build!: drop IE11 support

README.md

@@ -140,7 +140,6 @@ Creates a [React Styleguidist configuration object](https://react-styleguidist.j
 -   `options.packageSection [boolean]` - Include `package.json` details as a top level section (default: `true`)
 -   `options.packageSectionComponents [boolean]` - Include `components` configuration in the top-level package section (default: `false`)
 -   `options.componentsSection [boolean]` - Include `components` configuration as its own separate section (default: `true`)
--   `options.ie11Transforms [array]` - An array of additional modules that need babel transforms for IE11 compatibility ([#1327](https://github.com/styleguidist/react-styleguidist/pull/1327))
 
 ## Linking Styleguides
 

lib/configs/__tests__/createStyleguideConfig.test.js

@@ -95,29 +95,6 @@ describe('webpackConfig.resolve.alias', () => {
     });
 });
 
-describe('IE 11 support for styleguidist artifacts', () => {
-    it('is configured at root level', () => {
-        const { webpackConfig } = createStyleguideConfig();
-        expect(webpackConfig.module.rules[1]).toHaveProperty('use.options.presets', [
-            [
-                '@babel/preset-env',
-                {
-                    modules: 'commonjs',
-                    targets: {
-                        ie: '11',
-                    },
-                },
-            ],
-        ]);
-    });
-
-    it('is not configured in nested executions', () => {
-        process.env.creatingStyleguideConfig = __dirname;
-        const { webpackConfig } = createStyleguideConfig();
-        expect(webpackConfig.module.rules).toHaveLength(1);
-    });
-});
-
 describe('circular-dependency-plugin', () => {
     it('is configured at root level', () => {
         const { webpackConfig } = createStyleguideConfig();

lib/configs/createStyleguideConfig.js

@@ -189,42 +189,6 @@ module.exports = (config = {}, options = {}) => {
 
     // only the root should alias singletons or check circularity
     if (isRootConfig()) {
-        // IE 11 support for styleguidist-generated artifacts
-        // https://github.com/styleguidist/react-styleguidist/pull/1327#issuecomment-483928457
-        const ie11ModuleTransforms = [
-            'acorn-jsx',
-            'estree-walker',
-            'regexpu-core',
-            'unicode-match-property-ecmascript',
-            'unicode-match-property-value-ecmascript',
-            'react-dev-utils',
-            'ansi-styles',
-            'ansi-regex',
-            'chalk',
-            'strip-ansi',
-            ...(options.ie11ModuleTransforms || []),
-        ];
-        webpackConfig.module.rules.push({
-            test: /\.jsx?$/,
-            include: new RegExp(`node_modules/(?=(${ie11ModuleTransforms.join('|')})/).*`),
-            use: {
-                loader: 'babel-loader',
-                options: {
-                    presets: [
-                        [
-                            '@babel/preset-env',
-                            {
-                                modules: 'commonjs',
-                                targets: {
-                                    ie: '11',
-                                },
-                            },
-                        ],
-                    ],
-                },
-            },
-        });
-
         webpackConfig.resolve = {
             alias: ['react', 'react-dom', 'styled-components'].reduce((acc, name) => {
                 // resolvePkg does not throw if it cannot resolve, merely returns undefined