feat(ccc): support extensions

packages/ccc/src/define/card.ts

@@ -30,6 +30,11 @@ interface CardMeta {
 }
 
 interface CardAdditional {
+  /**
+   * Extensions.
+   * - extensions
+   */
+  extensions?: Data['extensions']
   /**
    * First message and alternate greetings.
    *

packages/ccc/src/export/json.ts

@@ -9,7 +9,16 @@ export const exportToJSON = (data: Card): CharacterCardV3 => ({
     creator_notes: data.notes ?? '',
     creator_notes_multilingual: data.notesMultilingual,
     description: '', // TODO: add description // FIXME: important
-    extensions: {}, // TODO: add extensions
+    extensions: {
+      depth_prompt: {
+        depth: 4,
+        prompt: '',
+        role: 'system',
+      },
+      fav: false,
+      talkativeness: 0.5,
+      ...data.extensions,
+    },
     first_mes: data.greetings?.[0] ?? '',
     group_only_greetings: data.greetingsGroupOnly ?? [],
     mes_example: '', // TODO: add mes_example

packages/ccc/src/export/types/extensions.ts

@@ -1 +1,25 @@
-export interface Extensions extends Record<string, unknown> {}
+export interface Extensions extends Record<string, unknown> {
+  /**
+   * @default
+   * ```ts
+   * {
+   *   depth: 4,
+   *   prompt: '',
+   *   role: 'system',
+   * }
+   * ```
+   */
+  depth_prompt?: ExtensionsDepthPrompt
+  /** @default `false` */
+  fav?: boolean
+  /** @default `0.5` */
+  talkativeness?: number
+  /** @default `undefined` */
+  world?: string
+}
+
+export interface ExtensionsDepthPrompt {
+  depth: number
+  prompt: string
+  role: 'system' | ({} & string)
+}