# X_SIDE_EFFECTS_BY_USE_STALE

## Means

a `SIDE_EFFECTS_BY_USE` row that no longer holds

## Typical cause

the row names a module its package also lists in `sideEffects` (the array wins and the module rides in every chunk reaching the barrel), a module that runs nothing at import time, or one an entry imports bare (a bundler that honours the array drops a bare import of an unlisted module)

## Fix

`grep -n -A16 'SIDE_EFFECTS_BY_USE' scripts/side-effects.ts` — delete the row, or delete the array entry, as the cause names

[CLI and verify](/error-codes#cli-and-verify)