Replace npm with yarn; add CI workflow to run TSC and tslint checks

.github/workflows/check.yml

@@ -0,0 +1,41 @@
+name: Check
+
+on: push
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Use Node.js 14.x
+        uses: actions/setup-node@v2
+        with:
+          node-version: 14.x
+
+      - name: Get Node.js version
+        id: get-node-version
+        run: echo "::set-output name=node-version::$(node --version)"
+
+      - name: Install Yarn
+        if: ${{ env.ACT }}
+        run: npm install yarn --global
+
+      - name: Get yarn cache directory path
+        id: get-yarn-cache-path
+        run: |
+          yarn cache dir
+          echo "::set-output name=yarn-cache-path::$(yarn cache dir)"
+
+      - uses: actions/cache@v2
+        id: yarn-cache
+        with:
+          path: ${{ steps.get-yarn-cache-path.outputs.yarn-cache-path }}
+          key: ${{ runner.os }}_node-${{ steps.get-node-version.outputs.node-version }}_yarn-${{ hashFiles('**/yarn.lock') }}
+
+      - name: 📦 Install Dependencies
+        run: yarn install --frozen-lockfile
+
+      - name: 🔍 Check
+        run: yarn run check

README.md

@@ -44,9 +44,10 @@ See [issues](https://github.com/whyboris/Video-Hub-App/issues) for what is in pr
 
 How to start:
 
-- `npm install` to install
-- `npm start` to develop
-- `npm run electron` to build
+- `npm install -g yarn` to install yarn globally
+- `yarn install` to install
+- `yarn start` to develop
+- `yarn run electron` to build
 
 Main dependencies in use:
 

demo/README.md

@@ -2,7 +2,7 @@
 
 This folder contains files for showing a web preview of the app.
 
-First build the app (`npm run build`) with the web-demo flag `webDemo` set to `true` (in `home.component.ts`). This should populate the `/dist` folder with `index.html`. 
+First build the app (`yarn run build`) with the web-demo flag `webDemo` set to `true` (in `home.component.ts`). This should populate the `/dist` folder with `index.html`. 
 
 Now when you open the `index.html` within this folder, you should see a web version of the app with sample demo content.