Add initial tsup config

Author: markerikson

tsup.config.ts

@@ -0,0 +1,100 @@
+import { defineConfig, Options } from 'tsup'
+
+import path from 'path'
+import fs from 'fs'
+
+function writeCommonJSEntry() {
+  fs.writeFileSync(
+    path.join('dist/cjs/', 'index.js'),
+    `'use strict'
+if (process.env.NODE_ENV === 'production') {
+  module.exports = require('./react-redux.production.min.cjs')
+} else {
+  module.exports = require('./react-redux.development.cjs')
+}`
+  )
+}
+
+export default defineConfig((options) => {
+  const commonOptions: Partial<Options> = {
+    entry: {
+      'react-redux': 'src/index.ts',
+    },
+    sourcemap: true,
+    target: 'es2020',
+    ...options,
+  }
+
+  return [
+    // Standard ESM, embedded `process.env.NODE_ENV` checks
+    {
+      ...commonOptions,
+      format: ['esm'],
+      outExtension: () => ({ js: '.mjs' }),
+      dts: true,
+      clean: true,
+    },
+    // Support Webpack 4 by pointing `"module"` to a file with a `.js` extension
+    {
+      ...commonOptions,
+      entry: {
+        'react-redux.legacy-esm': 'src/index.ts',
+      },
+      target: 'es2017',
+      format: ['esm'],
+      outExtension: () => ({ js: '.js' }),
+    },
+    // Browser-ready ESM, production + minified
+    {
+      ...commonOptions,
+      entry: {
+        'react-redux.browser': 'src/index.ts',
+      },
+      define: {
+        'process.env.NODE_ENV': JSON.stringify('production'),
+      },
+      format: ['esm'],
+      outExtension: () => ({ js: '.mjs' }),
+      minify: true,
+    },
+    // "Alternate renderers" entry point with a no-op batch
+    {
+      ...commonOptions,
+      entry: {
+        'react-redux.alternate-renderers': 'src/alternate-renderers.ts',
+      },
+      format: ['esm'],
+      outExtension: () => ({ js: '.mjs' }),
+    },
+    // CJS development
+    {
+      ...commonOptions,
+      entry: {
+        'react-redux.development': 'src/index.ts',
+      },
+      define: {
+        'process.env.NODE_ENV': JSON.stringify('development'),
+      },
+      format: 'cjs',
+      outDir: './dist/cjs/',
+      outExtension: () => ({ js: '.cjs' }),
+    },
+    // CJS production
+    {
+      ...commonOptions,
+      entry: {
+        'react-redux.production.min': 'src/index.ts',
+      },
+      define: {
+        'process.env.NODE_ENV': JSON.stringify('production'),
+      },
+      format: 'cjs',
+      outDir: './dist/cjs/',
+      outExtension: () => ({ js: '.cjs' }),
+      minify: true,
+      onSuccess: () => {
+        writeCommonJSEntry()
+      },
+    },
+  ]
+})