Changes legacy timers to modern timers in Jest v27

[voicis]

It's impossible to use wait-for-expect and legacy fake timers with Jest v27.

If you set legacy timers in jest config https://jestjs.io/docs/configuration#timers-string, which enables legacy timers for all tests, however after you call waitForExpect it changes to modern timers and they will be used for the rest of the test.

I suspect that this is because the following code which now sets modern timers by default.

wait-for-expect/src/helpers.ts

Line 22 in 6be6e2e

jest.useFakeTimers();

[connorshea]

My solution is somewhat specific but my problem appears to be a combination of this issue and one related to my usage of the msw library. mswjs/msw#1163

I solved it by replacing waitForExpect with waitFor from @testing-library/vue (which needs to be the next version, the stable version doesn't support Vue 3 yet)