Not working as expected about cypress-wait-until

[NoriSte]

First of all: it's not ideal having the same timeout for cy.request and cy.waitUntil. The latter should have a 4x, 5x, 10x timeout. Anyway, this is not the main problem...

The main error is that checkFunction, the first parameter of cy.waitUntil, doesn't return a truthy value. The README says

checkFunction: a function that must return a truthy value when the wait is over.

while your function returns cy.request('GET', baseUrl, { failOnStatusCode: false, timeout: 60000 }).

Change your code to

before(() => {
  cy.waitUntil(() =>
    cy.request('GET', baseUrl, { failOnStatusCode: false, timeout: 60000 })
      .then(({status}) => status === 200), 
  { timeout: 60000 });
});