text: define(["require", "exports"], function (require, exports) {
      "use strict";
      Object.defineProperty(exports, "__esModule", { value: true });
      function digits() {
          return {
              validate: function (input) {
                  return { valid: (input.value === '') || /^\d+$/.test(input.value) };
              },
          };
      }
      exports.default = digits;
  });
  