TS2417重写时，静态方法

Question

编辑 - 更新代码来反映意见

我升级从TS 2.2.1一些旧代码，TS 2.5.2，并创下了汇编问题。 当试图编译下面的代码：

export interface IFuture<TResult> { 
    done(callback: (result: TResult) => void): IFuture<TResult>; 
} 
export interface IVoidFuture extends IFuture<void | any> { 
    done(callback: (result?: void) => void): IVoidFuture; 
} 

export class Future<TResult> implements IFuture<TResult>{ 
    public static createResolved<TResult>(result?: TResult): IFuture<TResult> { 
     let asyncResult: Future<TResult> = new Future<TResult>(); 
     return asyncResult; 
    } 


    public done(callback: (result: TResult) => void): Future<TResult> { 
     return this; 
    } 
} 

export class VoidFuture extends Future<void> implements IVoidFuture { 
    private static _resolvedFuture: IVoidFuture; 

    public static createResolved(result?: void): IFuture<void> { 
     if (!VoidFuture._resolvedFuture) { 
      VoidFuture._resolvedFuture = Future.createResolved<void>(); 
     } 
     return VoidFuture._resolvedFuture; 
    } 

    public done(callback: (result?: void) => void): IVoidFuture { 
     return super.done(callback); 
    } 
} 

我得到以下错误：

file.ts(20,14): error TS2417: Class static side 'typeof VoidFuture' incorrectly extends base class static side 'typeof Future'. 
    Types of property 'createResolved' are incompatible. 
    Type '(result?: void) => IVoidFuture' is not assignable to type '<TResult>(result?: TResult) => IFuture<TResult>'. 
     Types of parameters 'result' and 'result' are incompatible. 
     Type 'TResult' is not assignable to type 'void'. 

Answer 1

，因为它是书面的VoidFuture类应实现的接口。未来与预期的未来不符。也许你想要未来？

export interface IFuture<TResult> { 
 
    done(callback: (result: TResult) => void): IFuture<TResult>; 
 
} 
 
export interface IVoidFuture extends IFuture<void | any> { 
 
    done(callback: (result?: void) => void): IVoidFuture; 
 
} 
 

 
export class Future<TResult> { 
 
    public static createResolved<TResult>(result?: TResult): IFuture<TResult> { 
 
     let asyncResult: Future<TResult> = new Future<TResult>(); 
 
     return asyncResult; 
 
    } 
 
    public done(callback: (result: TResult) => void): Future<TResult> { 
 
     return this; 
 
    } 
 
} 
 
export class VoidFuture implements Future<TResult> {//needs to match interface definition 
 
    private static _resolvedFuture: IVoidFuture; 
 
    public static createResolved(result?: void): IVoidFuture { 
 
     if (!VoidFuture._resolvedFuture) { 
 
      VoidFuture._resolvedFuture = Future.createResolved<void>(); 
 
     } 
 
     return VoidFuture._resolvedFuture; 
 
    } 
 

 
    public done(callback: (result?: void) => void): IVoidFuture { 
 
     return super.done(callback); 
 
    } 
 
}