How to check if a source or a layer already exists

[mariusvn]

How to check if a source or a layer already exists.

I might need to do a pull request

[mariusvn]

Also, when we add a source that already exists, the error is in the library but not in the app using it

[BartoszStasiurka]

I always register source /layer even if there is an empty dataset and I don't care if it is already registered.

[mariusvn]

Would be nice if there was a way to get the liste of current layers on the map

[GaelleJoubert]

I personnally get layers with the function :
await mapController.getLayerIds() ;

But I would really apreciate a way to get the sources like that.
Because if I try to add a source with the same name, it crashes the app.

[mariusvn]

Oh i wasn't aware of this method, thanks for the tip.
I'll work a bit today on the lib, i'll check if i can add it

[mariusvn]

@GaelleJoubert resolved in PR #197
I added the getSourceIds