@apollo/client/utilities/types/NoInfer.d.ts

A fully-featured caching GraphQL client.

/**
Helper type that allows using a type in a way that cannot be "widened" by inference on the value it is used on.

This type was first suggested [in this Github discussion](https://github.com/microsoft/TypeScript/issues/14829#issuecomment-504042546).

Example usage:
```ts
export function useQuery<
  TData = any,
  TVariables extends OperationVariables = OperationVariables,
>(
  query: DocumentNode | TypedDocumentNode<TData, TVariables>,
  options: QueryHookOptions<NoInfer<TData>, NoInfer<TVariables>> = Object.create(null),
)
```
In this case, `TData` and `TVariables` should be inferred from `query`, but never widened from something in `options`.

So, in this code example:
```ts
declare const typedNode: TypedDocumentNode<{ foo: string}, { bar: number }>
const { variables } = useQuery(typedNode, { variables: { bar: 4, nonExistingVariable: "string" } });
```
Without the use of `NoInfer`, `variables` would now be of the type `{ bar: number, nonExistingVariable: "string" }`.
With `NoInfer`, it will instead give an error on `nonExistingVariable`.
 */
export type NoInfer<T> = [T][T extends any ? 0 : never];
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