我应该使用什么语法来声明闭包编译器的外部变量? [英] What syntax I should use to declare externs for closure compiler?

问题描述

我想为闭包编译器声明一些extern，但不知道该怎么做?

I want to declare some externs for closure compiler but not know how to do it?

(function(window) {
window.myapi = window.myapi || {};

var myapi = window.myapi;

myapi.hello = function() {
  window.document.write('Hello');
}
}(window));

我不确定如何对window.myapi，window.myapi.hello做到这一点?

I am not sure how to do it for window.myapi, window.myapi.hello?

推荐答案

外部内容是有效的JavaScript，但它们只是类型信息.它们不应包含定义(或对于函数，只能包含空定义).

Externs are valid javascript, but they are just type information. They should not contain definitions (or for functions only empty definitions).

这是一个开始:关于您的特定示例的几点说明:

A couple of notes on your specific example:

1. 请勿使用匿名包装.类型名称必须是全局名称.
2. 窗口对象的属性与名称空间示例相同.
3. 函数不应具有实现

这是一个更正的示例:

/** @const */
window.myapi = {};

/** @return {undefined} */
window.myapi.hello = function() {};

在window(全局)对象的Closure-compiler属性中，所看到的与全局变量完全不同.如果两者都需要，则必须两次声明所有内容.

In Closure-compiler properties on the window (global) object are seen completely differently than global variables. If you need both, you'll have to declare everything twice.

/** @const */
var myapi = {};

/** @return {undefined} */
myapi.hello = function() {};

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