WebSocketServer throwing UnhandledPromiseRejectionWarning

[Anonymous]

Hi All,

I am building  a new Custom Visual for Google maps integrated with the api key.

but I am getting compilation error as

(node:2784) UnhandledPromiseRejectionWarning: C:\Users\shashekh\AppData\Roaming\npm\node_modules\powerbi-visuals-tools\node_modules\webpack-dev-server\lib\servers\WebsocketServer.js:10
  static heartbeatInterval = 1000;
                           ^

SyntaxError: Unexpected token =
    at new Script (vm.js:80:7)
    at createScript (vm.js:274:10)
    at Object.runInThisContext (vm.js:326:10)
    at Module._compile (internal/modules/cjs/loader.js:664:28)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)
    at Module.load (internal/modules/cjs/loader.js:600:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)
    at Function.Module._load (internal/modules/cjs/loader.js:531:3)
    at Module.require (internal/modules/cjs/loader.js:637:17)
    at require (internal/modules/cjs/helpers.js:22:18)
(node:2784) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:2784) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

My node version is : 10.15.3

 "powerbi-visuals-api": "5.1.0",

Thanks for helping!

[Anonymous]

Hi @Anonymous ,

This issue is coming up even if try to create a new visual which by default gets generated when you run the command :- pbiviz new sampleVisual

as well  it is pointing to a node  module  WebsocketServer at this line :

module.exports = class WebsocketServer extends BaseServer {
  static heartbeatInterval = 1000;

Is there any specification that I need to change in my machine for this?

[Anonymous]

HI @Anonymous,

According to the error message, it seems like an 'unexpected token' appeared in your function and you haven't set any ‘try catch’ model to catch/trace the detailed error message do these code directly exited without any results.

I'd like to suggest following the error message code lines to check them and setting if statement to exclude not match value and 'try catch' model to trace detailed error message.

Regards,

Xiaoxin Sheng