Initial implementation of shared Prettier config

Signed-off-by: Miroslav Bajtoš <oss@bajtos.net>

Author: bajtos

.github/CODEOWNERS

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+* @bajtos @juliangruber @pyropy @NikolasHaimerl
+package.json
+package-lock.json

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: 'npm'
+    directory: '/'
+    schedule:
+      interval: 'daily'
+      time: '09:00'
+      timezone: 'Europe/Berlin'
+    commit-message:
+      prefix: 'deps'
+      prefix-development: 'deps(dev)'

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+      - run: npm ci
+      - run: npm run lint

.github/workflows/dependabot-auto-approve-minor.yml

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+name: Dependabot auto-approve minor updates
+on: pull_request
+
+permissions:
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    strategy:
+      matrix:
+        dependencyStartsWith:
+          - prettier
+          - neostandard
+          - eslint
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v2
+        with:
+          github-token: '${{ secrets.GITHUB_TOKEN }}'
+      - name: Approve a PR
+        if: ${{startsWith(steps.metadata.outputs.dependency-names, matrix.dependencyStartsWith) && (steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor')}}
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

.github/workflows/dependabot-auto-merge.yml

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+name: Dependabot auto-merge
+on: pull_request
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+      - name: Enable auto-merge for Dependabot PRs
+        run: gh pr merge --auto --squash "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

README.md

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 # prettier-config
+
 Shared configuration for Prettier
+
+## Usage
+
+Add this package as a dev-dependency to your project and tell prettier to use it as the configuration:
+
+```json
+{
+  "prettier": "@CheckerNetwork/prettier-config"
+  "devDependencies": {
+    "@CheckerNetwork/prettier-config": "^1.0.0",
+    "prettier": "^3.5.3"
+  }
+}
+```
+
+## Development
+
+Publish a new version:
+
+```bash
+$ npx np
+```

eslint.config.js

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+import neostandard from 'neostandard'
+
+export default neostandard({
+  noStyle: true, // Disable style-related rules, we use Prettier
+  ts: true,
+})

index.js

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+/**
+ * @typedef {import('prettier').Config} Config
+ * @see https://prettier.io/docs/configuration
+ */
+
+/** @type {Config} */
+export default {
+  plugins: [
+    // Order of plugins is important!
+    // See https://github.com/electrovir/prettier-plugin-multiline-arrays?tab=readme-ov-file#compatibility
+    'prettier-plugin-packagejson',
+    'prettier-plugin-jsdoc',
+  ],
+
+  // built-in options
+  semi: false,
+  singleQuote: true,
+
+  // prettier-plugin-jsdoc
+  tsdoc: true,
+}