[BUG] Javascript babel, weird output for comment block

Created by: jdorel

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

Using the javascript client module, when using npm run build, the first block comment in the files in src get distorted with a lot of blank spaces and renders navigation of the code really slow.

Initial block comment:

/**
 * Custom API
 * Custom API
 *
 * OpenAPI spec version: 0.0.1
 * 
 *
 * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
 * https://openapi-generator.tech
 * Do not edit the class manually.
 *
 */

Block comment modified by babel and code added:

"use strict";

Object.defineProperty(exports, "__esModule", {
    value: true
});

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }(); /**
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * Custom API
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * Custom API
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      *
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * OpenAPI spec version: 0.0.1
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      *
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * https://openapi-generator.tech
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * Do not edit the class manually.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      *
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      */

Removing the .babelrc appears to prevent this distorsion.

openapi-generator version

4.0.0-beta3

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  title: Custom API
  description: Custom API
  version: 0.0.1
servers:
- url: "/api/v1"
paths:
  /custom:
    get:
      summary: Returns a custom object
      operationId: app.custom
      responses:
        '200':
          description: Custom found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/object'
        '404':
          description: Custom not found

components:
  schemas:
    object:
      description: Custom value
      type: number

Command line used for generation

npx openapi-generator generate --skip-validate-spec -i custom.yml -g javascript -o custom_api_javascript

Steps to reproduce

After generating the module:

cd custom_api_javascript
npm install
npm run build

Related issues/PRs

None

Suggest a fix

Remove .babelrc, but it might be used for other things.