fix(UseMutationResult): MutationState type should be more specific, to allow narrowing to match useQuery

Author: raoufswe

src/react/types.ts

@@ -119,7 +119,7 @@ export type UseMutateAsyncFunction<
   options?: MutateOptions<TData, TError, TVariables, TContext>
 ) => Promise<TData>
 
-export interface UseMutationResult<
+export interface UseMutationBaseResult<
   TData = unknown,
   TError = unknown,
   TVariables = unknown,
@@ -140,3 +140,74 @@ export interface UseMutationResult<
   status: MutationStatus
   variables: TVariables | undefined
 }
+
+export interface UseMutationIdleResult<
+  TData = unknown,
+  TError = unknown,
+  TVariables = unknown,
+  TContext = unknown
+> extends UseMutationBaseResult<TData, TError, TVariables, TContext> {
+  data: undefined
+  error: null
+  isError: false
+  isIdle: true
+  isLoading: false
+  isSuccess: false
+  status: 'idle'
+}
+
+export interface UseMutationLoadingResult<
+  TData = unknown,
+  TError = unknown,
+  TVariables = unknown,
+  TContext = unknown
+> extends UseMutationBaseResult<TData, TError, TVariables, TContext> {
+  data: undefined
+  error: null
+  isError: false
+  isIdle: false
+  isLoading: true
+  isSuccess: false
+  status: 'loading'
+}
+
+export interface UseMutationErrorResult<
+  TData = unknown,
+  TError = unknown,
+  TVariables = unknown,
+  TContext = unknown
+> extends UseMutationBaseResult<TData, TError, TVariables, TContext> {
+  data: undefined
+  error: TError
+  isError: true
+  isIdle: false
+  isLoading: false
+  isSuccess: false
+  status: 'error'
+}
+
+export interface UseMutationSuccessResult<
+  TData = unknown,
+  TError = unknown,
+  TVariables = unknown,
+  TContext = unknown
+> extends UseMutationBaseResult<TData, TError, TVariables, TContext> {
+  data: TData
+  error: null
+  isError: false
+  isIdle: false
+  isLoading: false
+  isSuccess: true
+  status: 'success'
+}
+
+export type UseMutationResult<
+  TData = unknown,
+  TError = unknown,
+  TVariables = unknown,
+  TContext = unknown
+> =
+  | UseMutationIdleResult<TData, TError, TVariables, TContext>
+  | UseMutationLoadingResult<TData, TError, TVariables, TContext>
+  | UseMutationErrorResult<TData, TError, TVariables, TContext>
+  | UseMutationSuccessResult<TData, TError, TVariables, TContext>