我运行了我使用"jest"编写的测试，我收到了一个意外的错误"TypeError:p.re

Question

>我写了一个类PerlRegExp，继承了RegExp，并添加了一个replace方法。当我运行我用jest编写的测试时，我收到了一个意外的错误TypeError: p.replace is not a function

PerlRegExp

export class PerlRegExp extends RegExp {
constructor(pattern: string, flags: string) {
super(handlePattern(pattern, flags), handleFlags(flags));
}
replace(string: string, replaceValue: string) {
// ...
}
}

测试代码

import { PerlRegExp } from "../src";
describe("PerlRegExp", () => {
it("replace test \u", () => {
const p = new PerlRegExp(" (?:- (\w) ) ", "xig");
const r = p.replace("color-red", "\u$1");
expect(r).toBe("colorRed");
});
});

测试期间出现意外结果

λ npm t
> perl-regexp@0.1.0 test D:ajanuwperl-regexp
> jest
FAIL  test/perl-regexp.test.ts
PerlRegExp
× replace test u (3ms)
● PerlRegExp › replace test u
TypeError: p.replace is not a function
3 |   it("replace test \u", () => {
4 |     const p = new PerlRegExp(" (?:- (\w) ) ", "xig");
> 5 |     const r = p.replace("color-red", "\u$1");
|                 ^
6 |     expect(r).toBe("colorRed");
7 |   });
8 |
at Object.<anonymous> (test/perl-regexp.test.ts:5:17)
Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        4.893s, estimated 5s
Ran all test suites.
npm ERR! Test failed.  See above for more details.

我不知道问题出在哪里，因为PerlRegExp可以正常运行，除了测试过程中的此错误，请帮助我，谢谢。

Answer 1

通过扩展RegExp.prototype:)来解决

declare global {
interface RegExp {
replace(str: string, replaceValue: string): string;
}
}
RegExp.prototype.replace = function(str: string, replaceValue: string) {
// ...
};
export class PerlRegExp extends RegExp {
constructor(pattern: string, flags: string) {
super(handlePattern(pattern, flags), handleFlags(flags));
}
replace(str: string, replaceValue: string) {
return super.replace(str, replaceValue);
}
}