@material-ui/styles/es/getStylesCreator/getStylesCreator.js

Material-UI Styles - The styling solution of Material-UI.

import _extends from "@babel/runtime/helpers/esm/extends";
import { deepmerge } from '@material-ui/utils';
import noopTheme from './noopTheme';
export default function getStylesCreator(stylesOrCreator) {
  const themingEnabled = typeof stylesOrCreator === 'function';

  if (process.env.NODE_ENV !== 'production') {
    if (typeof stylesOrCreator !== 'object' && !themingEnabled) {
      console.error(['Material-UI: The `styles` argument provided is invalid.', 'You need to provide a function generating the styles or a styles object.'].join('\n'));
    }
  }

  return {
    create: (theme, name) => {
      let styles;

      try {
        styles = themingEnabled ? stylesOrCreator(theme) : stylesOrCreator;
      } catch (err) {
        if (process.env.NODE_ENV !== 'production') {
          if (themingEnabled === true && theme === noopTheme) {
            // TODO: prepend error message/name instead
            console.error(['Material-UI: The `styles` argument provided is invalid.', 'You are providing a function without a theme in the context.', 'One of the parent elements needs to use a ThemeProvider.'].join('\n'));
          }
        }

        throw err;
      }

      if (!name || !theme.overrides || !theme.overrides[name]) {
        return styles;
      }

      const overrides = theme.overrides[name];

      const stylesWithOverrides = _extends({}, styles);

      Object.keys(overrides).forEach(key => {
        if (process.env.NODE_ENV !== 'production') {
          if (!stylesWithOverrides[key]) {
            console.warn(['Material-UI: You are trying to override a style that does not exist.', `Fix the \`${key}\` key of \`theme.overrides.${name}\`.`].join('\n'));
          }
        }

        stylesWithOverrides[key] = deepmerge(stylesWithOverrides[key], overrides[key]);
      });
      return stylesWithOverrides;
    },
    options: {}
  };
}