Drab webpack problem - Uncaught ReferenceError: require is not defined

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This is code is giving error

var params = Object.assign({ __drab_return: this.drab_return_token }, additional_token);
      params = Object.assign(params, {__client_lib_version: Drab.client_lib_version});
      this.socket = new this.Socket("/socket", { //error at this line
        params: params
      });