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編輯 - 更新代碼來反映意見TS2417重寫時,靜態方法
我升級從TS 2.2.1一些舊代碼,TS 2.5.2,並創下了彙編問題。 當試圖編譯下面的代碼:
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);
}
}
我得到以下錯誤:
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'.
器具使用接口時是關鍵。擴展是爲了繼承,儘管這不是現在的問題。 – rjustin