src/vs/workbench/contrib/extensions/browser/extensionsWorkbenchService.ts/ExtensionsWorkbenchService/local
class ExtensionsWorkbenchService:	get local(): IExtension[] {
		const byId = groupByExtension(this.installed, r => r.identifier);
		return byId.reduce((result, extensions) => { result.push(this.getPrimaryExtension(extensions)); return result; }, []);
	}