test