Inheritance
Inheritance is supported for properties when both the base and the extended class is marked with the
@Service() decorator. Classes which extend a class with decorated properties will receive the initialized class instances on those properties upon creation.1
import 'reflect-metadata';
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import { Container, Token, Inject, Service } from 'typedi';
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@Service()
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class InjectedClass {
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name: string = 'InjectedClass';
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}
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@Service()
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class BaseClass {
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name: string = 'BaseClass';
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@Inject()
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injectedClass: InjectedClass;
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}
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@Service()
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class ExtendedClass extends BaseClass {
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name: string = 'ExtendedClass';
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}
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const instance = Container.get(ExtendedClass);
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// instance has the `name` property with "ExtendedClass" value (overwritten the base class)
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// and the `injectedClass` property with the instance of the `InjectedClass` class
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console.log(instance.injectedClass.name);
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// logs "InjectedClass"
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console.log(instance.name);
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// logs "ExtendedClass"
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