Can't read property bool of undefined in bundled server.js

[tyagivipul629]

I'm getting this error after bundling the server and then running it.
`/home/vipul/Documents/first-app/dist/server.js:1
(function (exports, require, module, __filename, __dirname) { module.exports=function(e){var t={};function n(r){if(t[r])return t[r].exports;var o=t[r]={i:r,l:!1,exports:{}};return e[r].call(o.exports,o,o.exports,n),o.l=!0,o.exports}return n.m=e,n.c=t,n.d=function(e,t,r){n.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:r})},n.r=function(e){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},n.t=function(e,t){if(1&t&&(e=n(e)),8&t)return e;if(4&t&&"object"==typeof e&&e&&e.__esModule)return e;var r=Object.create(null);if(n.r(r),Object.defineProperty(r,"default",{enumerable:!0,value:e}),2&t&&"string"!=typeof e)for(var o in e)n.d(r,o,function(t){return e[t]}.bind(null,o));return r},n.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return n.d(t,"a",t),t},n.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,

TypeError: Cannot read property 'bool' of undefined
at Module. (/home/vipul/Documents/first-app/dist/server.js:1:3442)
at n (/home/vipul/Documents/first-app/dist/server.js:1:186)
at Module. (/home/vipul/Documents/first-app/dist/server.js:1:1245)
at n (/home/vipul/Documents/first-app/dist/server.js:1:186)
at /home/vipul/Documents/first-app/dist/server.js:1:986
at Object. (/home/vipul/Documents/first-app/dist/server.js:1:995)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)
at tryModuleLoad (module.js:505:12)
`