remix-run/remix · error · AssertionError

expected promise to reject, but it resolved with: ${stringif

Error message

expected promise to reject, but it resolved with: ${stringify(result.value)}

What it means

`remix db seed` requires a seed script path from `db.seed` in `remix.json` or the `--seed` flag. This is the plan-time check in `resolveDatabaseCommandPlan`; without a seed path the plan cannot be built because there's nothing to execute.

Source

Thrown at packages/assert/src/lib/expect.ts:478

    }
  }

  function buildMatcher(matcher: keyof Matchers) {
    return async (...args: unknown[]) => {
      let result = await settle()
      if (mode === 'resolves') {
        if (!result.resolved) {
          throw new AssertionError({
            message: `expected promise to resolve, but it rejected with: ${stringify(result.error)}`,
            actual: result.error,
            operator: `resolves.${matcher}`,
          })
        }
        let m = createMatchers(result.value, negated) as any
        m[matcher](...args)
      } else {
        if (result.resolved) {
          throw new AssertionError({
            message: `expected promise to reject, but it resolved with: ${stringify(result.value)}`,
            actual: result.value,
            operator: `rejects.${matcher}`,
          })
        }
        // For rejects.toThrow we check the error against the expected matcher.
        if (matcher === 'toThrow') {
          let pass = checkErrorMatch(result.error, args[0])
          if (negated ? pass : !pass) {
            throw new AssertionError({
              message:
                (negated ? 'expected not ' : 'expected ') +
                `error to be ${describeExpectedError(args[0])}, got ${stringify(result.error)}`,
              actual: result.error,
              expected: args[0],
              operator: `rejects.toThrow`,
            })
          }

View on GitHub (pinned to 9696913134)

Solutions

1. Pass `--seed ./db/seed.ts` on the command line
2. Add `"seed": "./db/seed.ts"` to the `db` section of remix.json
3. Create the seed script first if it doesn't exist yet

Example fix

# before
remix db seed
# after
remix db seed --seed ./db/seed.ts

let config = JSON.parse(fs.readFileSync('remix.json','utf8'));
let seed = config?.db?.seed ?? './db/seed.ts';
run(['remix','db','seed','--seed',seed])

When it happens

Trigger: Running `remix db seed` when both `config.db.seed` is absent from remix.json and no `--seed` flag was passed.

Common situations: Fresh apps with no seed script configured yet; config has migrations but omits seed; assuming a default `seed.ts` is auto-detected.

Related errors

• throw new AssertionError({ message, actual, expected, operat
• expect(received).toThrow() requires a function (got ${typeof
• expected promise to resolve, but it rejected with: ${stringi
• ${optionName} values must be strings
• throw new TypeError(message)

AI-assisted analysis of remix-run/remix@9696913134 (2026-08-27). Data as JSON: /api/errors/44f5695b6e5fafd2. Report an issue: GitHub.