Hooks

runSeeders accepts lifecycle callbacks that fire around each seeder:

await runSeeders([UserSeeder, PostSeeder], {
  em,
  onBefore: (seeder) => console.log(`Starting ${seeder.name}...`),
  onAfter: (seeder, durationMs) => console.log(`${seeder.name} done in ${durationMs}ms`),
  onError: (seeder, error) => console.error(`${seeder.name} failed`, error),
})

Callback	When it fires
onBefore(seeder)	Before each seeder runs
onAfter(seeder, durationMs)	After each seeder completes successfully
onError(seeder, error)	When a seeder throws — the error is still re-thrown after this returns

Skipping seeders

Pass a skip callback to conditionally bypass individual seeders. Return true to skip, false (or nothing) to run:

const alreadyRun = new Set(['UserSeeder'])

await runSeeders([UserSeeder, PostSeeder], {
  em,
  skip: (seeder) => alreadyRun.has(seeder.name),
})
// UserSeeder is skipped, PostSeeder runs normally

Skipped seeders do not trigger onBefore, onAfter, or onError.