packages/expect-more-jasmine/src/to-be-reg-exp.ts
/// <reference types="jasmine" />
import { isRegExp } from 'expect-more';
import { printReceived } from 'jest-matcher-utils';
declare global {
namespace jasmine {
// eslint-disable-next-line @typescript-eslint/no-unused-vars
interface Matchers<T> {
/**
* Asserts that a value is a `RegExp`.
* @example
* expect(new RegExp('i am a regular expression')).toBeRegExp();
*/
toBeRegExp(): boolean;
}
}
}
export const toBeRegExpMatcher: jasmine.CustomMatcherFactory = () => {
return {
compare(value: unknown) {
const pass = isRegExp(value);
const message = pass
? `expected ${printReceived(value)} not to be a regular expression`
: `expected ${printReceived(value)} to be a regular expression`;
return { message, pass };
},
};
};
beforeAll(() => {
jasmine.addMatchers({
toBeRegExp: toBeRegExpMatcher,
});
});