Typescript Can't implement generic function interface
AdMer
I'm trying to implement a generic function interface and I cannot make it work.
IToken.ts
export interface IToken {
token: string;
expires: number;
}ITokenMapper.ts
export interface ITokenMapper {
<T>(apiResult: any): T;
}tokenMapper.ts
import {ITokenMapper} from "./interfaces/ITokenMapper";
import {IToken} from "./interfaces/IToken";
export const tokenMapper: ITokenMapper = function <IToken>(apiResult: any): IToken {
if(apiResult.token && apiResult.expires) {
return {token: apiResult.token as string, expires: apiResult.expires as number}
}
throw new Error('Unable to parse token');
};Here is a screenshot from tokenMapper.ts saying IToken import is unused but I should have a use for it:
Edit : Using Typescript 3.0.3
Joe
I believe you can accomplish your typing with a generic interface ITokenMapper<T>
interface IToken {
token: string;
expires: number;
}
interface ITokenMapper<T> {
(apiResult: T): T;
}
const tokenMapper: ITokenMapper<IToken> = function (apiResult) {
if(apiResult.token && apiResult.expires) {
return { token: apiResult.token as string, expires: apiResult.expires as number};
}
throw new Error('Unable to parse token');
};
From: https://www.typescriptlang.org/docs/handbook/generics.html#generic-types
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