src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts/MainThreadLanguageFeatures/$emitDocumentSemanticTokensEvent
class MainThreadLanguageFeatures:	$emitDocumentSemanticTokensEvent(eventHandle: number): void {
		const obj = this._registrations.get(eventHandle);
		if (obj instanceof Emitter) {
			obj.fire(undefined);
		}
	}