Ember.js - Parsing error: Unexpected token, expected ";" in config/environment.d.ts(.js)

I see that error/warning in every build or run.

...lisweb_frontend/app/config/environment.d.ts
  10:9  error  Parsing error: Unexpected token, expected ";"

   8 |  * since different ember addons can materialize new entries.
   9 |  */
> 10 | declare const config: {
     |         ^
  11 |   environment: any;
  12 |   modulePrefix: string;
  13 |   podModulePrefix: string;

✖ 1 problem (1 error, 0 warnings)

But the project works. I tried to change from ".ts" to ".ts" but the problem still the same. The project(Public for limited time): https://github.com/hotsoft-informatica/lisweb_frontend/

Have anyone an idea about how to solve that?

Thanks!