Maintenance

.github/CONTRIBUTING.md

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+
+## Contributing
+
+Make sure you run `npm i` command in the project's dir before you begin, it'll install all dev dependencies. You'll also need to init git submodules:
+
+```shell
+$ npm i
+$ git submodule init
+$ git submodule update
+```
+
+Currently code coverage is **100%**, so new tests are essential when you add new functionality. There're several npm tasks
+which you can find useful:
+
+- `npm test` runs tests
+- `npm run lint` runs linter
+- `npm test --coverage` runs code coverage task and generates a report
+
+One pull request per one feature, nothing unusual.

.github/workflows/build.yml

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+name: Build
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: ["*"]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [14.x, 16.x, 18.x, 20.x]
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: recursive
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v3
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm i
+    - run: npm run lint
+    - run: npm test

.github/workflows/release.yml

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+name: Release
+on:
+  push:
+    branches:
+      - master
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Setup Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: 20
+      - name: Install dependencies
+        run: npm i
+      - name: Release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+        run: npx semantic-release

.npmrc

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+package-lock=false