Multiple declare module '@mui/material/Button' don't work

Duplicates

• I have searched the existing issues

Latest version

• I have tested the latest version

Current behavior 😯

The current advise is to use the following code

declare module '@mui/material/Button' {
  interface ButtonPropsVariantOverrides {
    pill2: true
  }
}

This works if they are in the same file, you can see that pill2 is recognized:

If I move the second declaration to another file it isn’t picked up anymore:

If I replace the import paths with '@mui/material/Button/Button' it works as expected:

Expected behavior 🤔

The documentation should probably advise the following code:

declare module '@mui/material/Button/Button' {
  interface ButtonPropsVariantOverrides {
    pill2: true
  }
}

Steps to reproduce 🕹

See screenshots in Current behavior.

Context 🔦

We have some base declarations we want to make and allow ‘implementors’ add new declarations.

Your environment 🌎

`npx @mui/envinfo`

 System:
    OS: macOS 12.2.1
  Binaries:
    Node: 14.19.0 - ~/.nvm/versions/node/v14.19.0/bin/node
    Yarn: 1.19.1 - ~/.nvm/versions/node/v14.19.0/bin/yarn
    npm: 6.14.16 - ~/.nvm/versions/node/v14.19.0/bin/npm
  Browsers:
    Chrome: 99.0.4844.51
    Edge: 99.0.1150.36
    Firefox: Not Found
    Safari: 15.3

[jmas]

I had the same issue and I fixed it by wrapping into declare global:

declare global {
  declare module "@mui/material/Button" {
    interface ButtonPropsVariantOverrides {
      special: true;
      footer: true;
    }
  }

  declare module "@mui/material/Typography" {
    interface TypographyPropsVariantOverrides {
      h1: true;
      h2: true;
      h3: false;
      h4: false;
      h5: false;
      h6: false;
    }
  }
}

[rus-yurchenko]

I believe the issue is caused not by multiple declarations. I use only a single declaration for Button, which is located in a separate file and it doesn’t work as well.

As was mentioned, @mui/material/Button/Button works across the project, while simple @mui/material/Button located in a separate file - doesn’t.