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Editorial Team
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Asked: 2026-05-24T16:04:48+00:00

The coffeescript compiler is, for some reason, wrapping all of my .coffee files in

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The coffeescript compiler is, for some reason, wrapping all of my .coffee files in a function when they are compiled. For example, if I have test.coffee:

class TestClass
    constructor: (@value) ->

    printValue: () ->
        alert(@value)

printAValue = () -> 
    test = new TestClass()
    test.printValue()

then I get test.js:

(function() {
  var TestClass, printAValue;
  TestClass = (function() {
    function TestClass(value) {
      this.value = value;
    }
    TestClass.prototype.printValue = function() {
      return alert(this.value);
    };
    return TestClass;
  })();
  printAValue = function() {
    var test;
    test = new TestClass();
    return test.printValue();
  };
}).call(this);

My simple html file won’t work with this:

<html>
    <head>
        <script src="test.js"></script>
    </head>
    <body onload="printAValue()">
    </body>
</html>

I haven’t worked with much JS before, and I wouldn’t doubt the coffee compiler, but is the way it should work? How

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1 Answer

  1. Editorial Team

    Never add event listeners in HTML. Add them in your JavaScript, preferably in the same scope in which you define the event handler.

    printAValue = () -> 
    test = new TestClass()
    test.printValue()

document.body.addEventListener('load', printAValue, false)

    If you absolutely need to export something to the global scope, export to the window object:

    window.printAValue = () -> 
    test = new TestClass()
    test.printValue()
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