✨ Add attachments option to text input (#1608)

Closes #854

packages/schemas/features/chat/schema.ts

@@ -29,6 +29,23 @@ import { BubbleBlockType } from '../blocks/bubbles/constants'
 import { clientSideActionSchema } from './clientSideAction'
 import { ChatSession as ChatSessionFromPrisma } from '@typebot.io/prisma'
 
+export const messageSchema = z.preprocess(
+  (val) => (typeof val === 'string' ? { type: 'text', text: val } : val),
+  z.discriminatedUnion('type', [
+    z.object({
+      type: z.literal('text'),
+      text: z.string(),
+      attachedFileUrls: z
+        .array(z.string())
+        .optional()
+        .describe(
+          'Can only be provided if current input block is a text input block that allows attachments'
+        ),
+    }),
+  ])
+)
+export type Message = z.infer<typeof messageSchema>
+
 const chatSessionSchema = z.object({
   id: z.string(),
   createdAt: z.date(),
@@ -183,8 +200,7 @@ export const startChatInputSchema = z.object({
     .describe(
       "[Where to find my bot's public ID?](../how-to#how-to-find-my-publicid)"
     ),
-  message: z
-    .string()
+  message: messageSchema
     .optional()
     .describe(
       "Only provide it if your flow starts with an input block and you'd like to directly provide an answer to it."
@@ -242,7 +258,7 @@ export const startPreviewChatInputSchema = z.object({
       "[Where to find my bot's ID?](../how-to#how-to-find-my-typebotid)"
     ),
   isStreamEnabled: z.boolean().optional().default(false),
-  message: z.string().optional(),
+  message: messageSchema.optional(),
   isOnlyRegistering: z
     .boolean()
     .optional()