Aarón García Hervás

[core] Bump React to 19

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Part of https://github.com/mui/material-ui/issues/42381 This PR serves as a sandbox to check how many issues we have left to solve to support React 19.

[core] Set up eslint-plugin-testing-library

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Part of https://github.com/mui/mui-public/issues/173. Sets up [eslint-plugin-testing-library](https://github.com/testing-library/eslint-plugin-testing-library) and fix related issues. Two rules have been disabled given the amount of errors reported: - [prefer-screen-queries](https://github.com/testing-library/eslint-plugin-testing-library/blob/main/docs/rules/prefer-screen-queries.md): 2146 errors - [no-container](https://github.com/testing-library/eslint-plugin-testing-library/blob/main/docs/rules/no-container.md): 576 errors

[core] Fix eslint-plugin-react-compiler issues

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Part of https://github.com/mui/material-ui/issues/42548 As part of adopting the [official ESLint plugin for the React Compiler](https://react.dev/learn/react-compiler#installing-eslint-plugin-react-compiler), we want to solve all of the reported issues. ## Contributing 1. Pick a file...

[core] typescript-next pipeline runs out of memory

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We run TypeScript tests against `typescript@next` nightly. The pipeline (`typescript-next`) fails in the "Tests TypeScript definitions" step with the following error: ``` FATAL ERROR: Reached heap limit Allocation failed -...

[test][docs] Improve demos for better regression screenshots

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Follow up on https://github.com/mui/material-ui/pull/43656#issuecomment-2348446752 Some demos were using `flex` instead of `inline-flex` in their top-level elements, causing them to look off when rendered inside a `block` element instead of a...

[material-ui][docs] Document Typography color prop breaking change

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Resolves https://github.com/mui/material-ui/issues/43589 We documented the deprecation of system props in the v6 upgrade guide: https://mui.com/material-ui/migration/migrating-from-deprecated-apis/#system-props. But we introduced a breaking change in the `color` prop of the `Typography` component: it's...

### Context Not so long ago, a [PR](https://github.com/styled-components/styled-components/pull/4333) replaced all usages of the [deprecated](https://react.dev/blog/2024/04/25/react-19-upgrade-guide#the-jsx-namespace-in-typescript) `JSX` namespace with `React.JSX` in this repo. We thought that was enough for MUI packages to...