原始問題

issue 里提到的 UserAccountService：

實現了 UserAccountFacade.

如果直接導入 UserAccountService：

import { UserAccountService } from ‘@spartacus/user/account/core’;

報錯：

main.ts:14 Error: NullInjectorError: No provider for UserAccountService!
at NullInjector.get (core.js:1013) [angular]
at R3Injector.get (core.js:11173) [angular]
at R3Injector.get (core.js:11173) [angular]
at R3Injector.get (core.js:11173) [angular]
at injectInjectorOnly (core.js:899) [angular]

解決方案：

import { UserAccountFacade } from ‘@spartacus/user/account/root’

The actual services are lazily loaded, so that only when you use it, the additional js will be loaded. This requires however that you inject the facade instead, so that we can do the magic of loading the service lazily.

需要注入 facade，讓 facade 執行延遲加載。

總結

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