feat(style): Introduce Prettier for automated code style enforcement

.eslintrc.cjs

@@ -1,50 +1,44 @@
 module.exports = {
-  env: {
-    browser: true,
-    node: true
-  },
-  extends: [
-    'prettier',
-    'prettier/@typescript-eslint'
-  ],
-  parser: '@typescript-eslint/parser',
-  parserOptions: {
-    sourceType: 'module'
-  },
-  plugins: ['@typescript-eslint'],
-  rules: {
-    'no-restricted-syntax': [
-      'warn',
-      {
-        selector: 'AwaitExpression',
-        message: 'Use Promise chains (.then/.catch) instead of async/await'
-      }
-    ],
-    // Disabled due to existing violations. See issue #334
-    curly: 'off',
-    eqeqeq: 'off',
-    'no-redeclare': 'error'
-  },
-  overrides: [
-    {
-      files: ['**/*.ts', '**/*.tsx'],
-      parserOptions: {
-        project: ['tsconfig.json', 'client/tsconfig.json', 'client/tsconfig.test.json'],
-        tsconfigRootDir: __dirname
-      },
-      rules: {
-        '@typescript-eslint/member-delimiter-style': [
-          'off',
-          {
-            multiline: { delimiter: 'none', requireLast: true },
-            singleline: { delimiter: 'semi', requireLast: false }
-          }
+    env: {
+        browser: true,
+        node: true,
+    },
+    extends: ['prettier', 'prettier/@typescript-eslint'],
+    parser: '@typescript-eslint/parser',
+    parserOptions: {
+        sourceType: 'module',
+    },
+    plugins: ['@typescript-eslint'],
+    rules: {
+        'no-restricted-syntax': [
+            'warn',
+            {
+                selector: 'AwaitExpression',
+                message: 'Use Promise chains (.then/.catch) instead of async/await',
+            },
         ],
-        // Disabled due to existing violations. See issue #334
-        '@typescript-eslint/naming-convention': 'off',
-        '@typescript-eslint/no-unused-expressions': 'error',
-        '@typescript-eslint/semi': ['off', null]
-      }
-    }
-  ]
-};
+        'no-redeclare': 'error',
+    },
+    overrides: [
+        {
+            files: ['**/*.ts', '**/*.tsx'],
+            parserOptions: {
+                project: ['tsconfig.json', 'client/tsconfig.json', 'client/tsconfig.test.json'],
+                tsconfigRootDir: __dirname,
+            },
+            rules: {
+                '@typescript-eslint/member-delimiter-style': [
+                    'off',
+                    {
+                        multiline: { delimiter: 'none', requireLast: true },
+                        singleline: { delimiter: 'semi', requireLast: false },
+                    },
+                ],
+                // Disabled due to existing violations. See issue #334
+                '@typescript-eslint/naming-convention': 'off',
+                '@typescript-eslint/no-unused-expressions': 'error',
+                '@typescript-eslint/semi': ['off', null],
+            },
+        },
+    ],
+}

.github/ISSUE_TEMPLATE/bug_report.md

@@ -4,43 +4,50 @@ about: Create a report to help us improve
 title: ''
 labels: bug
 assignees: ''
-
 ---
 
 <!--
-Provide a general summary of the issue in the *Title* above 
+Provide a general summary of the issue in the *Title* above
 
-Important: Please contact the openHAB community forum for questions or 
+Important: Please contact the openHAB community forum for questions or
 for configuration and usage guidance: https://community.openhab.org/c/apps-services/vs-code
 
-Feel free to delete any comment lines in the template (starting with "<!--") 
+Feel free to delete any comment lines in the template (starting with "<!--")
 
 -->
 
 ## Expected Behavior
+
 <!-- Tell us what should happen, if the extension worked as you expected. -->
 
 ## Current Behavior
+
 <!-- Tell us what happens instead of the expected behavior.
 Include related log information (preferably debug level) and related configs.
 Use file attachment for log and config information longer than a few lines -->
 
 ## Possible Solution
+
 <!-- Not obligatory, but suggest a fix/reason for the bug, -->
 <!-- or ideas how to implement the addition or change -->
 
 ## Steps to Reproduce (for Bugs)
+
 <!-- Provide a link to a live example, or an unambiguous set of steps to -->
 <!-- reproduce this bug. Include code to reproduce, if relevant -->
+
 1.
 2.
 
