@mui/material/modern/styles/createThemeNoVars.js

Material UI is an open-source React component library that implements Google's Material Design. It's comprehensive and can be used in production out of the box.

import _formatErrorMessage from "@mui/utils/formatMuiErrorMessage";
import deepmerge from '@mui/utils/deepmerge';
import styleFunctionSx, { unstable_defaultSxConfig as defaultSxConfig } from '@mui/system/styleFunctionSx';
import systemCreateTheme from '@mui/system/createTheme';
import generateUtilityClass from '@mui/utils/generateUtilityClass';
import createMixins from "./createMixins.js";
import createPalette from "./createPalette.js";
import createTypography from "./createTypography.js";
import shadows from "./shadows.js";
import createTransitions from "./createTransitions.js";
import zIndex from "./zIndex.js";
import { stringifyTheme } from "./stringifyTheme.js";
function createThemeNoVars(options = {}, ...args) {
  const {
    breakpoints: breakpointsInput,
    mixins: mixinsInput = {},
    spacing: spacingInput,
    palette: paletteInput = {},
    transitions: transitionsInput = {},
    typography: typographyInput = {},
    shape: shapeInput,
    ...other
  } = options;
  if (options.vars &&
  // The error should throw only for the root theme creation because user is not allowed to use a custom node `vars`.
  // `generateThemeVars` is the closest identifier for checking that the `options` is a result of `createTheme` with CSS variables so that user can create new theme for nested ThemeProvider.
  options.generateThemeVars === undefined) {
    throw new Error(process.env.NODE_ENV !== "production" ? 'MUI: `vars` is a private field used for CSS variables support.\n' +
    // #host-reference
    'Please use another name or follow the [docs](https://mui.com/material-ui/customization/css-theme-variables/usage/) to enable the feature.' : _formatErrorMessage(20));
  }
  const palette = createPalette(paletteInput);
  const systemTheme = systemCreateTheme(options);
  let muiTheme = deepmerge(systemTheme, {
    mixins: createMixins(systemTheme.breakpoints, mixinsInput),
    palette,
    // Don't use [...shadows] until you've verified its transpiled code is not invoking the iterator protocol.
    shadows: shadows.slice(),
    typography: createTypography(palette, typographyInput),
    transitions: createTransitions(transitionsInput),
    zIndex: {
      ...zIndex
    }
  });
  muiTheme = deepmerge(muiTheme, other);
  muiTheme = args.reduce((acc, argument) => deepmerge(acc, argument), muiTheme);
  if (process.env.NODE_ENV !== 'production') {
    // TODO v6: Refactor to use globalStateClassesMapping from @mui/utils once `readOnly` state class is used in Rating component.
    const stateClasses = ['active', 'checked', 'completed', 'disabled', 'error', 'expanded', 'focused', 'focusVisible', 'required', 'selected'];
    const traverse = (node, component) => {
      let key;

      // eslint-disable-next-line guard-for-in
      for (key in node) {
        const child = node[key];
        if (stateClasses.includes(key) && Object.keys(child).length > 0) {
          if (process.env.NODE_ENV !== 'production') {
            const stateClass = generateUtilityClass('', key);
            console.error([`MUI: The \`${component}\` component increases ` + `the CSS specificity of the \`${key}\` internal state.`, 'You can not override it like this: ', JSON.stringify(node, null, 2), '', `Instead, you need to use the '&.${stateClass}' syntax:`, JSON.stringify({
              root: {
                [`&.${stateClass}`]: child
              }
            }, null, 2), '', 'https://mui.com/r/state-classes-guide'].join('\n'));
          }
          // Remove the style to prevent global conflicts.
          node[key] = {};
        }
      }
    };
    Object.keys(muiTheme.components).forEach(component => {
      const styleOverrides = muiTheme.components[component].styleOverrides;
      if (styleOverrides && component.startsWith('Mui')) {
        traverse(styleOverrides, component);
      }
    });
  }
  muiTheme.unstable_sxConfig = {
    ...defaultSxConfig,
    ...other?.unstable_sxConfig
  };
  muiTheme.unstable_sx = function sx(props) {
    return styleFunctionSx({
      sx: props,
      theme: this
    });
  };
  muiTheme.toRuntimeSource = stringifyTheme; // for Pigment CSS integration

  return muiTheme;
}
export default createThemeNoVars;