markdown-it-synapse-math/lib/polyfills.js

Markdown-it plugin to include math in your document

'use strict';

/* Object.assign
 *
 * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/
 * Global_Objects/Object/assign
 *
 * This polyfill doesn't support symbol properties, since ES5 doesn't
 * have symbols anyway:
 */

if (!Object.assign) {
  Object.defineProperty(Object, 'assign', {
    enumerable: false,
    configurable: true,
    writable: true,
    value: function(target) {
      if (typeof target === 'undefined' || target === null) {
        throw new TypeError('Cannot convert first argument to object');
      }

      var to = Object(target);
      for (var i = 1; i < arguments.length; i++) {
        var nextSource = arguments[i];
        if (typeof nextSource === 'undefined' || nextSource === null) {
          continue;
        }

        var keysArray = Object.keys(Object(nextSource));
        for (var nextIndex = 0, len = keysArray.length; nextIndex < len; nextIndex++) {
          var nextKey = keysArray[nextIndex];
          var desc = Object.getOwnPropertyDescriptor(nextSource, nextKey);
          if (typeof desc !== 'undefined' && desc.enumerable) {
            to[nextKey] = nextSource[nextKey];
          }
        }
      }
      return to;
    }
  });
}