src/vs/editor/common/tokenizationRegistry.ts/TokenizationRegistry/isResolved
class TokenizationRegistry:	public isResolved(languageId: string): boolean {
		const tokenizationSupport = this.get(languageId);
		if (tokenizationSupport) {
			return true;
		}

		const factory = this._factories.get(languageId);
		if (!factory || factory.isResolved) {
			return true;
		}

		return false;
	}