Is it possible to update component variables from within Svelte action?

Question

Can actions update component variables? For example, in the App.svelte below is it possible to update values of disabled and errors?

<script>
  import { form } from './use-form'

  let disabled
  let errors = {}

  const submit = e => {
    const formData = new FormData(e.target)

    const data = {}
    for (let field of formData) {
      const [key, value] = field
      data[key] = value
    }
    console.log(data)
    e.target.reset()
  }
</script>

<form on:submit|preventDefault={submit} use:form={[disabled, errors]}>
  <input name="email" type="email" required />
  {#if errors && errors.email} <p>{errors.email}</p>{/if}
  <input name="password" type="text" minlength="8" required />
  {#if errors && errors.password} <p>{errors.password}</p>{/if}
  <hr />
  <button formnovalidate disabled={!disabled}>submit</button>
</form>

Here's the use-form action:

export const form = (node, [disabled, errors]) => {
  let inputs = node.querySelectorAll('input:invalid')

  const handleBlur = event => {
    ;[...inputs].forEach(e => {
      if (e.value.length === 0) {
        return
      } else {
        errors[e.name] = e.validationMessage
      }
    })

    disabled = node.checkValidity()
  }

  const handleInput = event => {
    ;[...inputs].forEach(e => {
      if (e.value.length === 0) {
        return
      } else {
        errors[e.name] = e.validationMessage
      }
    })

    disabled = node.checkValidity()
  }

  document.addEventListener('blur', handleBlur, true)
  document.addEventListener('input', handleInput, true)

  return {
    update: (disabled, errors) => {
      return disabled, errors
    },
    destroy: () => {
      document.removeEventListener('blur', handleBlur, true)
      document.removeEventListener('input', handleInput, true)
    },
  }
}

To better illustrate what I'm trying to achieve here's a repel with a crude working solution albeit all is sandwiched in one file.