feat: 增加js demo

packages/playground/README.md

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+# `playground`
+
+`demo`工厂

packages/playground/js/package.json

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+{
+  "name": "playground-js",
+  "version": "10.0.0",
+  "description": "",
+  "scripts": {
+    "build": "npx xus lib-build"
+  },
+  "license": "MIT"
+}

packages/playground/js/src/di.js

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+export const dires = 23

packages/playground/js/src/index.js

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+// es6+
+export const trim = '   123'.trimStart()
+export const arrFalt = [['1', '2'], 3].falt()
+
+// dynamic import
+export const di = async () => {
+  await Promise.resolve(3)
+  await import('./di')
+}

packages/playground/js/xus.config.ts

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+import { defineConfig } from '@xus/cli'
+
+export default defineConfig({
+  libBuild: {
+    target: ['es2015'],
+    formats: ['esm', 'cjs'],
+    sourcemap: false,
+    minify: false
+  }
+})

packages/playground/package.json

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+{
+  "private": true,
+  "description": "xus cli playground",
+  "author": "guo.xu <xuguo@outlook.it>",
+  "homepage": "https://github.com/xus-code/bundle-tools/tree/master/packages/cli#readme",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/xus-code/bundle-tools.git"
+  },
+  "dependencies": {
+    "@xus/cli": "^0.2.0",
+    "@xus/plugin-lib-legacy": "^0.2.0",
+    "@xus/plugin-lib-vue-jsx": "^0.2.0"
+  }
+}

packages/playground/tsconfig.json

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+{
+  "compilerOptions": {
+    "outDir": "./dist"
+  },
+  "extends": "../../tsconfig.json",
+  "include": ["./src/**/*"],
+  "exclude": ["./src/js/**/*"]
+}