问题描述

我一直在 寻找 around 这个问题似乎是一个 重复发生的事情.但是，我发现的解决方案似乎都不适合我.

I've been looking around and this question seems like a recurring thing. However, none of the solutions I've found seem to work for me.

使用以下内容:

{
  "typescript": "2.3.2",
  "jasmine-core": "2.6.1",
  "@types/jasmine": "2.5.47"
}

我无法让 Typescript 合并包含我的自定义匹配器定义的命名空间声明.

I can't get Typescript to merge the namespace declaration containing my custom matcher definition.

添加这个:

declare namespace jasmine {
  interface Matchers<T> {
    toBeAnyOf(expected: jasmine.Expected<T>, expectationFailOutput?: any): boolean;
  }
}

隐藏之前在 jasmine 上声明的所有其他类型.编译器输出错误如:

Hides every other type previously declared on jasmine. Compiler outputs errors such as:

[ts] Namespace 'jasmine' has no exported member 'CustomMatcherFactories'
[ts] Namespace 'jasmine' has no exported member 'CustomMatcher'.

是否有任何适当的方法可以添加自定义匹配器并使其与 Typescript 很好地配合使用?

Is there any proper way to add a custom matcher and make it play nicely with Typescript?

如果您使用的是 tslint:recommended 规则集，则 tslint 会出现其他问题.这些规则不允许使用 namespace 或 module 关键字，所以我不得不禁用 linter(或更改 "no-namespace" 规则)为了试试这个.如果不推荐"，不确定如何绕过扩展定义.

There's an additional issue with tslint if you are using tslint:recommended ruleset. Those rules disallow the usage of namespace or module keywords, so I had to disable the linter (or change the "no-namespace" rule) in order to try this out. Unsure how one would get around extending definitions if this is "not recommended".

推荐答案

我在添加自定义匹配器时不得不修改三个文件.我创建了一个名为 matchers.ts 的文件，其中包含实际的匹配器.然后，我为我的 matchers.ts 文件添加了对 test.ts 的导入.最后，我在包含匹配器的 typings.d.ts 文件中添加了一个接口.

I had to modify three files when I added custom matchers. I created a file called matchers.ts that contained the actual matchers. I then added an import to test.ts for my matchers.ts file. Finally, I added an interface to the typings.d.ts file which contains my matcher.

matchers.ts(任意名称)

matchers.ts (arbitrary name)

beforeEach(() => {
    jasmine.addMatchers({
        toContainText: () => {
            return {
                compare: (actual: HTMLElement, expectedText: string, customMessage?: string) => {
                    const actualText = actual.textContent;
                    return {
                        pass: actualText.indexOf(expectedText) > -1,
                        get message() {
                            let failureMessage = 'Expected ' + actualText + ' to contain ' + expectedText;

                            if (customMessage) {
                                failureMessage = ' ' + customMessage;
                            }

                            return failureMessage;
                        }
                    };
                }
            };
        },
    });
});

test.ts

import 'test/test-helpers/global/matchers'; (my relative filepath)

typings.d.ts

typings.d.ts

declare module jasmine {
  interface Matchers {
    toContainText(text: string, message?: string): boolean;
  }
}

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