src/vs/workbench/services/extensionManagement/common/extensionManagementService.ts/ExtensionManagementService/getInstalled
class ExtensionManagementService:	async getInstalled(type?: ExtensionType, profileLocation?: URI): Promise<ILocalExtension[]> {
		const result = await Promise.all(this.servers.map(({ extensionManagementService }) => extensionManagementService.getInstalled(type, profileLocation)));
		return flatten(result);
	}