how to get type bigint return type "number | undefined" in schema ?

my schema looks like this:
export const buckets = pgTable('buckets', {
...
allowed_size_limit: bigint(mode{:number}).notNull()
// returns "number"

allowed_size_limit: bigint().notNull(),
// returns bigint | undefined
...
}

I don't get the required supabase storage type for property "allowed_size_limit" : "number | undefined"

Any help is very appreciated.
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