output of change

The type of the answer.

Value

A type. Left out, a change written with run answers nothing, whatever its run gives back, and one written with set the row of its write. The type of a call says the same: await app.as(user).call(addOrder, {...}) of a change with run and no output is nothing.

To answer a row from a run, state its fields as an object: only what output names leaves the function. A change written with run that answers a record which code takes, and states no output, is code.T7009, which the check finds.

Example

export const addOrder = change('addOrder', {
  access: 'signedIn',
  input: { customer: link('customers'), total: number({ min: 0, whole: true }) },
  output: object({ id: link('orders'), total: number(), placedBy: link('users') }),
  run: ({ input, db, user }) => db.orders.add({ customer: input.customer, total: input.total, placedBy: user?.id }),
})

Errors

code.T7009: a change written with run answers a record that code takes, and states no output.

See also

word.change