typescript 带有未知属性键的打字稿接口定义
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typescript interface definition with an unknown property key
提问by bsr
How to express an interface (IResponse), with one property has a string key (which is not known statically). Below, the key valuescan be anything like books, chairs, etc. All other keys and types are known statically. Below implementationgives error. I guess the error is because the index signature on the IResponsemakes all the property values to be IValue[]. Is there a way to do this?
如何表达一个接口（IResponse），一个属性有一个字符串键（静态未知）。下面，键values可以像任何事情books，chairs等所有其它的键和类型静态已知。下面的实现给出了错误。我猜这个错误是因为 上的索引签名IResponse使所有属性值都是IValue[]. 有没有办法做到这一点？
export interface IMeta{}
export interface IValue{}
export interface IResponse {
meta: IMeta;
[index: string]:IValue[];
}
export class Response implements IResponse {
meta:IMeta;
values:IValue[];
//books:IValue[];
//anything:IValue[];
}
采纳答案by Fenton
If you define one interface for the known types and a separate one for the "unknown" types, you could use a type assertion to tell the compiler the one you wanted to use.
如果为已知类型定义一个接口，为“未知”类型定义一个单独的接口，则可以使用类型断言告诉编译器您想要使用的类型。
It isn't ideal, but you are working in a edge case (i.e. not entirely dynamic, not entirely static).
这并不理想，但您在边缘情况下工作（即不完全动态，不完全静态）。
export interface IMeta{}
export interface IValue{}
export interface IFunkyResponse {
[index: string]:IValue[];
}
export interface IResponse {
meta: IMeta;
}
export class Response implements IResponse {
meta:IMeta;
values:IValue[];
books:IValue[];
anything:IValue[];
}
You can type-assert between <IResponse> respand <IFunkyResponse> respto access one or the other of the styles.
您可以在<IResponse> resp和之间键入断言<IFunkyResponse> resp以访问一种或另一种样式。
回答by Mavrick Laakso
Old question, but here is how I solved the issue for myself.
老问题，但这是我如何为自己解决问题。
export interface Foo {
[key: string]: any;
}
{ something: 0 } as Foo => valid
{ other: 'hello' } as Foo => valid
回答by kxo
Without interface:
无接口：
const myFunc = ((myObjectWithSomeKeys: { [key: string]: any }) => {
});
