feat: add root TypeScript support

app/angular/src/server/framework-preset-angular.ts

@@ -51,7 +51,6 @@ export function webpack(
     },
     resolve: {
       ...config.resolve,
-      extensions: ['.ts', '.tsx', ...config.resolve.extensions],
     },
     plugins: [
       ...config.plugins,

app/react/package.json

@@ -50,6 +50,7 @@
     "lodash": "^4.17.15",
     "prop-types": "^15.7.2",
     "react-dev-utils": "^10.0.0",
+    "react-docgen-typescript-loader": "^3.7.2",
     "regenerator-runtime": "^0.13.3",
     "semver": "^7.3.2",
     "ts-dedent": "^1.1.1",

app/react/src/server/framework-preset-react-docgen.test.ts

@@ -4,7 +4,7 @@ import * as preset from './framework-preset-react-docgen';
 describe('framework-preset-react-docgen', () => {
   const babelPluginReactDocgenPath = require.resolve('babel-plugin-react-docgen');
 
-  it('should return the config with the extra plugins when `plugins` is an array.', () => {
+  it('should return the config with the extra plugin', () => {
     const babelConfig = {
       babelrc: false,
       presets: ['env', 'foo-preset'],
@@ -15,62 +15,19 @@ describe('framework-preset-react-docgen', () => {
 
     expect(config).toEqual({
       babelrc: false,
-      plugins: [
-        'foo-plugin',
-        [
-          babelPluginReactDocgenPath,
-          {
-            DOC_GEN_COLLECTION_NAME: 'STORYBOOK_REACT_CLASSES',
-          },
-        ],
-      ],
-      presets: ['env', 'foo-preset'],
-    });
-  });
-
-  it('should return the config with the extra plugins when `plugins` is not an array.', () => {
-    const babelConfig: TransformOptions = {
-      babelrc: false,
-      presets: ['env', 'foo-preset'],
-      plugins: ['bar-plugin'],
-    };
-
-    const config = preset.babel(babelConfig);
-
-    expect(config).toEqual({
-      babelrc: false,
-      plugins: [
-        'bar-plugin',
-        [
-          babelPluginReactDocgenPath,
-          {
-            DOC_GEN_COLLECTION_NAME: 'STORYBOOK_REACT_CLASSES',
-          },
-        ],
-      ],
-      presets: ['env', 'foo-preset'],
-    });
-  });
-
-  it('should return the config only with the extra plugins when `plugins` is not present.', () => {
-    const babelConfig = {
-      babelrc: false,
+      plugins: ['foo-plugin'],
       presets: ['env', 'foo-preset'],
-    };
-
-    const config = preset.babel(babelConfig);
-
-    expect(config).toEqual({
-      babelrc: false,
-      plugins: [
-        [
-          babelPluginReactDocgenPath,
-          {
-            DOC_GEN_COLLECTION_NAME: 'STORYBOOK_REACT_CLASSES',
-          },
-        ],
+      overrides: [
+        {
+          test: /\.(mjs|jsx?)$/,
+          plugins: [
+            babelPluginReactDocgenPath,
+            {
+              DOC_GEN_COLLECTION_NAME: 'STORYBOOK_REACT_CLASSES',
+            },
+          ],
+        },
       ],
-      presets: ['env', 'foo-preset'],
     });
   });
 });

app/react/src/server/framework-preset-react-docgen.ts

@@ -1,22 +1,43 @@
 import { TransformOptions } from '@babel/core';
+import { Configuration } from 'webpack';
 
-export function babel(config: TransformOptions) {
-  // Ensure plugins are defined or fallback to an array to avoid empty values.
-  const babelConfigPlugins = config.plugins || [];
-
-  const extraPlugins = [
-    [
-      require.resolve('babel-plugin-react-docgen'),
+export function babel(
+  config: TransformOptions,
+  { typescript: { docgen = 'react-docgen-typescript' } } = { typescript: {} }
+) {
+  return {
+    ...config,
+    overrides: [
       {
-        DOC_GEN_COLLECTION_NAME: 'STORYBOOK_REACT_CLASSES',
+        test: docgen === 'react-docgen' ? /\.(mjs|tsx?|jsx?)$/ : /\.(mjs|jsx?)$/,
+        plugins: [
+          [
+            require.resolve('babel-plugin-react-docgen'),
+            {
+              DOC_GEN_COLLECTION_NAME: 'STORYBOOK_REACT_CLASSES',
+            },
+          ],
+        ],
       },
     ],
-  ];
+  };
+}
 
