GoScrobble/web/node_modules/@material-ui/system/es/compose.js

import _extends from "@babel/runtime/helpers/esm/extends";
import merge from './merge';

function compose(...styles) {
  const fn = props => styles.reduce((acc, style) => {
    const output = style(props);

    if (output) {
      return merge(acc, output);
    }

    return acc;
  }, {}); // Alternative approach that doesn't yield any performance gain.
  // const handlers = styles.reduce((acc, style) => {
  //   style.filterProps.forEach(prop => {
  //     acc[prop] = style;
  //   });
  //   return acc;
  // }, {});
  // const fn = props => {
  //   return Object.keys(props).reduce((acc, prop) => {
  //     if (handlers[prop]) {
  //       return merge(acc, handlers[prop](props));
  //     }
  //     return acc;
  //   }, {});
  // };


  fn.propTypes = process.env.NODE_ENV !== 'production' ? styles.reduce((acc, style) => _extends(acc, style.propTypes), {}) : {};
  fn.filterProps = styles.reduce((acc, style) => acc.concat(style.filterProps), []);
  return fn;
}

export default compose;