流星自定义包中的 CoffeeScript 命名空间导出 [英] CoffeeScript namespace exports in Meteor custom packages

问题描述

有几个小时，我无法让我的 Meteor 包导出在 CoffeeScript 文件中定义的变量.

For a few hours, I couldn't get my Meteor package to export variables defined in CoffeeScript files.

在 foo.coffee 中，例如，我尝试使用 @Foo = {foo: 1}, Foo = {foo: 1}、exports.Foo = {foo: 1} 等等，但 nothing 会起作用.

In foo.coffee, for example, I tried using @Foo = {foo: 1}, Foo = {foo: 1}, exports.Foo = {foo: 1}, and so on and so forth, but nothing would work.

最后，看了 Meteor coffeescriptgithub上的测试包，我放置了 api.export(); 调用 before api.on_use() 调用包它工作了.

Finally, after looking at the Meteor coffeescript test package on github, I placed the api.export(); call before the api.on_use() call for that package and it worked.

我的包设置如下:

foo/
    .meteor/
    .build/
    foo.coffee
    package.js

foo.coffee

class FooBar
  constructor: ->

Foo =
  FooBar: FooBar

package.js

Package.describe({
    summary: "A package that makes foo with foobar"
});

Package.on_use(function(api) {
    api.use("coffeescript", "client");
    api.export("Foo", "client"); // <-- Moved this to *before* the on_use declaration

    api.add_files("foo.coffee", "client");

});

推荐答案

Coffeescript 编译

Coffeescript compiles

@Foo =
  FooBar: FooBar

到

(function() {
  this.Foo = { 
    FooBar: FooBar
  };  
}).call(this);

你需要去掉Foo之前的this.，看看命名空间，但这不是一个好主意，因为您可能需要在修改原始咖啡文件后对其进行编译.

You need to remove the this. before Foo, take a look at namespace, but it's not a good idea since you might need to compile it once you modify the original coffee files.

这是我的诀窍:

添加一个名为 global_variables.js 的文件:

Add a file, named global_variables.js:

Foo = this.Foo;

然后将它添加到你的 package.js 中:

Then add it in your package.js:

api.add_files('xxx', 'xxx', 'global_variables.js');

然后它就可以工作了！

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