@adonisjs/lucid/build/adonis-typings/test-utils.d.ts

declare module '@ioc:Adonis/Core/TestUtils' {
    type HookCleanupHandler = () => Promise<void>;
    type HookCallback = () => Promise<HookCleanupHandler> | Promise<void>;
    interface TestUtilsContract {
        db(connectionName?: string): {
            seed: HookCallback;
            migrate: HookCallback;
        };
    }
}