GitHub actions and eslint config - warning only for now (#3723)

* first step with eslint and github actions build

* warnings only

.eslintignore

@@ -0,0 +1,2 @@
+.eslintrc.js
+dist

.eslintrc.js

@@ -0,0 +1,24 @@
+module.exports = {
+	"env": {
+		"browser": true,
+		"es2021": true
+	},
+	globals: {
+		'luxon': 'readonly',
+		'XLSX': 'readonly',
+		'jspdf': 'readonly'
+	},
+	"extends": "eslint:recommended",
+	"parserOptions": {
+		"ecmaVersion": "latest",
+		"sourceType": "module"
+	},
+	"plugins": ["only-warn"],
+	"rules": {
+		"semi": "error",
+		"indent": ["error", "tab"],
+		"no-unused-vars": ["warn", { "vars": "all", "args": "none", "ignoreRestSiblings": false }],
+		"no-fallthrough": "off",
+		"no-inner-declarations": "off",
+	}
+}

.github/workflows/bad-files-check.yml

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+name: Bad files check
+on:
+  pull_request:
+
+jobs:
+  check:
+    name: Dist check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out Git repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+
+      - name: Get specific changed files in dist
+        id: changed-files-specific
+        uses: tj-actions/changed-files@v17.3
+        with:
+          files: |
+            dist
+
+      - name: Check file existence
+        id: check_files
+        uses: andstor/file-existence-action@v1
+        with:
+          files: "yarn.lock"
+
+      - name: Fail if dist files changed
+        if: steps.changed-files-specific.outputs.any_changed == 'true'
+        run: |
+          echo "Oops! Looks like you modified some files in dist/. Please remove them from your PR, thanks!"
+          exit 1
+
+      - name: Fail if yarn lock exists
+        if: steps.check_files.outputs.files_exists == 'true'
+        run: |
+          echo "Oops! Looks like you checked in a yarn.lock file, we use npm and package-lock.json. Please remove it from your PR, thanks!"
+          exit 1

.github/workflows/lint-and-test.yml

@@ -0,0 +1,31 @@
+name: Lint and build
+on:
+  # Trigger the workflow on push or pull request,
+  # but only for the main branch
+  push:
+    branches:
+      - main
+      - master
+  pull_request:
+
+jobs:
+  linting:
+    name: Linting
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out Git repository
+        uses: actions/checkout@v2
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: 14
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Build
+        run: npm run build