score:2
In CRA 2.1 and later versions, you should be able to use TypeScript for your test files without any special jest config at all. Just be sure that your __tests__ folder is nested underneath your src folder, or that your test files are inside your src folder and have any of the following extensions:
.test.js.test.ts.test.jsx.test.tsx.spec.js.spec.ts.spec.jsx.spec.tsx
Source: stackoverflow.com
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