Package subpath "./presets" is not defined

[Verric]

💥 Regression Report

The error

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './presets' is not defined by "exports" in /Users/rich/dev/nebula/cloud/node_modules/ts-jest/package.json
    at throwExportsNotFound (internal/modules/esm/resolve.js:285:9)
    at packageExportsResolve (internal/modules/esm/resolve.js:491:3)
    at resolveExports (internal/modules/cjs/loader.js:444:36)
    at Function.Module._findPath (internal/modules/cjs/loader.js:484:31)
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:818:27)
    at Function.Module._load (internal/modules/cjs/loader.js:687:27)
    at Module.require (internal/modules/cjs/loader.js:903:19)
    at require (internal/modules/cjs/helpers.js:74:18)
    at Object.<anonymous> (/Users/rich/dev/nebula/cloud/jest.config.js:1:31)
    at Module._compile (internal/modules/cjs/loader.js:1015:30)

when I try to run my jest tests.

Last working version

26.1.1

Stopped working in version:
27.0.0

To Reproduce

Steps to reproduce the behaviour:
setup a jest.config.js with the following

const {defaults: tsjPreset} = require(`ts-jest/presets`)

module.exports = {
  displayName: `foo`,
  testEnvironment: `node`,
  transform: tsjPreset.transform,
  collectCoverage: false,
  testPathIgnorePatterns: [`.build`, `node_modules`, `.cache`, `dist`],
}

Expected behaviour

my tests to run :p

Link to repo (highly encouraged)

Debug log:

# content of ts-jest.log :
I don't even get this far...

envinfo

System:
    OS: Mac Catalina(10.15.7)

Npm packages:
    jest: 27.0.1
    ts-jest: 27.0.0
    typescript: 4.2.4
    babel(optional): N/A

Idk random notes.

So I didn't how to describe this issue so I just filed under regression, apologies if that's wrong.

So after some scrounging around, I believe the it maybe related to PR #2477
Particularly the amendments to the package.json#exports

  -  "./presets": "./jest-preset.js",
  +  "./jest-preset": "./jest-preset.js",
  + "./preset": "./presets/index.js",

Currently in my jest.config.js I import ts-jest via

const {defaults: tsjPreset} = require(`ts-jest/presets`)

as documented at: https://kulshekhar.github.io/ts-jest/docs/getting-started/presets/#advanced

I can see that essentially ./presets has been renamed to ./jest-presets
So I changed my import statements:

- const {defaults: tsjPreset} = require(`ts-jest/presets`)
+ const tsjPreset = require(`ts-jest/jest-preset`)

And it all works, so Idk if this was intended, if this is a breaking change, if the docs need to be changed or if I completely misunderstood something and got it working in some un-intended manner.

Apologies for the long winded post

[ahnpnl]

duplicate #2623

[Verric]

Man that was quick 👀
Apologies for the dupe post