hotfix: fix ValidationResult interface (#4045) (#4070)

* fix: fix ValidationResult interface (#4045)

* docs(typescript): update src links

for types: ValidationResult, FastifyError

* test(types): update ValidationResult inteface test

- define object properties of ajv error object

* feat(types): update ValidationResult interface

- ValidationResult extends ajv's ErrorObject

* fix(types): fix ValidationResult interface

- replace ajv interface with plain properties

docs/Reference/TypeScript.md

@@ -1359,7 +1359,7 @@ A method for checking the existence of a type parser of a certain content type
 
 ##### fastify.FastifyError
 
-[src](https://github.com/fastify/fastify/blob/main/types/error.d.ts#L17)
+[src](https://github.com/fastify/fastify/blob/main/fastify.d.ts#L179)
 
 FastifyError is a custom error object that includes status code and validation
 results.
@@ -1369,7 +1369,7 @@ properties: `statusCode: number` and `validation: ValiationResult[]`.
 
 ##### fastify.ValidationResult
 
-[src](https://github.com/fastify/fastify/blob/main/types/error.d.ts#L4)
+[src](https://github.com/fastify/fastify/blob/main/fastify.d.ts#L184)
 
 The route validation internally relies upon Ajv, which is a high-performance
 JSON schema validator.

fastify.d.ts

@@ -183,10 +183,10 @@ declare module '@fastify/error' {
 
 export interface ValidationResult {
   keyword: string;
-  dataPath: string;
+  instancePath: string;
   schemaPath: string;
   params: Record<string, string | string[]>;
-  message: string;
+  message?: string;
 }
 
 /* Export all additional types */

test/types/fastify.test-d.ts

@@ -7,8 +7,10 @@ import fastify, {
   LightMyRequestChain,
   LightMyRequestResponse,
   LightMyRequestCallback,
-  InjectOptions, FastifyBaseLogger
+  InjectOptions, FastifyBaseLogger,
+  ValidationResult
 } from '../../fastify'
+import { ErrorObject as AjvErrorObject } from 'ajv'
 import * as http from 'http'
 import * as https from 'https'
 import * as http2 from 'http2'
@@ -208,3 +210,12 @@ fastify().then(fastifyInstance => expectAssignable<FastifyInstance>(fastifyInsta
 expectAssignable<FastifyPluginAsync>(async () => {})
 expectAssignable<FastifyPluginCallback>(() => {})
 expectAssignable<FastifyPlugin>(() => {})
+
+const ajvErrorObject: AjvErrorObject = {
+  keyword: '',
+  instancePath: '',
+  schemaPath: '',
+  params: {},
+  message: ''
+}
+expectAssignable<ValidationResult>(ajvErrorObject)