To update data in a table, use .updateTable():

await db
  .updateTable('tablename')
  .values({ name: 'test' })
  .where('id', '=', 1)
  .execute()

This corresponds to the SQL query:

UPDATE tablename SET id=1 WHERE name='test';

Lessons this unit:

0:	Introduction
1:	Installing Kysely
2:	Select queries
3:	Inserting data
4:	Deleting data
5:	▶︎ Updating data
6:	Joins