新的Typescript 1.8.4构建错误:“生成:属性'result'在'EventTarget'类型上不存在. " [英] New Typescript 1.8.4 build error: " Build: Property 'result' does not exist on type 'EventTarget'. "

问题描述

我是打字稿新手.在我的Durandal应用程序中，我将VS-2012迁移到VS-2015，这意味着将打字稿0.9转换为打字稿1.8.4.迁移后，我遇到了很多构建错误.我解决了除一个以外的所有问题.我遇到以下有关事件类型的构建错误.

I am New to typescript. In my Durandal application I migrated to VS-2012 to VS-2015 means typescript 0.9 to typescript 1.8.4. After migrated I got so many build errors. I resolved all those except one. I am getting below build error on types of Events.

错误:内部版本:类型'EventTarget'不存在属性'result'"

代码与下面的代码完全一样:

And the code was exactly like this below:

var reader:any,
target:EventTarget;

reader= new FileReader();
reader.onload = function (imgsrc){
    var fileUrl = imgsrc.target.result;
}

"Imgsrc"正在接受类型事件.

"Imgsrc" is taking type event.

它与打字稿0.9可以正常工作，但对于1.8.4来说，它会抛出错误，因为'EventTarget'类型上不存在'结果'. 谁能帮忙解决这个问题.

It's working fine with typescript 0.9 but with 1.8.4 it's throwing error as 'result' does not exist on type 'EventTarget'. Can any one help on this to resolve.

注意:"target:EventTarget"是从lib.d.ts获取的

推荐答案

any 是药物(几乎可以用于任何用途，但是... TypeScript的优点在哪里) ...报告了类似的问题，并提出了不错的(TypesScript-ish)解决方法

While any is a medicine (almost for anything, but... where is the TypeScript benefit then)... there is a similar issue reported and nice (TypesScript-ish) workaround suggested

让我引用:

我遇到了这个TS2339:类型上的属性结果"不存在 加载JS FileReader时出现"EventTarget"，并针对 传递给FileReader的onerror的事件的getSummary().

I ran into this TS2339: Property 'result' does not exist on type 'EventTarget' in JS FileReader onload, and another warning for getSummary() on the event passed to FileReader's onerror.

我的解决方法是抑制可怕的红色蠕变线条；-)是 以下:

My work-around, to suppress the horrid red squiggily lines;-) is the following:

interface FileReaderEventTarget extends EventTarget {
    result:string
}

interface FileReaderEvent extends Event {
    target: FileReaderEventTarget;
    getMessage():string;
}

然后在我的应用中:

reader.onload = function(fre:FileReaderEvent) {
    var data = JSON.parse(fre.target.result);
    ...
}

并且，直到lib.d.ts进行了一些更改，我们仍然可以使用已知接口进行工作

And, until some change in lib.d.ts, we still do work with known interface

2019年12月修改:

EDIT Dec 2019:

使用此修复程序，您可能会得到

With this fix, you might be getting

错误TS2322:类型'(this:FileReader，e:FileReaderEvent)=> void'不能分配给类型'(this:FileReader，ev:ProgressEvent)=>任何'.

error TS2322: Type '(this: FileReader, e: FileReaderEvent) => void' is not assignable to type '(this: FileReader, ev: ProgressEvent) => any'.

如果是这样，只需替换

 interface FileReaderEvent extends Event {

使用

 interface FileReaderEvent extends ProgressEvent {

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