Build flatpak locally

flatpak-node-generator npm ../package-lock.json -o generated-sources.json
flatpak-builder build zone.dos.Browser.yaml --install-deps-from=flathub --force-clean --user --install

To enter build shell:

flatpak-builder build --install-deps-from=flathub --force-clean --user --install zone.dos.Browser.yaml --build-shell=dos-browser

To validate:

flatpak run --command=flatpak-builder-lint org.flatpak.Builder manifest zone.dos.Browser.yaml
flatpak run --command=flatpak-builder-lint org.flatpak.Builder appstream zone.dos.Browser.metainfo.xml

Run flatpak

flatpak run zone.dos.browser