@mui/system/esm/createTheme/index.js

MUI System is a set of CSS utilities to help you build custom designs more efficiently. It makes it possible to rapidly lay out custom designs.

export { default } from "./createTheme.js";
export { default as private_createBreakpoints } from "../createBreakpoints/createBreakpoints.js";
export { default as unstable_applyStyles } from "./applyStyles.js";