Add CI workflow to validate tsconfig files

On every push or pull request that affects the repository's tsconfig files, and periodically, validate them
against the JSON schema.

Author: MatteoPologruto

.github/workflows/check-tsconfig-task.yml

@@ -0,0 +1,54 @@
+name: Check TypeScript Configuration
+
+env:
+  # See: https://github.com/actions/setup-node/#readme
+  NODE_VERSION: 16.x
+
+# See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows
+on:
+  push:
+    paths:
+      - ".github/workflows/check-tsconfig-task.ya?ml"
+      - "**/tsconfig*.json"
+      - "Taskfile.ya?ml"
+  pull_request:
+    paths:
+      - ".github/workflows/check-tsconfig-task.ya?ml"
+      - "**/tsconfig*.json"
+      - "Taskfile.ya?ml"
+  schedule:
+    # Run every Tuesday at 8 AM UTC to catch breakage from changes to the JSON schema.
+    - cron: "0 8 * * TUE"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+
+      matrix:
+        file:
+          - ./tsconfig.json
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          version: 3.x
+
+      - name: Validate ${{ matrix.file }}
+        env:
+          TSCONFIG_PATH: ${{ matrix.file }}
+        run: task --silent ts:validate

Taskfile.yml

@@ -1,6 +1,10 @@
 # See: https://taskfile.dev/#/usage
 version: "3"
 
+vars:
+  # Last version of ajv-cli with support for the JSON schema "Draft 4" specification
+  SCHEMA_DRAFT_4_AJV_CLI_VERSION: 3.3.0
+
 tasks:
   # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-dependencies-task/Taskfile.yml
   general:cache-dep-licenses:
@@ -116,3 +120,70 @@ tasks:
       - task: npm:install-deps
     cmds:
       - npx markdownlint-cli "**/*.md"
+
+  ts:validate:
+    desc: Validate TypeScript configuration file against its JSON schema
+    vars:
+      # Source: https://github.com/SchemaStore/schemastore/blob/master/src/schemas/json/tsconfig.json
+      SCHEMA_URL: https://json.schemastore.org/tsconfig.json
+      SCHEMA_PATH:
+        sh: task utility:mktemp-file TEMPLATE="tsconfig-schema-XXXXXXXXXX.json"
+      INSTANCE_PATH: '{{default "./tsconfig.json" .TSCONFIG_PATH}}'
+      WORKING_FOLDER:
+        sh: task utility:mktemp-folder TEMPLATE="ts-validate-XXXXXXXXXX"
+      WORKING_INSTANCE_PATH:
+        sh: echo "{{.WORKING_FOLDER}}/$(basename "{{.INSTANCE_PATH}}")"
+    cmds:
+      - |
+        # TypeScript allows comments in tsconfig.json.
+        # ajv-cli did not support comments in JSON at the 3.x version in use (support was added in a later version).
+        npx strip-json-comments-cli \
+          --no-whitespace \
+          "{{.INSTANCE_PATH}}" \
+          > "{{.WORKING_INSTANCE_PATH}}"
+      - |
+        wget \
+          --quiet \
+          --output-document="{{.SCHEMA_PATH}}" \
+          {{.SCHEMA_URL}}
+      - |
+        cd "{{.WORKING_FOLDER}}"  # Workaround for https://github.com/npm/cli/issues/3210
+        npx ajv-cli@{{.SCHEMA_DRAFT_4_AJV_CLI_VERSION}} validate \
+          --all-errors \
+          -s "{{.SCHEMA_PATH}}" \
+          -d "{{.WORKING_INSTANCE_PATH}}"
+
+  # Make a temporary file named according to the passed TEMPLATE variable and print the path passed to stdout
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/windows-task/Taskfile.yml
+  utility:mktemp-file:
+    vars:
+      RAW_PATH:
+        sh: mktemp --tmpdir "{{.TEMPLATE}}"
+    cmds:
+      - task: utility:normalize-path
+        vars:
+          RAW_PATH: "{{.RAW_PATH}}"
+
+  # Make a temporary folder named according to the passed TEMPLATE variable and print the path passed to stdout
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/windows-task/Taskfile.yml
+  utility:mktemp-folder:
+    vars:
+      RAW_PATH:
+        sh: mktemp --directory --tmpdir "{{.TEMPLATE}}"
+    cmds:
+      - task: utility:normalize-path
+        vars:
+          RAW_PATH: "{{.RAW_PATH}}"
+
+  # Print a normalized version of the path passed via the RAW_PATH variable to stdout
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/windows-task/Taskfile.yml
+  utility:normalize-path:
+    cmds:
+      - |
+        if [[ "{{.OS}}" == "Windows_NT" ]] && which cygpath &>/dev/null; then
+            # Even though the shell handles POSIX format absolute paths as expected, external applications do not.
+            # So paths passed to such applications must first be converted to Windows format.
+            cygpath -w "{{.RAW_PATH}}"
+        else
+          echo "{{.RAW_PATH}}"
+        fi