⚡ (bot) Improve variables parsing and predictability

packages/models/typebot/variable.ts

@@ -3,10 +3,21 @@ import { z } from 'zod'
 export const variableSchema = z.object({
   id: z.string(),
   name: z.string(),
-  value: z.string().or(z.number()).optional(),
+  value: z.string().optional().nullable(),
 })
 
+/**
+ * Variable when retrieved from the database
+ */
 export type VariableWithValue = Omit<Variable, 'value'> & {
   value: string
 }
+
+/**
+ * Variable when computed or retrieved from a block
+ */
+export type VariableWithUnknowValue = Omit<VariableWithValue, 'value'> & {
+  value: unknown
+}
+
 export type Variable = z.infer<typeof variableSchema>