src/vs/platform/userDataSync/common/extensionsSync.ts/getExtensionStorageState
export function getExtensionStorageState(publisher: string, name: string, storageService: IStorageService): IStringDictionary<any> {
	const extensionStorageValue = storageService.get(getExtensionId(publisher, name) /* use the same id used in extension host */, StorageScope.GLOBAL) || '{}';
	return JSON.parse(extensionStorageValue);
}