Add CI workflow to lint TypeScript and JavaScript code

On every push and pull request that affects relevant files, and periodically, run eslint on the repository's TypeScript
and JavaScript files.

eslint is configured via the .eslintrc.yml file:
https://eslint.org/docs/user-guide/configuring/configuration-files

Author: MatteoPologruto

.eslintrc.yml

@@ -0,0 +1,24 @@
+# Source: https://github.com/per1234/.github/blob/main/workflow-templates/assets/check-typescript/.eslintrc.yml
+# See: https://github.com/typescript-eslint/typescript-eslint/blob/main/docs/linting/README.md#configuration
+# The code style defined in this file is the official standardized style to be used in all Arduino projects and should
+# not be modified.
+
+extends:
+  - airbnb-typescript/base
+  - prettier
+  - 'eslint:recommended'
+  - 'plugin:@typescript-eslint/recommended'
+  - 'plugin:import/recommended'
+plugins:
+  - "@typescript-eslint"
+parser: "@typescript-eslint/parser"
+parserOptions:
+  project:
+    - "./tsconfig.eslint.json"
+rules:
+  max-len:
+    - error
+    - code: 180
+  no-console: "off"
+  no-underscore-dangle: "off"
+root: true

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

@@ -0,0 +1,58 @@
+# Source: https://github.com/per1234/.github/blob/main/workflow-templates/check-typescript-task.md
+name: Check TypeScript
+
+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-typescript-task.ya?ml"
+      - ".eslintignore"
+      - "**/.eslintrc*"
+      - "package.json"
+      - "package-lock.json"
+      - "Taskfile.ya?ml"
+      - "tsconfig.eslint.json"
+      - "tsconfig.json"
+      - "**.[jt]sx?"
+  pull_request:
+    paths:
+      - ".github/workflows/check-typescript-task.ya?ml"
+      - ".eslintignore"
+      - "**/.eslintrc*"
+      - "package.json"
+      - "package-lock.json"
+      - "Taskfile.ya?ml"
+      - "tsconfig.eslint.json"
+      - "tsconfig.json"
+      - "**.[jt]sx?"
+  workflow_dispatch:
+  repository_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+
+    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: Lint
+        run: task ts:lint

README.md

@@ -8,6 +8,7 @@
 [![Check Taskfiles status](https://github.com/arduino/setup-protoc/actions/workflows/check-taskfiles.yml/badge.svg)](https://github.com/arduino/setup-protoc/actions/workflows/check-taskfiles.yml)
 [![Integration Tests status](https://github.com/arduino/setup-protoc/actions/workflows/test-integration.yml/badge.svg)](https://github.com/arduino/setup-protoc/actions/workflows/test-integration.yml)
 [![Check npm status](https://github.com/arduino/setup-protoc/actions/workflows/check-npm-task.yml/badge.svg)](https://github.com/arduino/setup-protoc/actions/workflows/check-npm-task.yml)
+[![Check TypeScript status](https://github.com/arduino/setup-protoc/actions/workflows/check-typescript-task.yml/badge.svg)](https://github.com/arduino/setup-protoc/actions/workflows/check-typescript-task.yml)
 
 This action makes the `protoc` compiler available to Workflows.
 

Taskfile.yml

@@ -219,3 +219,16 @@ tasks:
         else
           echo "{{.RAW_PATH}}"
         fi
+  ts:lint:
+    desc: Lint TypeScript code
+    deps:
+      - task: npm:install-deps
+    cmds:
+      - npx eslint --ext .js,.jsx,.ts,.tsx .
+
+  ts:fix-lint:
+    desc: Fix TypeScript code linting violations
+    deps:
+      - task: npm:install-deps
+    cmds:
+      - npx eslint --ext .js,.jsx,.ts,.tsx --fix .