Add initial implementation (#1)

.eslintignore

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+dist/
+lib/
+node_modules/

.eslintrc.js

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+module.exports = {
+  "env": {
+      "browser": true,
+      "es2021": true
+  },
+  "extends": [
+      "eslint:recommended",
+      "plugin:@typescript-eslint/recommended"
+  ],
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+      "ecmaVersion": 12,
+      "sourceType": "module"
+  },
+  "plugins": [
+      "@typescript-eslint"
+  ],
+  "rules": {
+  }
+};

.github/dependabot.yml

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+# https://docs.github.com/en/free-pro-team@latest/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: "/"
+    schedule:
+      interval: weekly
+      time: "09:00"
+    open-pull-requests-limit: 5
+    labels:
+      - dependencies
+      - dependencies/dependabot
+      - dependencies/npm

.github/workflows/check-release.yml

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+name: Check Release
+
+on:
+  pull_request_target:
+    types: [labeled]
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions-ecosystem/action-release-label@v1
+        id: release-label
+        if: ${{ startsWith(github.event.label.name, 'release/') }}
+
+      - uses: actions-ecosystem/action-get-latest-tag@v1
+        id: get-latest-tag
+        if: ${{ steps.release-label.outputs.level != null }}
+        with:
+          semver_only: true
+
+      - uses: actions-ecosystem/action-bump-semver@v1
+        id: bump-semver
+        if: ${{ steps.release-label.outputs.level != null }}
+        with:
+          current_version: ${{ steps.get-latest-tag.outputs.tag }}
+          level: ${{ steps.release-label.outputs.level }}
+
+      - uses: actions-ecosystem/action-create-comment@v1
+        if: ${{ steps.bump-semver.outputs.new_version != null }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          body: |
+            This PR will update [${{ github.repository }}](https://github.com/${{ github.repository }}) from [${{ steps.get-latest-tag.outputs.tag }}](https://github.com/${{ github.repository }}/releases/tag/${{ steps.get-latest-tag.outputs.tag }}) to ${{ steps.bump-semver.outputs.new_version }} :rocket:
+
+            If this update isn't as you expected, you may want to change or remove the *release label*.

.github/workflows/release.yml

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+name: Create Release
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions-ecosystem/action-get-merged-pull-request@v1
+        id: get-merged-pull-request
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: actions-ecosystem/action-release-label@v1
+        id: release-label
+        if: ${{ steps.get-merged-pull-request.outputs.title != null }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: ${{ steps.get-merged-pull-request.outputs.labels }}
+
+      - uses: actions-ecosystem/action-get-latest-tag@v1
+        id: get-latest-tag
+        if: ${{ steps.release-label.outputs.level != null }}
+        with:
+          semver_only: true
+
+      - uses: actions-ecosystem/action-bump-semver@v1
+        id: bump-semver
+        if: ${{ steps.release-label.outputs.level != null }}
+        with:
+          current_version: ${{ steps.get-latest-tag.outputs.tag }}
+          level: ${{ steps.release-label.outputs.level }}
+
+      - uses: actions-ecosystem/action-regex-match@v2
+        id: regex-match
+        if: ${{ steps.bump-semver.outputs.new_version != null }}
+        with:
+          text: ${{ steps.get-merged-pull-request.outputs.body }}
+          regex: '```release_note([\s\S]*)```'
+
+      - uses: actions-ecosystem/action-push-tag@v1
+        if: ${{ steps.bump-semver.outputs.new_version != null }}
+        with:
+          tag: ${{ steps.bump-semver.outputs.new_version }}
+          message: "${{ steps.bump-semver.outputs.new_version }}: PR #${{ steps.get-merged-pull-request.outputs.number }} ${{ steps.get-merged-pull-request.outputs.title }}"
+
+      - uses: actions/create-release@v1
+        if: ${{ steps.release-label.outputs.level == 'major' || steps.release-label.outputs.level == 'minor' }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ steps.bump-semver.outputs.new_version }}
+          release_name: ${{ steps.bump-semver.outputs.new_version }}
+          body: ${{ steps.regex-match.outputs.group1 }}
+
+      - uses: actions-ecosystem/action-create-comment@v1
+        if: ${{ steps.bump-semver.outputs.new_version != null }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          number: ${{ steps.get-merged-pull-request.outputs.number }}
+          body: |
+            The new version [${{ steps.bump-semver.outputs.new_version }}](https://github.com/${{ github.repository }}/releases/tag/${{ steps.bump-semver.outputs.new_version }}) has been released :tada:

.github/workflows/size.yml

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+name: Size
+
+on:
+  pull_request_target:
+    types: [opened, reopened, synchronize]
+
+jobs:
+  update_labels:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions-ecosystem/action-size@v2
+        id: size
+
+      - uses: actions-ecosystem/action-remove-labels@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: ${{ steps.size.outputs.stale_labels }}
+
+      - uses: actions-ecosystem/action-add-labels@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: ${{ steps.size.outputs.new_label }}

.github/workflows/test.yml

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+name: Test
+
+on: push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-node@v2-beta
+        with:
+          node-version: "12.x"
+
+      - run: yarn install
+
+      - run: yarn test
+
+      - run: yarn lint

.gitignore

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+node_modules/
+lib/
+__tests__/runner/*

.prettierrc.json

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+{
+  "printWidth": 80,
+  "tabWidth": 2,
+  "useTabs": false,
+  "semi": true,
+  "singleQuote": true,
+  "trailingComma": "none",
+  "bracketSpacing": true,
+  "arrowParens": "avoid",
+  "parser": "typescript"
+}