代码IDE提示编译报错：Type 'TextTest' is not assignable to type 'ITest<T>'.
Type ‘TextTest’ is not assignable to type ‘ITest<T>’. The types returned by ‘getContent()’ are incompatible between these types. Type ‘TextContent’ is not assignable to type ‘T’. ‘TextContent’ is assignable to the constraint of type ‘T’, but ‘T’ could be instantiated with a different subtype of constraint ‘BaseContent’. <ArkTSCheck>
interface ITest<T extends BaseContent> {
getContent(): T
}
class BaseContent {
}
class TextContent extends BaseContent {
}
class TextTest implements ITest<TextContent>{
getContent(): TextContent {
return new TextContent()
}
}
class ContentFactory{
static getTest<T extends BaseContent>():ITest<T>{
return new TextTest()
}
}
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因为getTest函数返回类型是ITest<T>，修改成如下即可（增加as处理）：