gistfile1.js

// ==ClosureCompiler==
// @compilation_level ADVANCED_OPTIMIZATIONS
// @use_closure_library true
// ==/ClosureCompiler==

/**
* @define {boolean}
*/
ol.API = true;

/**
* @param {Object} opt_arg
* @constructor
* @notypecheck
*/
ol.map = function(opt_arg) {
var param = ol.API ? opt_arg['param'] : opt_arg.param;
window.console.log(param);
}

var map = new ol.map({param:'asdfasdf'});