import { kysely } from "https://dotland.deno.dev/x/kysely_postgrs_js_dialect@v0.27.3/mod.ts";
const { AlteredColumnBuilder } = kysely;

Allows us to force consumers to do exactly one alteration to a column.

Basically, deny the following:

db.schema.alterTable('person').alterColumn('age', (ac) => ac)

db.schema.alterTable('person').alterColumn('age', (ac) => ac.dropNotNull().setNotNull())

Which would now throw a compilation error, instead of a runtime error.