How to Define a Type for Schema.Struct, Schema.Class, and Schema.extend in TypeScript?

function withSchema<F>(schema: /* what to have the type */) {}

function withSchema<F extends Schema.Struct.Fields | undefined = undefined>(schema: Schema.Struct<Exclude<F, undefined>> & Schema.Schema<Schema.Schema.Type<Schema.Struct<Exclude<F, undefined>>>, Schema.Schema.Encoded<Schema.Struct<Exclude<F, undefined>>>, never>) {}