typescript-eslint · JoshuaKGoldberg · Apr 14, 2025 · Feb 3, 2025 · Feb 3, 2025 · Feb 3, 2025
diff --git a/eslint.config.mjs b/eslint.config.mjs
@@ -36,6 +36,7 @@ const vitestFiles = [
   'packages/integration-tests/tools/pack-packages.ts',
   'packages/parser/tests/lib/**/*.test.{ts,tsx,cts,mts}',
   'packages/parser/tests/test-utils/**/*.{ts,tsx,cts,mts}',
+  'packages/rule-tester/tests/**/*.test.{ts,tsx,cts,mts}',
   'packages/type-utils/tests/**/*.test.{ts,tsx,cts,mts}',
   'packages/typescript-eslint/tests/**/*.test.{ts,tsx,cts,mts}',
   'packages/utils/tests/**/*.test?(-d).{ts,tsx,cts,mts}',

diff --git a/knip.ts b/knip.ts
@@ -71,6 +71,10 @@ export default {
     },
     'packages/rule-tester': {
       ignore: ['typings/eslint.d.ts'],
+
+      mocha: {
+        entry: ['tests/eslint-base/eslint-base.test.js'],
+      },
     },
     'packages/scope-manager': {
       ignore: ['tests/fixtures/**'],

diff --git a/packages/rule-tester/jest.config.js b/packages/rule-tester/jest.config.js
diff --git a/packages/rule-tester/package.json b/packages/rule-tester/package.json
@@ -42,7 +42,7 @@
     "lint": "npx nx lint",
     "pretest-eslint-base": "tsc -b tsconfig.build.json",
     "test-eslint-base": "mocha --require source-map-support/register ./tests/eslint-base/eslint-base.test.js",
-    "test": "npx jest",
+    "test": "vitest --run --config=$INIT_CWD/vitest.config.mts",
     "check-types": "npx nx typecheck"
   },
   "//": "NOTE - AJV is out-of-date, but it's intentionally synced with ESLint - https://github.com/eslint/eslint/blob/ad9dd6a933fd098a0d99c6a9aa059850535c23ee/package.json#L70",
@@ -59,17 +59,18 @@
     "eslint": "^8.57.0 || ^9.0.0"
   },
   "devDependencies": {
-    "@jest/types": "29.6.3",
     "@types/json-stable-stringify-without-jsonify": "^1.0.2",
     "@types/lodash.merge": "4.6.9",
+    "@vitest/coverage-v8": "^3.1.1",
     "chai": "^4.4.1",
     "eslint-visitor-keys": "^4.2.0",
     "espree": "^10.3.0",
     "esprima": "^4.0.1",
     "mocha": "^10.4.0",
     "sinon": "^16.1.3",
     "source-map-support": "^0.5.21",
-    "typescript": "*"
+    "typescript": "*",
+    "vitest": "^3.1.1"
   },
   "funding": {
     "type": "opencollective",

diff --git a/packages/rule-tester/project.json b/packages/rule-tester/project.json
@@ -1,12 +1,16 @@
 {
   "name": "rule-tester",
   "$schema": "../../node_modules/nx/schemas/project-schema.json",
-  "type": "library",
-  "implicitDependencies": [],
+  "projectType": "library",
+  "root": "packages/rule-tester",
+  "sourceRoot": "packages/rule-tester/src",
   "targets": {
     "lint": {
       "executor": "@nx/eslint:lint",
       "outputs": ["{options.outputFile}"]
+    },
+    "test": {
+      "executor": "@nx/vite:test"
     }
   }
 }