This is a far-from-complete initial pass at adding ambient type information for ember-data.

Currently, in order to resolve model names to types in places like...

class AllPostsRoute extends Route {
  
  model(): Promise<ArrayProxy<BlogPost>> {
    return this.store.findAll('blog-post');
  }

}

class BlogPost extends DS.Model {
 
 author: ComputedProperty<User> = hasMany('user')

}

Users have to create a little RecordTypeMap mapping in their project (see below). Additional transforms for attr types can be specified here as well via a TransformsMap mapping, and the ambient types in this branch will take them into account when validating constraints.

app/ember-data.custom.d.ts

declare module 'ember-data/types' {
  import { BlogPost } from 'my-app/models/blog-post';
  import { User } from 'mikenorth/models/user';

  interface RecordTypeMap {
    user: User;
    'blog-post': BlogPost;
  }
  interface TransformsMap {
    csv: string[];
  }
}

I'll periodically update this as I flesh things out. If users wish to try these in their project right now, just create a file called app/ember-data.d.ts identical to the index.d.ts from this branch.