[vlinkz]

Why

Make future Replit River development sandboxes install the project's locked dependencies automatically during environment builds.

What changed

• Add an executable .nexus/hooks/on_build that locates the repository root relative to itself and runs npm ci.
• The hook works when invoked from the environment workspace root as well as from the repository.

Validation

• bash -n passed for the hook.
• From outside the repository, bash river/.nexus/hooks/on_build installed all locked dependencies successfully without changing tracked application files.
• npm run check passed after the final hook change.
• The unchanged application tree previously passed npm run test:single (37 files, 815 passed, 1 skipped) and npm run build.
• The saved replit-river environment now explicitly invokes this hook during its build. Fresh-image verification remains blocked: the latest two builds failed before checkout with "build repl is not ready". An earlier successful image did not contain node_modules, so dependency preinstallation has not yet been verified in a fresh image.
• CI was pending when checked after commit 4ac58c5.

Versioning

• Breaking protocol change
• Breaking ts/js API change

~ written by ⠕ Replit