frontend/node_modules/@mui/utils/esm/capitalize/capitalize.js

import _formatMuiErrorMessage from "@mui/utils/formatMuiErrorMessage";
// It should to be noted that this function isn't equivalent to `text-transform: capitalize`.
//
// A strict capitalization should uppercase the first letter of each word in the sentence.
// We only handle the first word.
export default function capitalize(string) {
  if (typeof string !== 'string') {
    throw new Error(process.env.NODE_ENV !== "production" ? `MUI: \`capitalize(string)\` expects a string argument.` : _formatMuiErrorMessage(7));
  }
  return string.charAt(0).toUpperCase() + string.slice(1);
}