possibly you use google and find:
https://marketplace.visualstudio.com/items?itemName=Tobiah.language-pde ,
https://github.com/TobiahZ/processing-vscode ,
please remember that with questions about using other IDE or editors
it might be difficult to find someone here who can respond.
also when you have coding questions
please post code ( as a MCVE )
only in a version what runs ( copy / paste ) in the Processing IDE 3.5.3
( or when required add files supplied as zip )
using external tools you might miss reference, examples, library help …
you might come back to PDE, ( even if just for learning )
anyhow have fun coding…