test(preserve-modules)

examples/preserve-modules/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "preserve-modules",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "build": "rollup -c"
+  },
+  "dependencies": {
+    "rollup": "^2.10.9",
+    "rollup-plugin-vue": "link:../.."
+  }
+}

examples/preserve-modules/rollup.config.js

@@ -0,0 +1,15 @@
+import VuePlugin from 'rollup-plugin-vue'
+
+export default [
+  {
+    input: 'src/HelloWorld.vue',
+    output: {
+      file: 'dist/HelloWorld.js',
+      format: 'esm',
+      sourcemap: 'inline',
+      preserveModules: true,
+    },
+    plugins: [VuePlugin()],
+    external: ['vue'],
+  },
+]

examples/preserve-modules/src/App.vue

@@ -0,0 +1,14 @@
+<template>
+  <hello-world name="World" />
+</template>
+
+<script>
+import HelloWorld from './HelloWorld.vue'
+
+export default {
+  name: 'App',
+  components: {
+    HelloWorld
+  }
+}
+</script>

examples/preserve-modules/src/HelloWorld.vue

@@ -0,0 +1,9 @@
+<script>
+export default {
+  props: ['name'],
+}
+</script>
+
+<template>
+  <div>Hello {{ name }}!</div>
+</template>

test/core.e2e.ts

@@ -92,6 +92,18 @@ describe('typescript', () => {
   })
 })
 
+describe('preserve modules', () => {
+  let result!: RollupOutput
+
+  beforeAll(async () => {
+    result = await roll('preserve-modules')
+  })
+
+  it('should have modules', () => {
+    expect(Object.keys(result.output[0].modules).length).not.toEqual(0)
+  })
+})
+
 import Path from 'path'
 async function roll(name: string) {
   const configFile = `../examples/${name}/rollup.config.js`