在Vue应用中，props用于父组件向子组件传递数据，但在复杂组件树中逐层传递会很繁琐。provide和inject模式可以简化数据流动，父组件用provide提供数据，子组件用inject获取，减少代码冗余，适合深层嵌套组件。需注意provide的数据默认非响应式，可用ref或reactive使其响应变化。

在Vue3 + TS项目中，使用Provide/Inject可以简单地处理深层组件间传值的问题。但是需要考虑命名冲突、类型提示和严格注入三个问题。可以使用Symbol类型的数据来解决命名冲突问题。使用InjectionKey来定义注入变量的类型以获得类型提示。在使用inject时，可以使用默认值来处理先人组件未提供的情况。可以封装一个工具函数来抛出错误而不是警告。

Vue3 provide和inject原理 🔗packages/runtime-core/src/apiInject.ts “version”: “3.3.0” provide和inje

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