解决ionic4联系人Contacts出现Module parse failed: Identifier 'checkAvailability' has already been declared

当我们在ionic4上使用原生api联系人Contacts时候会出现下面的错误提示：

ERROR in ./node_modules/@ionic-native/contacts/ngx/index.js 20:126
[ng] Module parse failed: Identifier 'checkAvailability' has already been declared (20:126)
[ng] You may need an appropriate loader to handle this file type.
[ng] |     return c > 3 && r && Object.defineProperty(target, key, r), r;
[ng] | };
[ng] > import { IonicNativePlugin,cordovaInstance,checkAvailability, instanceAvailability, instancePropertyGet, instancePropertySet, checkAvailability, getPromise } from '@ionic-native/core';
[ng] | var Contact = /** @class */ (function () {
[ng] |     function Contact() {

原因是：重复导入了 checkAvailability

解决方案：

打开文件   node_modules\@ionic-native\contacts\ngx\index.js

找到 

import { IonicNativePlugin,cordovaInstance,checkAvailability, instanceAvailability, instancePropertyGet, instancePropertySet, checkAvailability, getPromise } from '@ionic-native/core';

会发现里面有两个checkAvailability，删除一个即可。

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