-  // If `babelConfigPlugins` is not an `Array`, calling `concat` will inject it
-  // as a single value, if it is an `Array` it will spread.
+export function webpackFinal(
+  config: Configuration,
+  { typescript: { docgen = 'react-docgen-typescript' } } = { typescript: {} }
+) {
+  if (docgen !== 'react-docgen-typescript') return config;
   return {
     ...config,
-    plugins: [].concat(babelConfigPlugins, extraPlugins),
+    module: {
+      ...config.module,
+      rules: [
+        ...config.module.rules,
+        {
+          loader: require.resolve('react-docgen-typescript-loader'),
+        },
+      ],
+    },
   };
 }

app/vue/package.json

@@ -57,6 +57,7 @@
     "css-loader": "*",
     "react": "*",
     "react-dom": "*",
+    "ts-loader": "^7.0.4",
     "vue": "^2.6.8",
     "vue-loader": "^15.7.0",
     "vue-template-compiler": "^2.6.8"

app/vue/src/server/framework-preset-vue.ts

@@ -14,6 +14,18 @@ export function webpack(config: Configuration) {
           loader: require.resolve('vue-loader'),
           options: {},
         },
+        {
+          test: /\.tsx?$/,
+          use: [
+            {
+              loader: require.resolve('ts-loader'),
+              options: {
+                transpileOnly: true,
+                appendTsSuffixTo: [/\.vue$/],
+              },
+            },
+          ],
+        },
       ],
     },
     resolve: {

examples/react-ts/README.md

@@ -0,0 +1,3 @@
+# Storybook TS example
+
+This Storybook demonstrates support for TypeScript in Storybook without additional configuration.

examples/react-ts/main.js

@@ -0,0 +1,7 @@
+module.exports = {
+  stories: ['./src/*.stories.*'],
+  typescript: {
+    check: true,
+    checkOptions: {},
+  },
+};

examples/react-ts/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "@storybook/example-react-ts",
+  "version": "6.0.0-beta.7",
+  "private": true,
+  "scripts": {
+    "build-storybook": "cross-env STORYBOOK_DISPLAY_WARNING=true DISPLAY_WARNING=true build-storybook -c ./",
+    "debug": "cross-env NODE_OPTIONS=--inspect-brk STORYBOOK_DISPLAY_WARNING=true DISPLAY_WARNING=true start-storybook -p 9011 -c ./ --no-dll",
+    "storybook": "cross-env STORYBOOK_DISPLAY_WARNING=true DISPLAY_WARNING=true start-storybook -p 9011 -c ./ --no-dll"
+  },
+  "dependencies": {
+    "@storybook/react": "6.0.0-beta.7",
+    "@types/react": "^16.9.35",
+    "@types/react-dom": "^16.9.8",
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1",
+    "typescript": "^3.9.2",
+    "webpack": "^4.43.0"
+  }
+}

examples/react-ts/src/button.stories.tsx

@@ -0,0 +1,6 @@
+import React from 'react';
+import { Button } from './button';
+
+export default { component: Button, title: 'Examples / Button' };
+
+export const SimpleButton = () => <Button label="Click me" />;

examples/react-ts/src/button.tsx

@@ -0,0 +1,7 @@
+import React, { FC, ButtonHTMLAttributes } from 'react';
+
+export interface ButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  label: string;
+}
+
+export const Button = ({ label }: ButtonProps) => <button type="button">{label}</button>;

examples/react-ts/tsconfig.json

@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "baseUrl": ".",
+    "skipLibCheck": true,
+    "jsx": "preserve",
+    "esModuleInterop": true,
+    "strict": true
+  },
+  "include": ["src/*"]
+}

lib/core/package.json

@@ -36,7 +36,7 @@
     "@babel/plugin-transform-react-constant-elements": "^7.2.0",
     "@babel/preset-env": "^7.9.6",
     "@babel/preset-react": "^7.8.3",
-    "@babel/preset-typescript": "^7.8.3",
+    "@babel/preset-typescript": "^7.9.0",
     "@babel/register": "^7.8.3",
     "@storybook/addons": "6.0.0-beta.7",
     "@storybook/api": "6.0.0-beta.7",
@@ -74,6 +74,7 @@
     "file-system-cache": "^1.0.5",
     "find-cache-dir": "^3.0.0",
     "find-up": "^4.1.0",
+    "fork-ts-checker-webpack-plugin": "^4.1.4",
     "fs-extra": "^9.0.0",
     "glob": "^7.1.6",
     "glob-base": "^0.3.0",

lib/core/src/server/common/babel.js

@@ -6,6 +6,7 @@ export default () => {
         require.resolve('@babel/preset-env'),
         { shippedProposals: true, useBuiltIns: 'usage', corejs: '3' },
       ],
+      require.resolve('@babel/preset-typescript'),
     ],
     plugins: [
       require.resolve('@babel/plugin-proposal-object-rest-spread'),

lib/core/src/server/config.js

@@ -1,12 +1,18 @@
+import { logger } from '@storybook/node-logger';
 import loadPresets from './presets';
 import loadCustomPresets from './common/custom-presets';
 
 async function getPreviewWebpackConfig(options, presets) {
   const babelOptions = await presets.apply('babel', {}, options);
   const entries = await presets.apply('entries', [], options);
   const stories = await presets.apply('stories', [], options);
+  const typescriptOptions = await presets.apply('typescript', {}, options);
 
