Creating a phone number schema with specific formatting and length constraints can be a bit trick...

const PhoneNumberSchema = Schema.compose(
  Schema.TemplateLiteral(
    Schema.String.pipe(Schema.length(3)),
    '-',
    Schema.String.pipe(Schema.length(3)),
    '-',
    Schema.String.pipe(Schema.length(4))
  ),
  Schema.Trim.pipe(Schema.length(12))
).pipe(Schema.brand('phoneNumber'));

export const PhoneNumberSchema = Schema.compose(
  Schema.TemplateLiteral(Schema.String, '-', Schema.String, '-', Schema.String),
  Schema.Trim.pipe(Schema.length(12))
).pipe(Schema.brand('phoneNumber'))

export const validateSignUpForm = (formValues: {
  firstName: string
  lastName: string
  phoneNumber: typeof PhoneNumberSchema.Type
  validatedCorporationNumber: typeof ValidatedCorporationNumber.Type
}) => {
  return Schema.decodeEither(SignUpFormSchema)(formValues).pipe( // <--- type string & Brand<"phonenumber"> is not assignable to type `${string}-${string}-${string}`
    Either.match({
      onLeft: () => 'invalid form',
      onRight: () => 'the form is valid'
    })
  )
}