[icons] fix: correct the exported types for "@mui/icons-material" index path on v7

[laurence-hudson-mindfoundry]

• I have followed (at least) the PR section of the contributing guide.

While upgrading from v6 to v7 I noticed that the type information seems to be wrong for the index path of "@mui/icons-material". Locally I'm using Typescript 5.5.4, transpiling to both CJS & ESM.

This probably slipped through v7 testing as using the recommended ("option 1" in the docs) icon import pattern (i.e. import AccessAlarmIcon from '@mui/icons-material/AccessAlarm';) wouldn't catch this, but using the named export pattern fails (ie. import { AccessAlarm } from '@mui/icons-material';) as it gets icon.d.ts typing instead of index.d.ts.

This fix seems to work locally, but I'm not a TS/ESM packaging wizard.

[mui-bot]

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[laurence-hudson-mindfoundry]

It is unclear to me how/why this test https://github.com/mui/material-ui/blob/master/packages/mui-icons-material/test/generated-types/Test.tsx would be working without this fix; given it tests both import styles, possibly typescript version differences or esm vs cjs?

[Janpot]

@laurence-hudson-mindfoundry please open a ticket with an exact reproduction under the form of a GitHub repository or stackblitz so that we can investigate

[laurence-hudson-mindfoundry]

@laurence-hudson-mindfoundry please open a ticket with an exact reproduction under the form of a GitHub repository or stackblitz so that we can investigate

Here you go https://stackblitz.com/edit/mui7-ts-icons?file=package.json

#45697

[laurence-hudson-mindfoundry]

I spent a little while exploring the attw failure in my suggested fix, but couldn't find a permutation that both works in practice and passes attw.