chore: init vaadin-web-components monorepo

Author: web-padawan

.eslintignore

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+packages/**/vendor/*.js
+packages/**/dist/*.js

.eslintrc.json

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+{
+  "extends": [
+    "eslint:recommended",
+    "plugin:prettier/recommended"
+  ],
+  "plugins": ["prettier"],
+  "env": {
+    "browser": true,
+    "es6": true
+  },
+  "parserOptions": {
+    "sourceType": "module",
+    "ecmaVersion": 2020
+  }
+}

.github/workflows/chrome.yml

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+name: Chrome
+
+on: pull_request
+
+jobs:
+  tests:
+    name: Unit tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: "0"
+
+      - name: Setup Node 14.x
+        uses: actions/setup-node@v2
+        with:
+          node-version: 14.x
+
+      - uses: actions/cache@v2
+        with:
+          path: |
+            node_modules
+            */*/node_modules
+          key: ${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
+
+      - name: Install Dependencies
+        run: yarn --frozen-lockfile --no-progress --non-interactive
+
+      - name: Lint
+        run: yarn lint
+
+      - name: Test
+        run: yarn test

.github/workflows/firefox.yml

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+name: Firefox
+
+on: pull_request
+
+jobs:
+  tests:
+    name: Unit tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: "0"
+
+      - name: Setup Node 14.x
+        uses: actions/setup-node@v2
+        with:
+          node-version: 14.x
+
+      - name: Set environment variables
+        run: echo "PLAYWRIGHT_BROWSERS_PATH=$HOME/.playwright" >> $GITHUB_ENV
+
+      - uses: actions/cache@v2
+        with:
+          path: |
+            node_modules
+            */*/node_modules
+            ${{ env.PLAYWRIGHT_BROWSERS_PATH }}
+          key: ${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
+
+      - uses: microsoft/playwright-github-action@v1
+
+      - name: Install Dependencies
+        run: yarn --frozen-lockfile --no-progress --non-interactive
+
+      - name: Test
+        run: yarn test:firefox

.github/workflows/webkit.yml

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+name: WebKit
+
+on: pull_request
+
+jobs:
+  tests:
+    name: Unit tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: "0"
+
+      - name: Setup Node 14.x
+        uses: actions/setup-node@v2
+        with:
+          node-version: 14.x
+
+      - name: Set environment variables
+        run: echo "PLAYWRIGHT_BROWSERS_PATH=$HOME/.playwright" >> $GITHUB_ENV
+
+      - uses: actions/cache@v2
+        with:
+          path: |
+            node_modules
+            */*/node_modules
+            ${{ env.PLAYWRIGHT_BROWSERS_PATH }}
+          key: ${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
+
+      - uses: microsoft/playwright-github-action@v1
+
+      - name: Install Dependencies
+        run: yarn --frozen-lockfile --no-progress --non-interactive
+
+      - name: Test
+        run: yarn test:webkit

.gitignore

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+node_modules
+coverage
+packages/**/analysis.json
+packages/**/dist

.prettierrc

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+{
+  "singleQuote": true,
+  "printWidth": 120,
+  "trailingComma": "none",
+  "htmlWhitespaceSensitivity": "strict"
+}

.stylelintrc

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+{
+  "extends": [
+    "stylelint-config-vaadin",
+    "stylelint-config-prettier"
+  ]
+}

README.md

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+# Vaadin web components
+
+This is a monorepo powered by [Lerna](https://github.com/lerna/lerna) that includes all Vaadin web components.
+
+## Setup
+
+```sh
+yarn
+```
+
+## Run all tests in Chrome
+
+```sh
+yarn test
+```
+
+Note: this and following scripts only run tests for packages changed since `origin/master` branch.
+
+## Run all tests in Firefox
+
+```sh
+yarn test:firefox
+```
+
+## Run all tests in WebKit
+
+```sh
+yarn test:webkit
+```
+
+## Run tests for single package
+
+```sh
+yarn test --group vaadin-upload
+```
+
+## LICENSE
+
+For specific package(s), check the LICENSE file under the package folder.

lerna.json

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+{
+  "packages": [
+    "packages/*"
+  ],
+  "npmClient": "yarn",
+  "useWorkspaces": true,
+  "version": "20.0.0-alpha0"
+}