The entire test bundle is lost if typescript is used

[NullVoxPopuli]

reproduction here: https://github.com/NullVoxPopuli/ember-cli-babel-loses-test-bundle-if-typescript/commits/main

steps:

• ember new my-app
• cd my-app
• enable typescript in ember-cli-babel
• make some TS

  mv tests/test-helper.js tests/test-helper.ts
  mv app/app.js app/app.ts
  ember g component foo
  mv tests/integration/component/foo-test.js tests/integration/component/foo-test.js.ts

• ember s

visit /tests
open console

Uncaught Error: Could not find module `typescript-test/tests/test-helper` imported from `(require)`
    at missingModule (loader.js:247)
    at findModule (loader.js:258)
    at requireModule (loader.js:24)
    at tests-suffix.js:1

[NullVoxPopuli]

omg. I need to stop for the day. ember-cli-build should be ember-cli-babel. 🤦