Add untested automatic update script

.github/workflows/main.yml

@@ -1,6 +1,10 @@
 name: Main
 
-on: [push, pull_request]
+on:
+  push:
+    branches-ignore:
+      - 'npm-check-updates'
+  pull_request:
 
 jobs:
   test-install-and-run-from-git:

.github/workflows/update.yml

@@ -0,0 +1,143 @@
+name: Update Dependencies, Test, and Commit
+
+# Continuously update dependencies of this package and test with all versions of node on various OSes
+
+on:
+  schedule:
+    # Every Saturday at 5:00am
+    - cron: 0 5 * * 6
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    name: Update Dependencies
+    steps:
+      - name: Enable color for Npm output
+        run: echo color = always >> .npmrc
+
+      - name: Checkout latest code
+        uses: actions/checkout@v2
+        with:
+          ref: master
+          fetch-depth: 0
+
+      - name: Install Node
+        uses: actions/setup-node@v2
+
+      - name: 'Debug: Node version'
+        run: node --version
+
+        # Update all dependencies
+      - name: 'Update dependencies'
+        run: npx npm-check-updates -u --packageManager yarn
+        env:
+          FORCE_COLOR: 1
+
+        # Install dependencies and Build
+      - name: Install dependencies and Build (using `yarn install`)
+        run: yarn install
+
+      - name: 'Info: Show differences'
+        run: git diff --color=always
+
+      - name: Clean touched but identical files
+        run: 'git update-index --refresh || :'
+
+      - name: Test for changes (don't continue if there aren't any)
+        id: changes
+        run: '! git diff-index --quiet HEAD --'
+
+        # TODO: bail out "successfully" here instead of as "error"
+      - name: Switch to update branch
+        run: git checkout -b npm-check-updates
+
+      - name: Add expected file changes
+        run: git add package.json yarn.lock
+
+      - name: Set Author
+        run: |
+          git config user.email actions@github.com
+          git config user.name GitHub Actions
+
+      - name: 'Commit changes'
+        run: git commit -m 'Automatic dependency update'
+
+      - name: Test for dangling changes (error if any remain!)
+        run: git diff-index --quiet HEAD --
+
+      - name: Push to GitHub
+        run: git push origin npm-check-updates --force
+
+  test-matrix:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        node: [6, 7, 8, 9, 10, 11, 12, 13, 14, 15] # There are problems on various architectures on lower versions that are more work to fix. Please open an issue if you need more version support
+
+    runs-on: ${{ matrix.os }}
+
+    needs: update
+
+    name: Test with Node ${{ matrix.node }} on ${{ matrix.os }}
+
+    steps:
+      - name: Enable color for Npm output
+        run: echo color = always >> .npmrc
+
+      - name: Checkout latest code
+        uses: actions/checkout@v2
+        with:
+          ref: npm-check-updates
+
+      - name: Install Node ${{ matrix.node }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: 'Debug: Node version'
+        run: node --version
+
+        # Install dependencies and Build
+      - name: Install dependencies and Build (using `yarn install --frozen-lockfile`)
+        run: yarn install --frozen-lockfile
+
+      - name: 'Info: Show differences'
+        run: git diff --color=always
+
+      - name: Test Code
+        run: yarn test --ci
+
+  merge:
+    name: 'Merge updates into master'
+
+    needs: test-matrix
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Enable color for Npm output
+        run: echo color = always >> .npmrc
+
+      - name: Checkout latest code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: master
+
+      - name: Merge
+        run: git merge --ff-only origin/npm-check-updates
+
+      - name: Set Author
+        run: |
+          git config user.email actions@github.com
+          git config user.name GitHub Actions
+
+      - name: Bump Version
+        run: yarn version --patch
+
+      - name: Push
+        run: git push --tags --atomic origin master
+
+      - name: Cleanup
+        run: git branch -d origin/npm-check-updates

.github/workflows/versions.yml

@@ -2,6 +2,8 @@ name: Test All Versions
 
 on:
   push:
+    branches-ignore:
+      - 'npm-check-updates'
   pull_request:
   repository_dispatch:
   schedule: