Alexey Kozlenkov

[material-ui][Alert] Add ability to override slot props

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- [x] I have followed (at least) the [PR section of the contributing guide](https://github.com/mui/material-ui/blob/HEAD/CONTRIBUTING.md#sending-a-pull-request). Fixes #42601

[material-ui][Alert] TS error when using slotProps with customised component

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### Steps to reproduce Link to live example: https://codesandbox.io/p/sandbox/damp-monad-sptgfr?file=%2Fsrc%2FDemo.tsx%3A12%2C4 Steps: 1. Check out TS error in `slotProps` ### Current behavior On example of Alert component (it's likely a common issue):...

### Clear and concise description of the problem An option to enforce styling for TS union/intersection operators when they going multiline, just like [operator-linebreak](https://eslint.style/rules/js/operator-linebreak) does for JS operators. Example: ```ts...

[Bug]: CSF3 breaks passing primitive value to an arg of a wider type (e.g. ReactNode)

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### Describe the bug With CSF3 approach, when opening story canvas in New Tab (`/iframe.html`) mode, it's impossible to pass a value (e.g. string) for a property of complex type...

[Bug]: `spy.mockReset()` breaks following mock usage

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### Version 29.7.0 ### Steps to reproduce 0. You write test for function A that calls function B. 1. You want to mock function B **for all but one test...