 ## Context
+
 <!-- How has this issue affected you? What are you trying to accomplish? -->
 <!-- Providing context helps us come up with a solution that is most useful in the real world -->
 
 ## Your Environment
+
 <!-- Include as many relevant details about the environment you experienced the bug in -->
-* Version used: (e.g., openHAB, vscode and extension versions)
-* Environment name and version (e.g. Chrome 39, node.js 5.4, Java 8, ...):
-* Operating System and version (desktop or mobile, Windows 10, Raspbian Jessie, ...):
+
+- Version used: (e.g., openHAB, vscode and extension versions)
+- Environment name and version (e.g. Chrome 39, node.js 5.4, Java 8, ...):
+- Operating System and version (desktop or mobile, Windows 10, Raspbian Jessie, ...):

.github/ISSUE_TEMPLATE/feature_request.md

@@ -4,26 +4,29 @@ about: Suggest an idea for this project
 title: ''
 labels: enhancement
 assignees: ''
-
 ---
 
 **Is your feature request related to a problem? Please describe.**
+
 <!--
 A clear and concise description of what the problem is.
 Example: I'm always frustrated when [...]
 -->
 
 **Describe the solution you'd like**
+
 <!--
 A clear and concise description of what you want to happen.
 -->
 
 **Describe alternatives you've considered**
+
 <!--
 A clear and concise description of any alternative solutions or features you've considered.
 -->
 
 **Additional context**
+
 <!--
 Add any other context or screenshots about the feature request here.
 Maybe ther is already some discussion ongoing in the comunity forum.

.github/copilot-instructions.md

@@ -15,3 +15,15 @@ Preferred commands:
 - `gh pr list` — list PRs
 
 Never open a browser page to a GitHub issue or pull request URL to read or edit it.
+
+## Creating Cross-Fork Pull Requests
+
+This repo's branches follow the pattern `pgfeller/issue<N>` (branch name contains a slash).
+When creating a PR from fork `pgfeller/openhab-vscode` into `openhab/openhab-vscode`, use
+`owner:branch` format for `--head` — never `owner/branch`:
+
+```bash
+gh pr create --draft --repo openhab/openhab-vscode --base main --head pgfeller:pgfeller/issue334 --title "..." --body "..."
+```
+
+See the global `github-pr-cli.instructions.md` for the general rule and rationale.

.github/hooks/block-github-browser.json

@@ -1,11 +1,11 @@
 {
-  "hooks": {
-    "PreToolUse": [
-      {
-        "type": "command",
-        "command": ".github/hooks/block-github-browser.sh",
-        "timeout": 5
-      }
-    ]
-  }
-}
+    "hooks": {
+        "PreToolUse": [
+            {
+                "type": "command",
+                "command": ".github/hooks/block-github-browser.sh",
+                "timeout": 5
+            }
+        ]
+    }
+}

.github/workflows/ci.yml

@@ -1,62 +1,94 @@
 name: CI
 
 on:
-  push:
-    branches: [main]
+    push:
+        branches: [main]
 
-    paths-ignore:
-      - "docs/**"
-      - ".vscode/**"
-      - ".azure-pipelines/**"
+        paths-ignore:
+            - 'docs/**'
+            - '.vscode/**'
+            - '.azure-pipelines/**'
 
-  pull_request:
-    branches: [main]
+    pull_request:
+        branches: [main]
 
-    paths-ignore:
-      - "docs/**"
-      - ".vscode/**"
-      - ".azure-pipelines/**"
+        paths-ignore:
+            - 'docs/**'
+            - '.vscode/**'
+            - '.azure-pipelines/**'
 
 jobs:
-  build:
-    # Run the CI build for all relevant systems
-    strategy:
-      matrix:
-        os: [macos-latest, ubuntu-latest, windows-latest]
-    runs-on: ${{ matrix.os }}
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Install Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: 20.x
-
-      - run: npm install
-
-      - run: xvfb-run -a npm test
-        if: runner.os == 'Linux'
-
-      - run: npm test
-        if: runner.os != 'Linux'
-
-  package:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Install Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: 20.x
-
-      - run: npm install
-
-      - name: compile and create vsix
-        run: npm run package
-
-      - name: print vsix path
-        run: |
-          echo "VSIX Path: ${{ env.vsix_path }}"
+    build:
+        # Run the CI build for all relevant systems
+        strategy:
+            matrix:
+                os: [macos-latest, ubuntu-latest, windows-latest]
+        runs-on: ${{ matrix.os }}
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+
+            - name: Install Node.js
+              uses: actions/setup-node@v4
+              with:
+                  node-version: 20.x
+
+            - run: npm install
+
+            - run: xvfb-run -a npm test
+              if: runner.os == 'Linux'
+
+            - run: npm test
+              if: runner.os != 'Linux'
+
+    package:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+
+            - name: Install Node.js
+              uses: actions/setup-node@v4
+              with:
+                  node-version: 20.x
+
+            - run: npm install
+
+            - name: compile and create vsix
+              run: npm run package
+
+            - name: print vsix path
+              run: |
+                  echo "VSIX Path: ${{ env.vsix_path }}"
+
+    format:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+
+            - name: Install Node.js
+              uses: actions/setup-node@v4
+              with:
+                  node-version: 20.x
+
+            - run: npm install
+
+            - name: Check formatting
+              run: npm run format:check
+
+    lint:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+
+            - name: Install Node.js
+              uses: actions/setup-node@v4
+              with:
+                  node-version: 20.x
+
+            - run: npm install
+
+            - name: Run ESLint
+              run: npm run lint