Are @types/ember__test-helpers still necessary?

[nicolechung]

Asking because I'm getting this error:

TS2688: Cannot find type definition file for 'ember__test-helpers'.
       [js]   The file is in the program because:
       [js]     Entry point for implicit type library 'ember__test-helpers'

Does this mean this line can be removed?

ember-addon-migrator/tests/fixtures/base-ts-v1-addon/package.json

Line 64 in 1cca35e

"@types/ember__test-helpers": "^2.6.1",

[NullVoxPopuli]

They are not! -- nice find!

@types/ember__test-helpers breaks type checking 🙈 --- ember-cli-typescript hasn't had a release since October.
So, anyone working with TS will want these changes in their blueprint / updates / migrations as well: https://github.com/typed-ember/ember-cli-typescript/pulls/@me

I think @simonihmig is working on updating the TS blueprint in ember-cli -- which will greatly help mitigate all the TS work-arounds everywhere -- in this repo, in the v2 addon blueprint, etc