Update ts-jest 22.0.1 -> 23.10.3

[kdela]

Update ts-jest version from 22.0.1 to 23.10.3

#399

[r3nya]

Hey!
Thanks for your PR.

In the latest version you need to update file https://github.com/wmonk/create-react-app-typescript/blob/master/scripts/utils/createJestConfig.js#L67 to

"tsConfig": paths.appTsTestConfig

Docs: https://github.com/kulshekhar/ts-jest/blob/2852078d83cc58eed3986aa2e3e210cd5d306b23/docs/user/config/tsConfig.md#path-to-a-tsconfig-file

Please update this template as well.

[r3nya]

👍

[Arelav]

I wanted to create the same PR.
Also it requires to chage:

'^.+\\.tsx?$': resolve('config/jest/typescriptTransform.js'),

to just

 "^.+\\.tsx?$": "ts-jest",

according to this warning
ts-jest[main] (WARN) Replace any occurrences of "ts-jest/dist/preprocessor.js" or "<rootDir>/node_modules/ts-jest/preprocessor.js" in the 'transform' section of your Jest config with just "ts-jest".

[DorianGrey]

We've used the custom typescript transform file as a wrapper for ts-jest in the past because there were some issue with properly resolving the transformer in both non-ejected and ejected mode. However, CI indicates that it works fine with just using ts-jest, which should achieve the same we've used the wrapper for previously.

Just one issue left: ts-jest now complains that the jest version in use is not tested. It is still pinned to 20.0.4, and I'm not sure why - anyway, I think it'd be better to get rid of this warning. Would you mind updating jest as well (23.6 should be the most recent) and remove the pin?

[Arelav]

@DorianGrey Also we have to remove config/jest/typescriptTransform.js as well if it's not in use anymore.