Ejecting writes an absolute path Jest modulePath config

Created by: sdemjanenko

Describe the bug

When using typescript, run eject and then look at the Jest config in package.json. The modulePaths array will have an absolute path instead of being relative to the root dir (e.g. /home/stephen/my-app/src vs <rootDir>/src).

Did you try recovering your dependencies?

This is reproducible from a brand new install.

Which terms did you search for in User Guide?

There is no reference to modulePaths in the user guide.

Environment

Environment Info:

  current version of create-react-app: 3.4.1
  running from /home/stephen/.npm/_npx/1849/lib/node_modules/create-react-app

  System:
    OS: Linux 4.4 Ubuntu 18.04.3 LTS (Bionic Beaver)
    CPU: (8) x64 Intel(R) Core(TM) i7-1065G7 CPU @ 1.30GHz
  Binaries:
    Node: 12.16.1 - /usr/bin/node
    Yarn: 1.22.4 - /usr/local/bin/yarn
    npm: 6.14.4 - /usr/bin/npm
  Browsers:
    Chrome: Not Found
    Firefox: Not Found
  npmPackages:
    react: ^16.13.1 => 16.13.1
    react-dom: ^16.13.1 => 16.13.1
    react-scripts: 3.4.1 => 3.4.1
  npmGlobalPackages:
    create-react-app: Not Found

Steps to reproduce

yarn run eject
Open package.json and look for Jest's modulePaths

Expected behavior

I expected modulePaths to be ["<rootDir>/src"]

Actual behavior

modulePaths was ["/home/stephen/my-app/src"]

Reproducible demo

https://github.com/sdemjanenko/cra-typescript-eject-bug

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