src/vs/workbench/services/textmodelResolver/common/textModelResolverService.ts/TextModelResolverService/asyncModelCollection
class TextModelResolverService:	private get asyncModelCollection() {
		if (!this._asyncModelCollection) {
			this._asyncModelCollection = new AsyncReferenceCollection(this.resourceModelCollection);
		}

		return this._asyncModelCollection;
	}