Disable javascript validation

Is there a way to disable typescript validation for javascript files?
On vscode, I can set javascript.validate.enable to false and it disables the validation in javascript files.
I was able to do it by removing @theia/typescript but I have some projects with both flow and typescript in the same workspace.

[original thread by Luiz Guilherme D’Abruzzo Pereira]

no right now, please file an issue