add stepable schema

src/use-cases/task/interfaces/stepable.ts

@@ -1,3 +1,5 @@
+import { isValid, v } from 'suretype'
+
 export interface Stepable {
   id: string
   title: string
@@ -8,3 +10,12 @@ export interface Stepable {
    */
   totalEstimation: number
 }
+
+const stepableSchema = v.object({
+  id: v.string().minLength(1).required(),
+  title: v.string().minLength(1).required(),
+  estimation: v.number(),
+  totalEstimation: v.number().required()
+})
+
+const isValidStepable = (data: unknown) => isValid(stepableSchema, data)