Do hooks run synchronously or in an asynchronous way?

[YevheniiaMazur]

I am an old user of Cypress and remember that for the first versions, there was some information in cypress.io that Cypress is built on Bluebird promises.

Today I wasn't able to find any such detailed information. Only that cypress commands are promises.
Am I right and Cypress implemented hooks (such as before or beforeAll) also by wrapping them into promises?

And is it safe to use an approach like this:

describe('some description here', () => {
beforeEach('first group of before each commands', () => {
//do something here
});

beforeEach('second group of before each commands', () => {
//do something here
})

it('some random tests', () => {
})

})

Based on the documentation I thought that this potentially could cause both beforeEach hooks executed asynchronously. But I haven't found any confirmation or denial in the documentation