gund/readme.md

## readme.md

      
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    So consider we have Logger class.
And also we have a LoggerInContext class which extends Logger.
And Logger has factory method to create new LoggerInContext instances.
// logger.ts

import { LoggerInContext } from './logger-in-context';

export class Logger {
  // Some methods like log()...
  
  getInContext(context) {
    return new LoggerInContext(context);
  }
}
// logger-in-context.ts

import { Logger } from './logger';

export class LoggerInContext extends Logger {
  constructor(public context) {
    super();
  }
  
  // Here we can override some behavior
}
So as we will try to import logger.ts into our application Webpack will then run into file logger-in-context.ts
but at that time Logger will be undefined so our extend will fail and stack trace will look something like this
(TS compiler is doing his job here as well):
Uncaught TypeError: Cannot read property 'prototype' of undefined
    at __extendsFn (index.js:15)
    at eval (logger-in-context.ts:4)
    at eval (logger-in-context.ts:50)
    at Object../src/app/services/logger/logger-in-context.ts (index.js:718)
    at __webpack_require__ (index.js:48)
    at eval (logger.service.ts:5)
    at Object../src/app/services/logger/logger.service.ts (index.js:726)
    at __webpack_require__ (index.js:48)
    at eval (index.ts:5)
    at Object../src/app/services/logger/index.ts (index.js:702)
    at __webpack_require__ (index.js:48)
    at eval (auth-interceptor.service.ts:7)
    at Object../src/app/services/sso/auth-interceptor/auth-interceptor.service.ts (index.js:742)
    at __webpack_require__ (index.js:48)
    at eval (index.ts:5)

And in generated code error comes from here (simplified a bit):
var logger_1 = __webpack_require__("./src/logger.ts");
// ...
__extends(LoggerInContext, logger_1.Logger); // <--- This is yet undefined