Use ts-jest so that test files can be run without transpiling

[trivikr]

Is your feature request related to a problem? Please describe.
The test files *.spec.ts are currently transpiled to JavaScript before being run

Describe the solution you'd like
Use ts-jest so that *.spec.ts files can be run without transpiling

Describe alternatives you've considered
Continue transpiling files before running tests

[trivikr]

compilerOptions.paths needs to be set up in order to use ts-jest:

• Documentation: https://kulshekhar.github.io/ts-jest/user/config/#paths-mapping
• Related: Use compilerOptions.paths to resolve @aws-sdk/ dependencies #1026

https://jestjs.io/blog/2019/01/25/jest-24-refreshing-polished-typescript-friendly
jest v24+ already has native support for typescript.

[trivikr]

One caveat to the default TypeScript support, similar to Flow, is that Babel will only strip out the type annotations to make your code valid JavaScript. It will not typecheck your code.
If you want to run typechecks while you test, you should use ts-jest

The native support for TypeScript in Jest 24+ won't typecheck the code.

[github-actions]

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