src/vs/workbench/contrib/extensions/browser/extensionsViews.ts/ExtensionsListView/filterLocal
class ExtensionsListView:	private filterLocal(local: IExtension[], runningExtensions: IExtensionDescription[], query: Query, options: IQueryOptions): { extensions: IExtension[], canIncludeInstalledExtensions: boolean } {
		let value = query.value;
		let extensions: IExtension[] = [];
		let canIncludeInstalledExtensions = true;

		if (/@builtin/i.test(value)) {
			extensions = this.filterBuiltinExtensions(local, query, options);
			canIncludeInstalledExtensions = false;
		}

		else if (/@installed/i.test(value)) {
			extensions = this.filterInstalledExtensions(local, runningExtensions, query, options);
		}

		else if (/@outdated/i.test(value)) {
			extensions = this.filterOutdatedExtensions(local, query, options);
		}

		else if (/@disabled/i.test(value)) {
			extensions = this.filterDisabledExtensions(local, runningExtensions, query, options);
		}

		else if (/@enabled/i.test(value)) {
			extensions = this.filterEnabledExtensions(local, runningExtensions, query, options);
		}

		else if (/@workspaceUnsupported/i.test(value)) {
			extensions = this.filterWorkspaceUnsupportedExtensions(local, query, options);
		}

		return { extensions, canIncludeInstalledExtensions };
	}