Below is a procedure to test changes to the stand-alone studio. It creates a local package file that can be used to test the full experience of using the stand-alone studio, including the installation process (analogous to npx @freesewing/studio).
% cd packages/studio
% npm pack
freesewing-studio-4.0.0.tgz
% cp freesewing-studio-4.0.0.tgz /tmp
% cd /tmp
% npx ./freesewing-studio-4.0.0.tgz
(Information copied from https://codeberg.org/freesewing/freesewing/pulls/355