chore(test): action cache (#2634)

* yarn lock not json
* dont dup key
* prefer-offline

Author: jamesdaniels

.github/workflows/test.yml

@@ -17,14 +17,13 @@ jobs:
     - uses: actions/cache@v2
       with:
         path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
-        key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.json') }}
+        key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
         restore-keys: |
-          ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.json') }}
           ${{ runner.os }}-yarn-
           ${{ runner.os }}-
     - name: yarn test
       run: |
-        yarn install --frozen-lockfile
+        yarn install --frozen-lockfile --prefer-offline
         yarn lint
         yarn build
         yarn test:all

tools/run-typings-test.js

@@ -35,7 +35,7 @@ ncp(pathToTestSrcFolder, pathToTestFolder, () => {
     .replace('{{TYPESCRIPT_VERSION}}', rootPackage.devDependencies.typescript)
     .replace(/\{\{ANGULAR_VERSION\}\}/g, rootPackage.dependencies['@angular/core']));
 
-    spawnIt('yarn', ['install'])
+    spawnIt('yarn', ['install', '--prefer-offline'])
       .then(_ => spawnIt(`${pathToTestFolder}/node_modules/.bin/tsc`, ['--version']))
       .then(_ => new Promise((res, rej) => {
         child_process.exec(`${pathToTestFolder}/node_modules/.bin/tsc --diagnostics -p ${pathToTestFolder}/tsconfig-test.json`, (err, stdout, stderr) => {