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I'm seeing this in particular when using the jQuery-1.4.3 externs file. The javadocs for that reads /** * @param {(string|number|function(number,number))=} arg1 * @return {(number|jQueryObject)} * @nosideeffects */ jQueryObject.prototype.width = function(arg1) {}; I have a call that looks like this: var w = $(window).width(); $('#whatever').width(w) Closure complains: WARNING - actual parameter 1 of jQueryObject.prototype.height does not match formal parameter found : (jQueryObject|null|number) required: (function (number, number): ?|number|string|undefined) $('#Xobni').height($(window).height()); From playing around (removing the possible return types), I can see that the problem is that the first call to width can return possibly a jQueryObject, and since that's not a valid input, Closure gives me an error. I tried adding this: /** * @type {number} */ var w = $(window).width(); $('#Xobni').width(w); But then Closure complains: WARNING - initializing variable found : (jQueryObject|null|number) required: number var w = $(window).width(); The problem is that when width takes an argument, it returns a jQueryObject. When it doesn't take an argument, it returns a number. So I know my call is okay, but the javadocs don't quite reflect that, and so Closure is warning me. Is there a way to fix up the javadocs appropriately or a way to tell Closure I know this result will be a number. I know I can probably suppress the error, but I'd like to know how to annotate these things better. Thanks for the help!

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