[英]Typescript function inside generic interface to infer argument type
Lets say I have an interface that accepts a generic:假设我有一个接受泛型的接口:
interface ObjectKey<T extends {}>{
key: keyof T
doSomethingWithKey: (value: any) => void
}
Using it like this:像这样使用它:
interface User {
name: string,
age: number,
archived: boolean
}
const nameKey: ObjectKey<User> = {
key: 'name',
doSomethingWithKey: (value) => console.log(value) // I want to infer value type here
}
As mentioned above i want to infer the 'value' argument type.如上所述,我想推断“值”参数类型。 Something like this:
像这样:
interface ObjectKey<T extends {}>{
key: keyof T
doSomethingWithKey: (value: T[key]) => void
}
How can I achieve that?我怎样才能做到这一点?
I tried something like:我试过类似的东西:
interface ObjectKey<T extends {}>{
key: keyof T
doSomethingWithKey: (value: { [Property in keyof T]: T[Property] }[keyof T]) => void
}
But it returns all available types of T. For example if we use User interface, 'value' argument would be 'string |但它会返回所有可用的 T 类型。例如,如果我们使用用户界面,“值”参数将是“字符串 | number |
编号 | boolean'
布尔值'
We can make ObjectKey
a union type of all possible combinations by mapping over the object keys我们可以通过映射对象键使
ObjectKey
成为所有可能组合的联合类型
type ObjectKey<T extends {}> = {
[K in keyof T]: {
key: K,
doSomethingWithKey: (value: T[K]) => void
}
}[keyof T]
interface User {
name: string,
age: number,
archived: boolean
}
const nameKey: ObjectKey<User> = {
key: 'age',
doSomethingWithKey: (value) => console.log(value)
}
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