How to use the @theia/filesystem/lib/common/filesystem-watcher-protocol.FileChangeType.UPDATED function in @theia/filesystem

protected updateModels = debounce(async () => {
        const roots = await this.workspaceService.roots;
        const toDelete = new Set(this.models.keys());
        for (const rootStat of roots) {
            const key = rootStat.uri;
            toDelete.delete(key);
            if (!this.models.has(key)) {
                const model = new TaskConfigurationModel(key, this.preferences);
                model.onDidChange(() => this.onDidChangeTaskConfigEmitter.fire({ uri: key, type: FileChangeType.UPDATED }));
                model.onDispose(() => this.models.delete(key));
                this.models.set(key, model);
                this.onDidChangeTaskConfigEmitter.fire({ uri: key, type: FileChangeType.UPDATED });
            }
        }
        for (const uri of toDelete) {
            const model = this.models.get(uri);
            if (model) {
                model.dispose();
            }
            this.onDidChangeTaskConfigEmitter.fire({ uri, type: FileChangeType.DELETED });
        }
    }, 500);

                model.onDidChange(() => this.onDidChangeTaskConfigEmitter.fire({ uri: key, type: FileChangeType.UPDATED }));
                model.onDispose(() => this.models.delete(key));