CityBEM-CityLayers-SaeedRay.../node_modules/defaults/index.js

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var clone = require('clone');
module.exports = function(options, defaults) {
options = options || {};
Object.keys(defaults).forEach(function(key) {
if (typeof options[key] === 'undefined') {
options[key] = clone(defaults[key]);
}
});
return options;
};