I use knex to manage mysql connections,knex uses declare module 'knex/types/tables' to enhance type checking(knex typescript doc)

My type definition file is like this:
client.ts

import knex, { Knex } from "knex";
import knexConfig from "../knexfile";
//Init knex
export const client = knex(knexConfig);

declare module "knex/types/tables" {
//someting
}

tsc can correctly output type definition files containing declare module 'knex/types/tables', but tsup can't