How to get just tables from schema?

[FamilyMan]

I am getting the schema by using the following code:

async function getSchema(connection) {
return await connection.schema(20, [null, null]);
}
I really want to use:

async function getSchema(connection) {
return await connection.schema(20, [null, null, null, "TABLE"]);
}
to return just tables, but using the third null returns an empty array because the TABLE_NAME is not null, what is the right syntax here?

I realise this is for reporting issues, but I can't find where to ask general use questions.