Implement linting

.eslintignore

@@ -4,4 +4,5 @@ node_modules
 dist
 out
 # don't lint nyc coverage output
-coverage
+coverage
+.eslintrc.js

.eslintrc.js

@@ -1,26 +1,44 @@
 module.exports = {
   root: true,
   env: {
-    browser: true,
+    node: true,
     es2021: true,
   },
   extends: [
-    "airbnb-typescript",
+    "airbnb-typescript/base",
     "eslint:recommended",
+    "plugin:@typescript-eslint/eslint-recommended",
     "plugin:@typescript-eslint/recommended",
+    "plugin:@typescript-eslint/recommended-requiring-type-checking",
+    "plugin:import/errors",
+    "plugin:import/typescript",
     "prettier",
     "prettier/@typescript-eslint",
   ],
   parser: "@typescript-eslint/parser",
   parserOptions: {
-    ecmaVersion: 2021,
-    sourceType: "module",
-    impliedStrict: true,
     project: "./tsconfig.json",
+    tsconfigRootDir: __dirname,
   },
   plugins: ["@typescript-eslint", "import"],
   rules: {
+    "no-void": "off",
     "no-console": "off",
+    "import/no-extraneous-dependencies": [
+      "error",
+      {
+        devDependencies: ["src/test/**/*.ts"],
+      },
+    ],
+    "@typescript-eslint/restrict-template-expressions": [
+      "error",
+      {
+        allowAny: true,
+        allowNumber: true,
+        allowBoolean: true,
+        allowNullish: false,
+      },
+    ],
     "@typescript-eslint/no-use-before-define": [
       "error",
       { functions: false, classes: false },
@@ -37,16 +55,9 @@ module.exports = {
     ],
   },
   settings: {
-    node: {
-      tryExtensions: [".js", ".json", ".node", ".ts", ".d.ts"],
-    },
-    "import/parsers": {
-      "@typescript-eslint/parser": [".ts"],
-    },
     "import/resolver": {
       typescript: {
-        alwaysTryTypes: true, // always try to resolve types under `<root>@types` directory even it doesn't contain any source code, like `@types/unist`
-        project: "tsconfig.json",
+        alwaysTryTypes: true,
       },
     },
   },

.github/workflows/continues_integration.yml

@@ -18,5 +18,7 @@ jobs:
             node-version: ${{ matrix.node-version }}
         - name: Install
           run: npm ci
+        - name: Lint
+          run: npm run lint
         - name: Package
           run: npm run vsce:package