code: function map(project, thisArg) {
      return function mapOperation(source) {
          if (typeof project !== 'function') {
              throw new TypeError('argument is not a function. Are you looking for `mapTo()`?');
          }
          return source.lift(new MapOperator(project, thisArg));
      };
  }
docs: PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END