Validation can be made smarter for some checks, like length of strings, etc; take for example the following:

Guid id = ...;

return cx($"<button customId='my-awesome-custom-id-{id}' label='foo' />");

The type Guid has a known length for its ToString() function, this could be taken into account with the validations.

It would also be good to ensure the following constraints are implemented and tested:

• ActionRow

  • children: 5 (Button, Select (all))

• Button

  • label: 80 (string)

• Container

  • children: >= 1 (ActionRow, File, MediaGallery, Section, Separator, TextDisplay)

• File

  • Can only be a local file.

• FileUpload

  • min_values: 0 <= 10 (int)
  • max_values: 1 <= 10 (int)

• Label

  • text: 45 (string)
  • description: 100 (string)
  • component: 1 (TextInput, Select (all), FileUpload)

• MediaGallery

  • items: 10 (MediaGalleryItem)
  • MediaGalleryItem
  • description: 256 (string)
  • Can be either local file or an URL.

• Select

  • placeholder: 150 (string)
  • min_values: 0 <= len(options) <= 25 (int)
  • max_values: 1 <= len(options) <= 25 (int)
  • default_values: min_values <= max_values (list[Snowflake])
  • channel_types: 0 <= 25 (list[ChannelType])
  • options: 25 (list[SelectOption])

• SelectOption

  • label: 100 (string)
  • value: 100 (string)
  • description: 100 (string)

• Section

  • accessory: 1 (Button, Thumbnail)
  • children: 1 <= 3 (TextDisplay)

• Separator

  • Only a top-level component

• TextInput

  • label: 45 (string)
  • placeholder: 100 (string)
  • min_length: 0 <= 4000 (int)
  • max_length: 1 <= 4000 (int)
  • value/default: 4000 (string)

• TextDisplay

  • content: 1 <= 4000 (total in one message) (string)

• Thumbnail

  • description: 256 (string)
  • Can be either local file or an URL.

• custom_id: 100 (string)

• id: 0 <= 2_147_483_647 (int)

• LayoutView: 40 (including all nested) (ActionRow, Container, File, MediaGallery, Section, Separator, TextDisplay)

• Modal: 5 (top level) (Label, TextDisplay)

• View: 25 (top level) (Button, Select (all))