ts-md5 | Type Script MD5 implemenation | Runtime Evironment library

I am trying to generate an id that is generated in the backend, in the frontend (not the best of practices, I know). The id is an Md5 hash of several (dynamically generated, i.e, I don't know the hash in advance) strings concatenated together. So what I tried to do is to use the Md5 class (in ts-md5/dist/md5) to create an Md5 hash:

I am having some issues with my Angular 5, when I try to run ng serve.

The issue that is happening is the followig:

I received a hot potato of an Angular 4.4 application which is quite fragile. When I try to update the auth0-js module the app stops loading and its bootstrap component constructor is never called. It loads the initial html, runs app.module.ts and main.ts. Then it appears to just stop. I've gone through debugging, single-stepping, several times in Chrome & FF developer tools. It just seems to stop. I've put all sorts of console.log statements at loading and constructors of various components and modules. It apparently never calls the constructor of app.component.ts.

I have carefully isolated the changes to required modules from the auth0-js module. There is only one required module, qs, which is also used by my code or any other js modules. The other required modules are only used by auth0-js. I froze the top level qs version and forced npm to install that as a dependency of auth0-js when upgrading. I can find no changes that could cause this breakage.

And, as far as the auth0-js library itself, I have already made use of the latest version in another similar project. And, the code executed before the app just stops does not include any calls to auth0-js. In other words, that code is not touched before the app stops running.

Building is done with the Angular CLI version 1.7.4, installed local to the project (in ./node_modules/). Then it is built/launched via ng serve --env local. That server seems a black box with no useful logging. I switched to serving via nginx and building via ng build --output-hashing=all --env local. Still not getting any further. Its been several weeks and my forehead is becoming concave. Any and all suggestions are more than welcome.

Here is my main.ts

I've got a problem with running tests. After running ng test command, the command line shows

How can I fix the error below:

I have been trying to deploy my Angular 5 application, into Heroku. I already did this for other projects, but for this one, there might have some dependency problem and I can not do the same.

On my local machine, I can run ng build without any errors.

On the other hand, when Heroku is running this command (ng build), I receive the following error: