Javascript ES6 TypeError Class constructor Client cannot be invoked without new

0 votes

I have a class written in Javascript ES6. When I try to execute nodemon command I always see this error TypeError: Class constructor Client cannot be invoked without 'new'

The full error is mentioned below:

/Users/akshaysood/Blockchain/fabricSDK/dist/application/Transaction.js:45
        return (0, _possibleConstructorReturn3.default)(this, (FBClient.__proto__ || (0, _getPrototypeOf2.default)(FBClient)).call(this, props));
                                                                                                                              ^

TypeError: Class constructor Client cannot be invoked without 'new'
    at new FBClient (/Users/akshaysood/Blockchain/fabricSDK/dist/application/Transaction.js:45:127)
    at Object.<anonymous> (/Users/akshaysood/Blockchain/fabricSDK/dist/application/Transaction.js:195:14)
    at Module._compile (module.js:641:30)
    at Object.Module._extensions..js (module.js:652:10)
    at Module.load (module.js:560:32)
    at tryModuleLoad (module.js:503:12)
    at Function.Module._load (module.js:495:3)
    at Module.require (module.js:585:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/Users/akshaysood/Blockchain/fabricSDK/dist/routes/users.js:11:20)

What I am trying to do is, I have created a class and then created an instance of that class. Then I am trying to export that variable.

The class structure is defined below:

class FBClient extends FabricClient{

    constructor(props){
        super(props);
    }

<<< FUNCTIONS >>>

}

How I am trying to export the variable ->

var client = new FBClient();
client.loadFromConfig(config);

export default client = client;
May 5, 2020 in Blockchain by kartik
• 37,530 points
13,126 views

1 answer to this question.

0 votes

Hello @kartik,

In package.json you can use targets configuration with @babel/preset-env. set the esmodules as 'true'.

Below is the example how I am using in my file:

  "babel": {
    "presets": [
      [
        "@babel/preset-env",
        {
          "targets": {
            "esmodules": true
          }
        }
      ],
      "@babel/preset-react",
      "@babel/preset-flow"
    ],
    "plugins": [
      "@babel/plugin-proposal-class-properties"
    ]
  },

Hope it works! and if you need to know more about javascript, then you should join one of our Java certification class without any delay.

Thank You!!

answered May 5, 2020 by Niroj
• 82,820 points

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