Jest 27.0.0-next.5 support

[ai]

🐛 Bug Report

Using ts-jest 27.0.0-next.8 with jest 27.0.0-next.5 leads to error:

TypeError: Jest: a transform must export something.
    at /home/ai/Dev/akeero-front/node_modules/@jest/transform/build/ScriptTransformer.js:414:19
    at Array.map (<anonymous>)
    at ScriptTransformer.loadTransformers (/home/ai/Dev/akeero-front/node_modules/@jest/transform/build/ScriptTransformer.js:387:30)
    at createScriptTransformer (/home/ai/Dev/akeero-front/node_modules/@jest/transform/build/ScriptTransformer.js:1121:21)
    at /home/ai/Dev/akeero-front/node_modules/@jest/core/build/TestScheduler.js:273:78
    at Array.map (<anonymous>)
    at TestScheduler.scheduleTests (/home/ai/Dev/akeero-front/node_modules/@jest/core/build/TestScheduler.js:267:28)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
    at async runJest (/home/ai/Dev/akeero-front/node_modules/@jest/core/build/runJest.js:377:19)
    at async _run10000 (/home/ai/Dev/akeero-front/node_modules/@jest/core/build/cli/index.js:406:7)

To Reproduce

Steps to reproduce the behavior:

// jest.config.json
{
  "preset": "ts-jest/presets/default-esm",
  "globals": {
    "ts-jest": {
      "useESM": true
    }
  },
  "testEnvironment": "node"
}

yarn add jest@next
yarn add ts-jest@next
echo "it.todo('test')" > index.test.ts
NODE_OPTIONS=--experimental-vm-modules npx jest

Debug log:

# content of ts-jest.log :
{"context":{"allowJs":false,"logLevel":20,"namespace":"jest-preset","package":"ts-jest","version":"27.0.0-next.8"},"message":"creating jest presets not handling JavaScript files","sequence":1,"time":"2021-03-17T00:37:15.657Z"}
{"context":{"allowJs":false,"logLevel":20,"namespace":"jest-preset","package":"ts-jest","version":"27.0.0-next.8"},"message":"creating jest presets not handling JavaScript files","sequence":2,"time":"2021-03-17T00:37:15.662Z"}
{"context":{"logLevel":20,"namespace":"Importer","package":"ts-jest","version":"27.0.0-next.8"},"message":"creating Importer singleton","sequence":3,"time":"2021-03-17T00:37:15.933Z"}

envinfo

System:
    OS: Linux
    Node version: 15.11.0

Npm packages:
    jest: 27.0.0-next.5
    ts-jest: 27.0.0-next.8

[ai]

Can you release the fix, please?

[ahnpnl]

27.0.0-next.9 was out.