---
jsApi: true
title: "[F] $returnTypeChangedFrom"

---
```ts
$returnTypeChangedFrom(
   context, 
   op, 
   v, 
   oldReturnType): void
```

## Parameters

| Parameter | Type |
| :------ | :------ |
| `context` | `DecoratorContext` |
| `op` | `Operation` |
| `v` | `EnumMember` |
| `oldReturnType` | `any` |

## Returns

`void`
