Using "ctx.delay" without arguments should add a realistic server response delay

Is your feature request related to a problem? Please describe. Quite often you would want a mocked response to behave similar to the actual response in terms of response time. Real servers rarely reply to requests instantly, while using res() would do so.

Describe the solution you’d like Calling ctx.delay() without arguments should implicitly create a random realistic response delay, similar to the one of the actual server.

rest.get('/numbers', (req, res, ctx) => {
  return res(ctx.delay(), ctx.json([1, 2, 3])
})

Possible implementation Check if the durationMs argument is given to the delay() function:

https://github.com/mswjs/msw/blob/4a49e733ed10cb2b11c1941160d9a46ec21182af/src/context/delay.ts#L8-L13

And if not, generate a random response delay number instead. Something similar to:

res.delay = durationMs || RANDOM_REALISTIC_RESPONSE_TIME

[UsamaHameed]

I will work on it!

[andreawyss]

default delay amount should be very short when running in node vs. when running in browser. Maybe 10ms and 600ms