Migrate Jest to vitest

.github/workflows/test.yml

@@ -19,23 +19,19 @@ jobs:
         with:
           node-version: ${{ matrix.version }}
       - run: npm ci
-      - run: npm test --coverage
+      - run: npm run test:coverage
       - run: npm run build
       - run: npm run build:docs
       - run: npm link
       - run: npm ci
         working-directory: e2e/js
       - run: npm link '@maxmind/minfraud-api-node'
         working-directory: e2e/js
-      - run: npx jest
+      - run: npx vitest run
         working-directory: e2e/js
-        env:
-          NODE_OPTIONS: --experimental-vm-modules
       - run: npm ci
         working-directory: e2e/ts
       - run: npm link '@maxmind/minfraud-api-node'
         working-directory: e2e/ts
-      - run: npx jest
+      - run: npx vitest run
         working-directory: e2e/ts
-        env:
-          NODE_OPTIONS: --experimental-vm-modules

CLAUDE.md

@@ -16,7 +16,7 @@ The library is server-side only and provides strongly-typed request/response mod
 - TypeScript with strict type checking
 - Node.js 22+ (targets active LTS versions)
 - Uses Node.js built-in `fetch` for HTTP requests
-- Jest for testing
+- Vitest for testing
 - ESLint + Prettier for code quality
 - TypeDoc for API documentation
 - Depends on @maxmind/geoip2-node for IP geolocation data
@@ -153,8 +153,11 @@ npm test
 # Run tests in watch mode
 npm run test:watch
 
+# Run tests with coverage (100% thresholds enforced)
+npm run test:coverage
+
 # Run specific test file
-npx jest src/webServiceClient.spec.ts
+npx vitest run src/webServiceClient.spec.ts
 ```
 
 ### Linting and Building

e2e/js/index.spec.js

@@ -1,3 +1,4 @@
+import { describe, expect, it } from 'vitest';
 import * as minFraud from '@maxmind/minfraud-api-node';
 
 describe('client', () => {