28 lines
856 B
Markdown
28 lines
856 B
Markdown
---
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id: query-options
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title: Mutation Options
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---
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One of the best ways to share mutation options between multiple places,
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is to use the `mutationOptions` helper. At runtime, this helper just returns whatever you pass into it,
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but it has a lot of advantages when using it [with TypeScript](../typescript.md#typing-query-options).
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You can define all possible options for a mutation in one place,
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and you'll also get type inference and type safety for all of them.
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```ts
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export class QueriesService {
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private readonly http = inject(HttpClient)
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updatePost(id: number) {
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return mutationOptions({
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mutationFn: (post: Post) => Promise.resolve(post),
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mutationKey: ['updatePost', id],
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onSuccess: (newPost) => {
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// ^? newPost: Post
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this.queryClient.setQueryData(['posts', id], newPost)
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},
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})
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}
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}
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```
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