Question

我发现了一个场景，我可以可靠地让TypeScript编译器失败并显示错误消息：“内部错误：无法获取属性'publicMembers'的值：object is null或undefined”

这是我的Repro.ts文件：

interface Callback { (data: any): void; }

class EventSource1 {
    addEventHandler(callback: Callback): void { }
}

class EventSource2 {
    onSomeEvent: Callback;
}

export class Controller {
    constructor () {
        var eventSource = new EventSource1();
        // Commenting the next line will allow it to compile.
        eventSource.addEventHandler(msg => this.handleEventFromSource1(msg));
    }
    private handleEventFromSource1(signalState) {
        console.log('Handle event from source 1');
        var eventSource2 = new EventSource2();
        // Commenting the next line will allow it to compile.
        eventSource2.onSomeEvent = msg => this.handleEventFromSource2(msg);
    }
    private handleEventFromSource2(event) {
        console.log("Handling event from source 2.");
    }
}

这很可能是TypeScript compiler crash: publicMembers is null or undefined的副本，但是复制品的复杂程度要低得多，所以我想我会继续发布它。

有什么想法吗？

Answer 1

我已将此添加到bug over on Codeplex。

如果您还没有证明这也是一个问题，您应该投票支持该错误。

由于你是对的，没有什么可以添加到答案中 - 这是编译器中的一个错误。我们只需要等待修复。

Answer 2

另一种解决方法。为方法声明void返回类型：

private handleEventFromSource1(signalState): void { ... }
private handleEventFromSource2(event): void { ... }

Answer 3

对于它的价值，到目前为止我找到的问题的最佳解决方法（直到他们修复编译器错误）是避免命名的Callback接口。换句话说，这段代码运行得很好：

class EventSource1 {
    addEventHandler(callback: { (data: any): void; }): void { }
}

class EventSource2 {
    onSomeEvent: { (data: any): void; };
}

class Controller {
    constructor () {
        var eventSource = new EventSource1();
        eventSource.addEventHandler(msg => this.handleEventFromSource1(msg));
    }
    private handleEventFromSource1(signalState) {
        console.log('Handle event from source 1');
        var eventSource2 = new EventSource2();
        eventSource2.onSomeEvent = msg => this.handleEventFromSource2(msg);
    }
    private handleEventFromSource2(event) {
        console.log("Handling event from source 2.");
    }
}

Typescript编译器错误：“无法获取属性'publicMembers'的值：object为null或undefined”

3 个答案: