Update intro.mdx import

[minsoo-web]

This page is based on v14, so I think it should use named import.

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[MatanBobi]

@ph-fritsche Any chance to get your look at this one? I remember we had some issues with that named import?

[ahayes91]

Might be worth using this PR to update a few other places referencing v14 - https://github.com/testing-library/testing-library-docs/pull/1476/files has some examples!

[ph-fritsche]

I'm not sure…

• Direct APIs will be deprecated and removed at some point.
• Preparing the document is necessary and giving users the option to call this (and cleanup callbacks) at any point might solve compatibility issues with other frameworks/tools. feat: export callbacks for hooks user-event#1270
• A test that reuses old pointer/keyboard state might be confusing. Therefore we should keep on recommending to call setup() inside the test. Using a setup function that combines this with render function of the respecting framework gives a clean and concise test code.

// current recommendation according to docs
import userEvent, {PointerEventsCheckLevel} from '@testing-library/user-event'
const user = userEvent.setup()
await user.setup({pointerEventsCheck: PointerEventsCheckLevel.Never}).click()

// also possible, but not officially recommended
import { userEvent, PointerEventsCheckLevel} from '@testing-library/user-event'

If we expose prepare, reset and detach with the next version, we could also expose setup as named export.

import {setup, PointerEventsCheckLevel} from '@testing-library/user-event'
// or if the user prefers
import * as userEvent from '@testing-library/user-event'