Could not find module when running host application in ember engines setup

[allenz-crypto]

Having installed ember-cli-typescript in both app and engine, and running the app, it cannot find the ts module defined in the engine.

It works when running from the engine dummy app.

Steps to reproduce: https://github.com/allenylzhou/yarn-workspaces-ember-engine

yarn version 1.6 / node version 8.11.1
OR
yarn version 1.7 / node version 8.12.0

loader.js:247 Uncaught Error: Could not find module `my-new-engine/utils/random` imported from `my-new-engine/components/some-input`
    at missingModule (loader.js:247)
    at findModule (loader.js:258)
    at Module.findDeps (loader.js:168)
    at findModule (loader.js:262)
    at requireModule (loader.js:24)
    at Class._extractDefaultExport (index.js:422)
    at Class.resolveOther (index.js:101)
    at Class.resolve (index.js:163)
    at _resolve (container.js:820)
    at Registry.resolve (container.js:570)

[mike-north]

assigning this to @dfreeman since he's been most involved with recent monorepo/workspaces efforts

[dfreeman]

Hi @allenylzhou — I see a couple of things in that project that will prevent it from working with ember-cli-typescript as it stands today.

The first is that we don't support lazy engines—ember-engines and ember-cli-typescript both break out of a number of the normal flows for the Ember CLI build process, and in this instance not in compatible ways. The second is that we have a known incompatibility in our out-of-the-box setup with yarn workspaces (see #234). To my knowledge no one has had the chance yet to dig in and understand where the root cause of that issue lies.

We're hoping to revamp the whole build system in this addon in the near future (#287 has another example of why and a bit of information on what we're thinking of), which should solve both problems.

[chriskrycho]

@dfreeman circling back on this now that we've landed all the expected build changes—would you expect this all to work now, as I would?

@allenylzhou can you try this by installing ember-cli-typescript@next?

[dfreeman]

Yes, I think I'd expect things to work as they would in pretty much any vanilla TS project at this point.