feat(core): add context as second parameter of mutation function

Author: asermax

packages/query-core/src/mutation.ts

@@ -3,6 +3,7 @@ import { Removable } from './removable'
 import { createRetryer } from './retryer'
 import type {
   DefaultError,
+  MutationFunctionContext,
   MutationMeta,
   MutationOptions,
   MutationStatus,
@@ -167,7 +168,11 @@ export class Mutation<
         if (!this.options.mutationFn) {
           return Promise.reject(new Error('No mutationFn found'))
         }
-        return this.options.mutationFn(variables)
+        const mutationFnContext: MutationFunctionContext = {
+          mutationKey: this.options.mutationKey,
+          meta: this.meta,
+        }
+        return this.options.mutationFn(variables, mutationFnContext)
       },
       onFail: (failureCount, error) => {
         this.#dispatch({ type: 'failed', failureCount, error })

packages/query-core/src/types.ts

@@ -888,8 +888,14 @@ export type MutationMeta = Register extends {
     : Record<string, unknown>
   : Record<string, unknown>
 
+export type MutationFunctionContext = {
+  mutationKey?: MutationKey
+  meta: MutationMeta | undefined
+}
+
 export type MutationFunction<TData = unknown, TVariables = unknown> = (
   variables: TVariables,
+  context: MutationFunctionContext,
 ) => Promise<TData>
 
 export interface MutationOptions<