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packages/main/index.js

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+import Main from './src/main';
+
+/* istanbul ignore next */
+Main.install = function(Vue) {
+  Vue.component(Main.name, Main);
+};
+
+export default Main;

packages/main/src/main.vue

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+<template>
+  <main class="el-main">
+    <slot></slot>
+  </main>
+</template>
+
+<script>
+  export default {
+    name: 'ElMain',
+    componentName: 'ElMain'
+  };
+</script>