init

.gitignore

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+node_modules
+*.log
+dist

README.md

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+# tsup
+
+A bundler focusing on TypeScript experience, based on Rollup.
+
+## Install
+
+Install it locally in your project folder:
+
+```bash
+npm i tsup -D
+# Or Yarn
+yarn add tsup --dev
+```
+
+You can also install it globally but it's not recommended.
+
+## License
+
+MIT.

package.json

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+{
+  "name": "tsup",
+  "version": "1.0.0",
+  "main": "index.js",
+  "author": "EGOIST",
+  "license": "MIT",
+  "devDependencies": {
+    "@types/node": "^13.9.2",
+    "cac": "^6.5.7",
+    "rollup": "^2.1.0",
+    "rollup-plugin-typescript2": "^0.26.0",
+    "ts-node": "^8.7.0"
+  },
+  "dependencies": {
+    "@babel/core": "^7.8.7",
+    "@babel/preset-env": "^7.8.7",
+    "@babel/preset-typescript": "^7.8.3",
+    "rollup-plugin-babel": "^4.4.0",
+    "rollup-plugin-hashbang": "^2.2.2",
+    "typescript": "^3.8.3"
+  }
+}

src/cli.ts

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+#!/usr/bin/env node
+import { readFileSync } from 'fs'
+import {join} from 'path'
+import { cac } from 'cac'
+
+const cli = cac('tsup')
+
+cli.command('[file]', 'Bundle a speific file')
+.option('--format <format>', 'Bundle format')
+  .action(async (file: string, options) => {
+    const {rollup} = await import('rollup')
+
+    return rollup({
+      input: file,
+      plugins: [
+        require('rollup-plugin-hashbang')(),
+        require('rollup-plugin-babel')({
+          extensions: ['.js', '.jsx', '.ts', '.tsx'],
+          presets: [
+            [require.resolve('@babel/preset-env'), {
+              modules: false
+            }],
+            require.resolve('@babel/preset-typescript')
+          ]
+        })
+      ]
+    }).then(result => {
+      result.write({
+        dir: 'dist',
+        format: options.format || 'cjs'
+      })
+    })
+  })
+
+cli.help()
+
+const pkgPath = join(__dirname, '../package.json')
+cli.version(JSON.parse(readFileSync(pkgPath, 'utf8')).version)
+
+cli.parse()