Importing angular2-calendar-heatmap causes JIT compilation error

Question

I'm working on an Angular application (version 9.0.3) and I recently wanted to implement a calendar module, so I browsed the web and stumbled across angular2-calendar-heatmap. I decided this was fit for my project, so I decided to add it and it gave the following error:

What I did:

• I installed this dependency through npm install angular2-calendar-heatmap as stated in the installation.
• I declared (and exported) this component in my shared (that's why I also exported, because other modules import the module that exports this) angular module, as stated in the installation.

What I tried

• I tried importing it, instead of declaring it in my module, but this did not change anything about the error.
• I checked if the dependy was correctly added in my package.json, which it is as "angular2-calendar-heatmap": "^0.2.2"

What I already know

• I'm 100% sure that this package is causing this error because without the error it functions normally.

Answer 1

I did find a way to get rid of the error thanks to an answer in this post. I simply quit the current server and restarted it with ng serve.

However, I still have other errors. I get Cannot declare 'CalendarHeatmap' in a NgModule as it's not a part of the current compilation.because CalendarHeatmap is added in declarations, so changed it to imports, but that also didn't solve the issue because this gave the following error: Appears in the NgModule.imports of SharedModule, but could not be resolved to an NgModule class

However, I found another package that also offers calendars and more detailed, it's called angular calendar and seems to offer more options. I also got the same error here. I just had to close the server and restart it with ng serveand then I got it to work.