Use desiredProperties in transformAttachment (#3134)

* Use desiredProperties in transformAttachment

* remove not necessary payload checks

* add checks for payload

packages/bot/src/transformers/attachment.ts

@@ -1,23 +1,48 @@
 import type { DiscordAttachment } from '@discordeno/types'
 import type { Bot } from '../index.js'
-import type { Optionalize } from '../optionalize.js'
 
 // eslint-disable-next-line @typescript-eslint/explicit-function-return-type
 export function transformAttachment(bot: Bot, payload: DiscordAttachment) {
-  const attachment = {
-    id: bot.transformers.snowflake(payload.id),
-    filename: payload.filename,
-    contentType: payload.content_type,
-    size: payload.size,
-    url: payload.url,
-    proxyUrl: payload.proxy_url,
-    height: payload.height ?? undefined,
-    width: payload.width ?? undefined,
-    ephemeral: payload.ephemeral,
-    description: payload.description,
+  const props = bot.transformers.desiredProperties.attachment
+  const attachment = {} as Attachment
+
+  if (props.id && payload.id) attachment.id = bot.transformers.snowflake(payload.id)
+  if (props.filename && payload.filename) attachment.filename = payload.filename
+  if (props.contentType && payload.content_type) attachment.contentType = payload.content_type
+  if (props.size && payload.size) attachment.size = payload.size
+  if (props.url && payload.url) attachment.url = payload.url
+  if (props.proxyUrl && payload.proxy_url) attachment.proxyUrl = payload.proxy_url
+  if (props.height && payload.height) attachment.height = payload.height
+  if (props.width && payload.width) attachment.width = payload.width
+  if (props.ephemeral && payload.ephemeral) attachment.ephemeral = payload.ephemeral
+  if (props.description && payload.description) attachment.description = payload.description
+
+  return attachment
 }
 
-  return attachment as Optionalize<typeof attachment>
+export interface Attachment {
+  /** Name of file attached */
+  filename: string
+  /** The attachment's [media type](https://en.wikipedia.org/wiki/Media_type) */
+  contentType?: string
+  /** Size of file in bytes */
+  size: number
+  /** Source url of file */
+  url: string
+  /** A proxied url of file */
+  proxyUrl: string
+  /** Attachment id */
+  id: bigint
+  /** description for the file (max 1024 characters) */
+  description?: string
+  /** Height of file (if image) */
+  height?: number
+  /** Width of file (if image) */
+  width?: number
+  /**
+   * whether this attachment is ephemeral.
+   * Ephemeral attachments will automatically be removed after a set period of time.
+   * Ephemeral attachments on messages are guaranteed to be available as long as the message itself exists.
+   */
+  ephemeral?: boolean
 }
-
-export interface Attachment extends ReturnType<typeof transformAttachment> {}