---
jsApi: true
title: "[F] checkDuplicateTypeName"

---
```ts
checkDuplicateTypeName(
   program, 
   type, 
   name, 
   existing): void
```

## Parameters

| Parameter | Type |
| :------ | :------ |
| `program` | `Program` |
| `type` | `Type` |
| `name` | `string` |
| `existing` | `undefined` \| `Record`<`string`, `unknown`\> |

## Returns

`void`
