Provide/Inject

Zova recommends using ioc: hierarchical injection to replace Vue3's dependency injection mechanism. Of course, Zova also supports Vue3's dependency injection mechanism, so it is compatible with the existing Vue3 ecosystem

To implement Vue3's dependency injection in Zova, there are three main steps:

1. Define the type

Use the interface merging mechanism to define the mapping relationship between key and type. To ensure global uniqueness, key uses the format of module:name to avoid naming conflicts

// in module: test-module1
import 'zova';
declare module 'zova' {
  export interface IInjectRecord {
    'test-module1:fruit': String;
  }
}

2. Provide

Provide a value ​​in the parent component

// in module: test-module1
class Parent {
  protected async __init__() {
    this.bean.provide('test-module1:fruit', 'apple');
  }
}

• this.bean is the ioc container of the current component instance

3. Inject

Inject a value ​​in child component

// in module: test-module2
class Child {
  protected async __init__() {
    const fruit = this.bean.inject('test-module1:fruit');
    const fruit2 = this.bean.inject('test-module1:fruit', 'pear');
  }
}

• this.bean is the ioc container of the current component instance

Why not use the provide/inject method provided by Vue3 directly?

The provide/inject method of Vue3 can only be used in the synchronous phase of setup. The provide/inject method encapsulated by Zova through the ioc container does not have this limitation and can be used in asynchronous methods anywhere