Setup mocha for testing with chai and ts-node

Author: steverep

.mocharc.cjs

@@ -0,0 +1,6 @@
+module.exports = {
+  require: "ts-node/register",
+  loader: ["ts-node/esm", "./.pnp.loader.mjs"],
+  spec: ["test/**/*.spec.*"],
+  watchFiles: ["src"],
+};

.yarn/sdks/eslint/package.json

@@ -1,6 +1,6 @@
 {
   "name": "eslint",
-  "version": "8.55.0-sdk",
+  "version": "8.56.0-sdk",
   "main": "./lib/api.js",
   "type": "commonjs",
   "bin": {

eslint.config.js

@@ -8,6 +8,7 @@ import { fileURLToPath } from "url";
 
 const allFiles = "**/*.?(c|m){js,ts}";
 const jsFiles = "**/*.?(c|m)js";
+const commonFiles = "**/*.c{js,ts}";
 
 const rootDir = dirname(fileURLToPath(import.meta.url));
 const compat = new FlatCompat({ baseDirectory: rootDir });
@@ -43,4 +44,15 @@ export default [
       reportUnusedDisableDirectives: true,
     },
   },
+  {
+    files: [commonFiles],
+    languageOptions: {
+      sourceType: "commonjs",
+      globals: globals.commonjs,
+    },
+  },
+  {
+    files: ["test/**/*.spec.?(c|m)ts"],
+    languageOptions: { globals: globals.mocha },
+  },
 ];

package.json

@@ -25,7 +25,7 @@
     "type": "github",
     "url": "https://github.com/sponsors/steverep"
   },
-  "packageManager": "yarn@4.0.2",
+  "packageManager": "yarn@4.1.1",
   "engines": {
     "node": ">=16"
   },
@@ -41,6 +41,7 @@
     "format": "prettier --cache --write .",
     "lint": "yarn dedupe --check && eslint --cache . && prettier --cache --check .",
     "build": "tsc",
+    "test": "mocha",
     "clean": "rm -rf dist",
     "prepublish": "yarn run lint",
     "prepack": "yarn run build",
@@ -57,16 +58,21 @@
     "@eslint/eslintrc": "^2.1.4",
     "@eslint/js": "^8.56.0",
     "@types/babel__core": "^7.20.5",
+    "@types/chai": "^4",
     "@types/eslint-config-prettier": "^6.11.3",
     "@types/eslint__eslintrc": "^2.1.1",
     "@types/eslint__js": "^8.42.3",
-    "@types/node": "^20.10.4",
+    "@types/mocha": "^10",
+    "@types/node": "^20.11.25",
     "@typescript-eslint/eslint-plugin": "^6.14.0",
     "@typescript-eslint/parser": "^6.14.0",
+    "chai": "^4",
     "eslint": "^8.56.0",
     "eslint-config-prettier": "^9.1.0",
     "globals": "^13.24.0",
+    "mocha": "^10.3.0",
     "prettier": "^3.1.1",
+    "ts-node": "^10.9.2",
     "typescript": "^5.3.3",
     "webpack": "^5.89.0"
   }

tsconfig-lint.json

@@ -1,6 +1,6 @@
 {
   "extends": "./tsconfig.json",
-  "include": ["src/**/*", "test/**/*", "*.config.js"],
+  "include": ["src/**/*", "test/**/*", "*.config.js", ".*rc.cjs"],
   "compilerOptions": {
     "noEmit": true
   }

tsconfig.json

@@ -26,5 +26,9 @@
     "noPropertyAccessFromIndexSignature": true,
     // Completeness
     "skipLibCheck": true
+  },
+  "ts-node": {
+    "esm": true,
+    "transpileOnly": true
   }
 }