feat(plugin-uglifyjs): added uglifyjs plugin

packages/plugin-uglifyjs/.npmignore

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+node_modules

packages/plugin-uglifyjs/README.md

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+# wepy uglifyjs 插件
+
+## 安装
+
+```bash
+npm install @wepy/plugin-uglifyjs uglify-js --save-dev
+```
+
+## 配置`wepy.config.js`
+
+```javascript
+const PluginUglifyjs = require('@wepy/plugin-uglifyjs');
+
+module.exports = {
+  plugins: [
+    PluginUglifyjs({
+    // options
+    })
+  ]
+};
+```
+
+## 参数说明
+
+你提供的配置选项 ```options``` 将传递给 ```UglifyJS```处理，有关 ```options``` 的更多详细信息，请参阅[UglifyJS文档](https://github.com/mishoo/UglifyJS2#minify-options)。
+
+

packages/plugin-uglifyjs/index.js

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+/**
+ * Tencent is pleased to support the open source community by making WePY available.
+ * Copyright (C) 2017 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the MIT License (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
+ * http://opensource.org/licenses/MIT
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
+ */
+
+const UglifyJS = require('uglify-js');
+
+exports = module.exports = function (options = {}) {
+  return function () {
+    this.register('output-file', function ({ filename, code, encoding }) {
+
+      let ext = path.extname(filename);
+      if (ext !== '.js') {
+        return { filename, code, encoding };
+      }
+
+      let result = UglifyJS.minify({ [filename]: code }, options);
+
+      if (result.error) {
+        let pos = {
+          line: result.error.line,
+          column: result.error.col
+        };
+        throw {
+          handler: 'script',
+          error: {
+            filename: result.error.filename,
+            code: code,
+            type: 'error',
+            message: result.error.message,
+            title: 'uglifyjs'
+          },
+          pos: {
+            start: pos,
+            end: pos
+          }
+        };
+      }
+    });
+  }
+};

packages/plugin-uglifyjs/package.json

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+{
+  "name": "@wepy/plugin-uglifyjs",
+  "version": "0.0.1",
+  "description": "wepy uglifyjs",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "wepy",
+    "uglifyjs"
+  ],
+  "author": "Gcaufy",
+  "license": "MIT",
+  "peerDependencies": {
+    "uglify-js": "^3.4.9"
+  },
+  "dependencies": {
+  }
+}

packages/plugin-uglifyjs/test/index.test.js

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+// Todo