Potential issue with mismatched @ember/test-waiters in dep graph

[thoov]

There seems to be an issue when yarn why @ember/test-waiters has multiple versions. highlander code might be a place to investigate.

Reproductions steps:

1. ember new foobar --yarn
2. yarn add --dev @embroider/core @embroider/compat @embroider/webpack webpack
3. ember install @ember/test-waiters@2.4.5

Finally add to ember-cli-build.js:

const { Webpack } = require('@embroider/webpack');
return require('@embroider/compat').compatBuild(app, Webpack);

Result

Then run ember b and you will encounter the following error:

Build Error (WaitForTrees)

ENOENT: no such file or directory, open '/private/var/folders/61/n399scw50nq264twrz32ccgr000vkn/T/embroider/b8ef3e/node_modules/@ember/test-helpers/node_modules/@ember/test-waiters/package.json'


Stack Trace and Error Report: /var/folders/61/n399scw50nq264twrz32ccgr000vkn/T/error.dump.5c2dc6c6019426ac6515ab214b869a0d.log

[thoov]

cc: @ef4

[angelayanpan]

maybe related to this: #778 (comment) ??