-  return presets.apply('webpack', {}, { ...options, babelOptions, entries, stories });
+  return presets.apply(
+    'webpack',
+    {},
+    { ...options, babelOptions, entries, stories, typescriptOptions }
+  );
 }
 
 export default async (options) => {
@@ -20,7 +26,17 @@ export default async (options) => {
     ...overridePresets,
   ];
 
-  const presets = loadPresets(presetsConfig, restOptions);
+  // Remove `@storybook/preset-typescript` and add a warning if in use.
+  const filteredPresetConfig = presetsConfig.filter(
+    (preset) => !/@storybook[\\\\/]preset-typescript/.test(preset)
+  );
+  if (filteredPresetConfig.length < presetsConfig.length) {
+    logger.warn(
+      'Storybook now supports TypeScript natively. You can safely remove `@storybook/preset-typescript`.'
+    );
+  }
+
+  const presets = loadPresets(filteredPresetConfig, restOptions);
 
   return getPreviewWebpackConfig({ ...restOptions, presets }, presets);
 };

lib/core/src/server/config/useBaseTsSupport.js

@@ -0,0 +1,8 @@
+/**
+ * Returns true if the framework can use the base TS config.
+ * @param {string} framework
+ */
+export const useBaseTsSupport = (framework) => {
+  // These packages both have their own TS implementation.
+  return !['vue', 'angular'].includes(framework);
+};

lib/core/src/server/manager/babel-loader-manager.js

@@ -12,7 +12,6 @@ export default () => ({
             require.resolve('@babel/preset-env'),
             { shippedProposals: true, useBuiltIns: 'usage', corejs: '3' },
           ],
-          require.resolve('@babel/preset-typescript'),
           require.resolve('@babel/preset-react'),
         ],
         plugins: [

lib/core/src/server/preview/babel-loader-preview.js

@@ -1,7 +1,8 @@
 import { includePaths, excludePaths } from '../config/utils';
+import { useBaseTsSupport } from '../config/useBaseTsSupport';
 
-export default (options) => ({
-  test: /\.(mjs|jsx?)$/,
+export default (options, framework) => ({
+  test: useBaseTsSupport(framework) ? /\.(mjs|tsx?|jsx?)$/ : /\.(mjs|jsx?)$/,
   use: [
     {
       loader: 'babel-loader',

lib/core/src/server/preview/iframe-webpack.config.js

@@ -8,6 +8,7 @@ import WatchMissingNodeModulesPlugin from 'react-dev-utils/WatchMissingNodeModul
 import TerserWebpackPlugin from 'terser-webpack-plugin';
 import VirtualModulePlugin from 'webpack-virtual-modules';
 import PnpWebpackPlugin from 'pnp-webpack-plugin';
+import ForkTsCheckerWebpackPlugin from 'fork-ts-checker-webpack-plugin';
 
 import resolveFrom from 'resolve-from';
 
@@ -16,6 +17,7 @@ import createBabelLoader from './babel-loader-preview';
 import { nodeModulesPaths, loadEnv } from '../config/utils';
 import { getPreviewHeadHtml, getPreviewBodyHtml } from '../utils/template';
 import { toRequireContextString } from './to-require-context';
+import { useBaseTsSupport } from '../config/useBaseTsSupport';
 
 const reactPaths = {};
 try {
@@ -36,10 +38,11 @@ export default async ({
   configType,
   framework,
   presets,
+  typescriptOptions,
 }) => {
   const dlls = await presets.apply('webpackDlls', []);
   const { raw, stringified } = loadEnv({ production: true });
-  const babelLoader = createBabelLoader(babelOptions);
+  const babelLoader = createBabelLoader(babelOptions, framework);
   const isProd = configType === 'PRODUCTION';
   const entryTemplate = await fse.readFile(path.join(__dirname, 'virtualModuleEntry.template.js'), {
     encoding: 'utf8',
@@ -81,6 +84,9 @@ export default async ({
       .replace("'{{stories}}'", stories.map(toRequireContextString).join(','));
   }
 
+  const shouldCheckTs = useBaseTsSupport(framework) && typescriptOptions.check;
+  const tsCheckOptions = typescriptOptions.checkOptions || {};
+
   return {
     mode: isProd ? 'production' : 'development',
     bail: isProd,
@@ -129,6 +135,7 @@ export default async ({
       new CaseSensitivePathsPlugin(),
       quiet ? null : new ProgressPlugin(),
       new Dotenv({ silent: true }),
+      shouldCheckTs ? new ForkTsCheckerWebpackPlugin(tsCheckOptions) : null,
     ].filter(Boolean),
     module: {
       rules: [
@@ -144,7 +151,7 @@ export default async ({
       ],
     },
     resolve: {
-      extensions: ['.mjs', '.js', '.jsx', '.json', '.cjs'],
+      extensions: ['.mjs', '.js', '.jsx', '.ts', '.tsx', '.json', '.cjs'],
       modules: ['node_modules'].concat(raw.NODE_PATH || []),
       alias: {
         'babel-runtime/core-js/object/assign': require.resolve('core-js/es/object/assign'),