node_modules/parse5/lib/utils/merge-options.js

'use strict';

module.exports = function mergeOptions(defaults, options) {
    options = options || Object.create(null);

    return [defaults, options].reduce((merged, optObj) => {
        Object.keys(optObj).forEach(key => {
            merged[key] = optObj[key];
        });

        return merged;
    }, Object.create(null));
};