src/vs/editor/browser/services/abstractCodeEditorService.ts/AbstractCodeEditorService/getTransientModelProperty
class AbstractCodeEditorService:	public getTransientModelProperty(model: ITextModel, key: string): any {
		const uri = model.uri.toString();

		if (!this._transientWatchers.hasOwnProperty(uri)) {
			return undefined;
		}

		return this._transientWatchers[uri].get(key);
	}