Type.Record Generating Incorrect Model in Fastify

[LR-EbramMekhail]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Fastify version

4.24.3

Plugin version

4.0.0

Node.js version

v20.11.0

Operating system

Windows

Operating system version (i.e. 20.04, 11.3, 10)

Windows 10 Version 1809

Description

Type.Record from the @sinclair/typebox library does not generate a correct model. Model does not match expected structure. Instead it generates a unrelated Generic Model.

{
  "additionalProp1": "string",
  "additionalProp2": "string",
  "additionalProp3": "string"
}

Steps to Reproduce

const TempModel = Type.Record(Type.String(), Type.Number()) 

export const testRoutes: FastifyPluginAsyncTypebox = async (fastify, opts) => 
{
    fastify.post("/data", {
		schema: {
			description: "returns data",
			tags: [TAG_TEST],
			response: {
				200: TempModel,
			}
		}
	}, async (request, reply) => {
        // DO NOTHING

    });
} 

Output

Expected Behavior

"String": number

Example:

"test": 123

[climba03003]

You should provide the exact version of typebox you use otherwise we cannot determine if the result is related to which library.

[climba03003]

I have double checked the output of typebox between version.
It provides similar output as

{
  "type": "object",
  "patternProperties": { "^(.*)$": { "type": "number" } },
}

The above property patternProperties is unsupported by Swagger UI which means it should not show any field in the output.
Somewhere in your schema is adding { "additionalProperties": { "type": "string" }.