Function parseKeyValue

packages/common/upgrade/src/params.ts:260–285

* Parses an escaped url query string into key-value pairs. Logic taken from * https://github.com/angular/angular.js/blob/864c7f0/src/Angular.js#L1382

(keyValue: string)

 * https://github.com/angular/angular.js/blob/864c7f0/src/Angular.js#L1382
 */
function parseKeyValue(keyValue: string): {[k: string]: unknown} {
  const obj: {[k: string]: unknown} = {};
  (keyValue || '').split('&').forEach((keyValue) => {
    let splitPoint, key, val;
    if (keyValue) {
      key = keyValue = keyValue.replace(/\+/g, '%20');
      splitPoint = keyValue.indexOf('=');
      if (splitPoint !== -1) {
        key = keyValue.substring(0, splitPoint);
        val = keyValue.substring(splitPoint + 1);
      }
      key = tryDecodeURIComponent(key);
      if (typeof key !== 'undefined') {
        val = typeof val !== 'undefined' ? tryDecodeURIComponent(val) : true;
        if (!obj.hasOwnProperty(key)) {
          obj[key] = val;
        } else if (Array.isArray(obj[key])) {
          (obj[key] as unknown[]).push(val);
        } else {
          obj[key] = [obj[key], val];
        }
      }
    }
  });
  return obj;
}

/**
 * Serializes into key-value pairs. Logic taken from