TypeScript Circular reference error

[hlz]

Describe the bug
Circular reference errors are thrown from TypeScript when using the Product entity in a local service class.

To Reproduce
Steps to reproduce the behavior:

1. Create a clean install of Vendure
2. Create a file with this code:

import {
	Injectable
} from '@nestjs/common';
import {
	CreateProductInput,
} from '@vendure/common/lib/generated-types';
import { ID } from '@vendure/common/lib/shared-types';
import {
	Product,
	ProductTranslation,
	RequestContext,
} from '@vendure/core';

import { TranslatableSaver } from '@vendure/core/dist/service/helpers/translatable-saver/translatable-saver';

@Injectable()
export class TestImporterService {
	constructor(
		private translatableSaver: TranslatableSaver,
	) {
	}
	
	async createProduct(input: CreateProductInput): Promise<ID> {
		const product = await this.translatableSaver.create({
			ctx: RequestContext.empty(),
			input,
			entityType: Product,
			translationType: ProductTranslation,
			beforeSave: async () => {
				//
			},
		});
		
		return product.id;
	}
}

3. See typescript errors appear

Expected behavior
I do not expect these errors to happen.

Environment (please complete the following information):

• @vendure/core version: 1.0.0-beta.4
• Nodejs version v14.15.2
• Database (mysql/postgres etc): postgres

Additional context
See Slack's help channel for a discussion about this issue.

[hlz]

Fwiw, the issue also happens in the Facet entity. In fact every entity that uses the Translation<T> type to reference itself has the issue. Think it all boils down to this line: https://github.com/vendure-ecommerce/vendure/blob/master/packages/core/src/common/types/locale-types.ts#L39

When I remove the TranslatableKeys part from my local dist version everything works.