[code-infra] Advance eslint setup

[Janpot]

Problem

• eslint outdated, it's cascading to other dependencies
• It becomes increasingly more difficult to build on top of core eslint rules.
  See
  • https://github.com/mui/base-ui/blob/aa22b7e37c077773b0f70353794bde7ecdec6954/.eslintrc.js#L55-L59
  • https://github.com/mui/toolpad/blob/780c868daf6b2213c80cb803b890a899c8f4aca6/.eslintrc.js#L106-L108

Tasks:

• migrate to eslint v9:
  blockers:
  • wait for eslint v9 support airbnb/javascript#2961 to be solved
  • eslint-config-airbnb-typescript deprecated. Let's bring it in-house and remove stylistic rules
• shareable configs: create multiple flat configs that can be reused by dependent projects. Reuse typescript-eslint config utility

  import { configs } from '@mui/eslint'
  import tseslint from 'typescript-eslint'
  
  export default tseslint.config(
    configs.recommended,
    {
      files: ['**/*.spec.*'],
      extends: [
  	    configs.tests
  	  ]
    },
    {
      files: ['./docs'],
      extends: [
  	    configs.docs
  	  ], 
    },
  ]

  blockers:
  • migrate to flat config
    blockers:
    • wait for Support of new eslint flat config airbnb/javascript#2804 to be solved

[Janpot]

cc @michaldudak

[ZeeshanTamboli]

eslint-config-airbnb-typescript deprecated. Let's bring it in-house and remove stylistic rules

Done in mui/material-ui#45245