test: add cases

playground/concatenate-modules/README.md

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+# concatenate modules
+
+The scope of all modules should be concatenated into one closure.

playground/concatenate-modules/constants.js

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+export default num = 0
+export const num1 = 1
+export const num2 = 2

playground/concatenate-modules/index.js

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+export * from './lib'
+export { num } from './constants'

playground/concatenate-modules/lib.js

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+import num, { num1, num2 } from './constants'
+
+export function add1() {
+  return num + num1
+}
+
+export function add2() {
+  return num + num2
+}
+
+export { num1 }

playground/css/button.css

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+.button {
+  background-color: azure;
+}

playground/css/button.js

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+import './button.css'
+
+export const renderButton = () => {
+  const button = document.createElement('button')
+  button.className = 'button theme-button'
+  return button
+}

playground/css/css/theme.css

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+.theme-button {
+  padding: 1rem;
+}

playground/css/index.js

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+import foo from './foo'
+export default foo

playground/css/less/index.less

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+@width: 10px;
+@height: @width + 10px;
+
+.button {
+  width: @width;
+  height: @height;
+}

playground/css/package.json

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+{
+  "name": "@rslib/test-css",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "devDependencies": {
+    "less": "^4.2.0",
+    "sass": "^1.72.0"
+  }
+}

playground/css/sass/index.scss

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+$font-stack: Helvetica, sans-serif;
+$primary-color: #333;
+
+.button {
+  font: 100% $font-stack;
+  color: $primary-color;
+}

playground/esm/foo.js

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+export default 'foo'

playground/esm/index.js

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+import foo from './foo'
+export { foo }

playground/external/README.md

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+# external
+
+`react` should not be bundled.

playground/external/index.jsx

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+import React from 'react'
+
+const Button = ({ children }) => {
+  return <button>{children}</button>
+}
+
+export default Button

playground/ts-with-ts-extension/foo.ts

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+export default 'foo'

playground/ts-with-ts-extension/index.ts

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+import foo from './foo.ts'
+export { foo }

playground/ts/foo.ts

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+export default 'foo'

playground/ts/index.ts

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+import foo from './foo'
+export { foo }