how to deal with optional dependencies?

[amir-arad]

I've added a conditional import (await import('pixi-lights')) in my plugin, but then when I try to build it it says:

'Error: Invalid value for option "output.file" - when building multiple chunks, the "output.dir" option must be used, not "output.file". To inline dynamic imports, set the "inlineDynamicImports" option.'

Is there a good practice on adding optional imports?