ES6 - 带吸气剂的出口模块 [英] ES6 - Exporting module with a getter

问题描述

这是一个类似于：

  export {
 get DynamicModule（）{
 return __globalFluxStorage.state.property.property.property.property 
} 
} 
 
 ... 
 
从动态模块导入{DynamicModule} 
  

我们有一个复杂的通量存储，而DynamicModule只是访问__globalFluxStorage.state.property.property.property.property的一种方式，而不需要键入long属性访问器。这可能吗？谢谢。

编辑：

由于我使用的是babel，尝试了这样一个：

  Object.defineProperty（module.exports，Forms，{
 get：function（）{
 return __globalFluxStorage.state .property.property.property.property 
} 
}）; 
  

但不起作用，即{DynamicModule}是 undefined

解决方案

不，不可能为模块导出创建一个getter - 它们是可变绑定，而不是属性。

但是，您可以简单地将其设为默认导出：

  export默认__globalFluxStorage.state.property.property.property.property; 
  

 从'dynamic-module'导入DynamicModule; 
  

如果你想要一个命名导入，你必须在导出中声明名称： p>

  export var DynamicModule = __globalFluxStorage.state.property.property.property.property; 
  

  import {DynamicModule} from'dynamic-module'; 
  

这也允许稍后在加载模块时不可用的值更改：

  export var DynamicModule; 
 ... 
 DynamicModule = __globalFluxStorage.state.property.property.property.property; 
  

（尽管在这种情况下，您可能需要考虑导出Promise或EventEmitter）

would like to export a module that get's the module's definition from some global object.

It's something like:

export {
  get DynamicModule() {
    return __globalFluxStorage.state.property.property.property.property
  }
}

...

import {DynamicModule} from 'dynamic-module'

We have a complex flux storage and DynamicModule is just a means of accessing __globalFluxStorage.state.property.property.property.property without the need to type in the long property accessor. Is this possible? Thanks.

Edit:

Since I am using babel, tried something like this:

Object.defineProperty(module.exports, "Forms", {
  get: function() {
    return __globalFluxStorage.state.property.property.property.property
  }
});

But does not work, i.e. {DynamicModule} is undefined

解决方案

No, it is impossible to make a getter for a module export - they are variable bindings, not properties.

However you could simply make that a default export:

export default __globalFluxStorage.state.property.property.property.property;

import DynamicModule from 'dynamic-module';

If you want a named import, you'll have to declare the name in your export:

export var DynamicModule = __globalFluxStorage.state.property.property.property.property;

import {DynamicModule} from 'dynamic-module';

This would also allow changing the value later when it's not available right at the time of the module being loaded:

export var DynamicModule;
…
DynamicModule = __globalFluxStorage.state.property.property.property.property;

(although in that case you might want to consider exporting a Promise or EventEmitter instead)

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