使用'<>'进行断言被禁止，使用"as"代替? [英] Type assertion using the '<>' is forbidden,use 'as' instead?

问题描述

我的规格中有以下测试用例，

I have the following test case in my spec,

it (should create,()=>{
     const url  = (<jasmine.spy> http.get).calls.args(0)[0]
     expect(url).toBe('/api/get')
});  

运行它时，出现以下棉绒错误.

When I run it, I am getting the following lint error.

Type assertion using the '<>' is forbidden, use as instead?

任何人都可以建议帮助.

Can anyone please suggest help.

推荐答案

来自

类型断言

as foo与<foo>

最初添加的语法为<foo>.如下所示:

Originally the syntax that was added was <foo>. This is demonstrated below:

var foo: any;
var bar = <string> foo; // bar is now of type "string"

但是，在JSX中使用<foo>样式断言时，语言语法存在歧义:

However, there is an ambiguity in the language grammar when using <foo> style assertions in JSX:

var foo = <string>bar;
</string>

因此，现在建议您只使用as foo来保持一致性.

Therefore it is now recommended that you just use as foo for consistency.

因此，lint警告过时的语法.

So the linter warns about the old syntax.

因此，在这种情况下，这是新语法:

So in this case, this is in the new syntax:

const url  = (http.get as jasmine.spy).calls.args(0)[0]

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