*babel-plugin-transform-mui-imports.md

babel-plugin-transform-mui-imports

A plugin to make authoring with MUI components efficient, both for humans and bundlers.

Here's why:

✍️ What you write	👏 What your bundler sees
import { AppBar, List, ListItem, ListItemAction, makeStyles } from "@material-ui/core"; import { Add } from '@material-ui/icons';	import AppBar from "@material-ui/core/esm/AppBar"; import List from "@material-ui/core/esm/List"; import ListItem from "@material-ui/core/esm/ListItem"; import ListItemAction from "@material-ui/core/esm/ListItemAction"; import { makeStyles } from "@material-ui/core/esm/styles"; import Add from "@material-ui/icons/esm/Add";

Installation

1. Get it from npm:

npm i babel-plugin-transform-mui-imports

2. Put it in your Babel config:

{ "plugins": ["transform-mui-imports"] }

---

Try it out on ASTExplorer

babel-plugin-transform-mui-imports.js

module.exports = function ({ types: t }) {
  return {
    name: "transform-mui-imports",
    visitor: {
      ImportDeclaration(path, state) {
        const source = path.node.source.value;
        if (!/(@material-ui\/(core|icons))$/.test(source)) return;
        path.replaceWithMultiple(path.get('specifiers').map(s => {
          let specificSource = source + (state.opts.esm===false ? '' : '/esm');
          let specifier = t.clone(s.node);
          // ignore wildcard and default imports that can't be exploded
          if (!t.isImportDefaultSpecifier(s) && !t.isImportNamespaceSpecifier(s)) {
            const name = s.node.imported.name;
            if (name === 'colors') {
              // import { colors } from '..' --> import * as colors from '/colors'
              specifier = t.importNamespaceSpecifier(specifier.local);
              specificSource += '/colors';
            }
            else if (/^(makeStyles|createStyles|createMuiTheme|responsiveFontSizes|styled|useTheme|withStyles|withTheme|createGenerateClassName|jssPreset|ServerStyleSheets|StylesProvider|MuiThemeProvider|ThemeProvider|easing|duration|hexToRgb|rgbToHex|hslToRgb|decomposeColor|recomposeColor|getContrastRatio|getLuminance|emphasize|fade|darken|lighten)$/.test(name)) {
              // core re-exports all of /styles
              // import { styled } from '..' --> import { styled } from '/styles'
              specifier = t.clone(s.node);
              specificSource += '/styles';
            }
            else {
              // import { List } from '..' --> import List from '/esm/List'
              specifier = t.importDefaultSpecifier(specifier.local);
              specificSource += '/' + name;
            }
          }
          return t.importDeclaration([specifier], t.stringLiteral(specificSource));
        }));
      }
    }
  };
}

package.json

{
  "name": "babel-plugin-transform-mui-imports",
  "version": "0.2.0",
  "author": "Jason Miller (https://github.com/developit)",
  "main": "babel-plugin-transform-mui-imports.js",
  "repo": "gist:037baaec2a0",
  "homepage": "https://gist.github.com/developit/037baaec2a0a1e64e628c84fdd5c1107",
  "scripts": { "prepack": "mv *babel-plugin-transform-mui-imports.md README.md", "postpack": "mv README.md *babel-plugin-transform-mui-imports.md" },
  "peerDependencies": {
    "@material-ui/core": "^4"
  },
  "license": "MIT"
}

@Cretezy @BjoernRave If you have a way to apply the plugin only to Next.js client bundle builds, it should work. The server build doesn't bundle node_modules, so ES Modules usage is not allowed there. A quick Babel preset wrapper might do the trick (no guarantees):

// babel-preset-mui.js
module.exports = function(api) {
  const supportsStaticESM = api.caller(caller => !!caller.supportsStaticESM);
  return {
    plugins: [
      ["babel-plugin-transform-mui-imports", {
        esm: supportsStaticESM
      }]
    ]
  };
}

If anyone is importing alpha after updating to 4.12 here is an updated version:

// babel-plugin-transform-mui-imports.js
module.exports = function ({ types: t }) {
  return {
    name: "transform-mui-imports",
    visitor: {
      ImportDeclaration(path, state) {
        const source = path.node.source.value;
        if (!/(@material-ui\/(core|icons))$/.test(source)) return;
        path.replaceWithMultiple(path.get('specifiers').map(s => {
          let specificSource = source + (state.opts.esm===false ? '' : '/esm');
          let specifier = t.clone(s.node);
          // ignore wildcard and default imports that can't be exploded
          if (!t.isImportDefaultSpecifier(s) && !t.isImportNamespaceSpecifier(s)) {
            const name = s.node.imported.name;
            if (name === 'colors') {
              // import { colors } from '..' --> import * as colors from '/colors'
              specifier = t.importNamespaceSpecifier(specifier.local);
              specificSource += '/colors';
            }
            else if (/^(makeStyles|createStyles|createMuiTheme|responsiveFontSizes|styled|useTheme|withStyles|withTheme|createGenerateClassName|jssPreset|ServerStyleSheets|StylesProvider|MuiThemeProvider|ThemeProvider|easing|duration|hexToRgb|rgbToHex|hslToRgb|decomposeColor|recomposeColor|getContrastRatio|getLuminance|emphasize|fade|darken|lighten|alpha)$/.test(name)) {
              // core re-exports all of /styles
              // import { styled } from '..' --> import { styled } from '/styles'
              specifier = t.clone(s.node);
              specificSource += '/styles';
            }
            else {
              // import { List } from '..' --> import List from '/esm/List'
              specifier = t.importDefaultSpecifier(specifier.local);
              specificSource += '/' + name;
            }
          }
          return t.importDeclaration([specifier], t.stringLiteral(specificSource));
        }));
      }
    }
  };
}

I just added it to the repo and imported it in the babelrc.js:

// babelrc.js
const transformMuiImports = require('./babel-plugin-transform-mui-imports');

module.exports = { plugins: [transformMuiImports] };