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---
id: BaseQueryNarrowing
title: BaseQueryNarrowing
---
# Interface: BaseQueryNarrowing\<TData, TError\>
## Type Parameters
• **TData** = `unknown`
• **TError** = `DefaultError`
## Properties
### isError()
```ts
isError: (this) => this is CreateBaseQueryResult<TData, TError, CreateStatusBasedQueryResult<"error", TData, TError>>;
```
#### Parameters
##### this
[`CreateBaseQueryResult`](../../type-aliases/createbasequeryresult.md)\<`TData`, `TError`, `QueryObserverResult`\<`TData`, `TError`\>\>
#### Returns
`this is CreateBaseQueryResult<TData, TError, CreateStatusBasedQueryResult<"error", TData, TError>>`
#### Defined in
[types.ts:76](https://github.com/TanStack/query/blob/main/packages/angular-query-experimental/src/types.ts#L76)
---
### isPending()
```ts
isPending: (this) => this is CreateBaseQueryResult<TData, TError, CreateStatusBasedQueryResult<"pending", TData, TError>>;
```
#### Parameters
##### this
[`CreateBaseQueryResult`](../../type-aliases/createbasequeryresult.md)\<`TData`, `TError`, `QueryObserverResult`\<`TData`, `TError`\>\>
#### Returns
`this is CreateBaseQueryResult<TData, TError, CreateStatusBasedQueryResult<"pending", TData, TError>>`
#### Defined in
[types.ts:83](https://github.com/TanStack/query/blob/main/packages/angular-query-experimental/src/types.ts#L83)
---
### isSuccess()
```ts
isSuccess: (this) => this is CreateBaseQueryResult<TData, TError, CreateStatusBasedQueryResult<"success", TData, TError>>;
```
#### Parameters
##### this
[`CreateBaseQueryResult`](../../type-aliases/createbasequeryresult.md)\<`TData`, `TError`, `QueryObserverResult`\<`TData`, `TError`\>\>
#### Returns
`this is CreateBaseQueryResult<TData, TError, CreateStatusBasedQueryResult<"success", TData, TError>>`
#### Defined in
[types.ts:69](https://github.com/TanStack/query/blob/main/packages/angular-query-experimental/src/types.ts#L69)
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