isolatedModules error on Jest test with Create React App and TypeScript?
问题 I've started a Create React App project with --typescript. When I write a test Im getting a compiler error: // something-test.tsx test('something', ()=>{ expect(1).toBe(1) }) The error is: TS1208: All files must be modules when the '--isolatedModules' flag is provided. From googling I thought the fix was to create a jest.config.tsx with: module.exports = { roots: ["<rootDir>/src"], transform: { "^.+\\.tsx?$": "ts-jest" }, testRegex: "(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$",