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The type 'string' cannot be directly assigned to the Icon type in Material UI. However, you can use the 'createMuiTheme' function from the '@material-ui/core/styles' module to create a theme with a custom icon mapping. Here's an example:

import createMuiTheme from '@material-ui/core/styles/createMuiTheme';
import { icons } from '@material-ui/icons';

// Define a custom icon mapping
const customIcons = {
  myIcon: {
    // Replace 'myIcon' with the name of your custom icon
    path: icons.myIcon.path,
    viewBox: icons.myIcon.viewBox,
  },
};

// Create a Material UI theme with the custom icon mapping
const theme = createMuiTheme({
  overrides: {
    MuiSvgIcon: {
      root: {
        // Replace 'myIcon' with the name of your custom icon
        '&.myIcon': {
          '& svg': {
            fill: 'currentColor',
            width: '1em',
            height: '1em',
          },
          '& path': {
            d: customIcons.myIcon.path,
            viewBox: customIcons.myIcon.viewBox,
          },
        },
      },
    },
  },
});

// Now you can use your custom icon like this:
import MyIcon from '@material-ui/icons/MyIcon';

<MyIcon className="myIcon" />