refactor(middleware): use deepmerge-ts to merge context object

packages/next-safe-action/package.json

@@ -71,6 +71,7 @@
 		"@types/node": "^20.14.11",
 		"@types/react": "^18.3.1",
 		"@types/react-dom": "18.3.0",
+		"deepmerge-ts": "^7.1.0",
 		"eslint": "^8.57.0",
 		"eslint-config-prettier": "^9.1.0",
 		"eslint-define-config": "^2.1.0",

packages/next-safe-action/src/action-builder.ts

@@ -1,3 +1,4 @@
+import { deepmerge } from "deepmerge-ts";
 import { isNotFoundError } from "next/dist/client/components/not-found.js";
 import { isRedirectError } from "next/dist/client/components/redirect.js";
 import type {} from "zod";
@@ -13,7 +14,7 @@ import type {
 	ServerCodeFn,
 	StateServerCodeFn,
 } from "./index.types";
-import { ActionMetadataError, deepMerge, DEFAULT_SERVER_ERROR_MESSAGE, isError } from "./utils";
+import { ActionMetadataError, DEFAULT_SERVER_ERROR_MESSAGE, isError } from "./utils";
 import { ActionServerValidationError, ActionValidationError, buildValidationErrors } from "./validation-errors";
 import type {
 	BindArgsValidationErrors,
@@ -121,7 +122,7 @@ export function actionBuilder<
 									ctx: currentCtx,
 									metadata: args.metadata,
 									next: async (nextOpts) => {
-										currentCtx = deepMerge(currentCtx, nextOpts?.ctx ?? {});
+										currentCtx = deepmerge(currentCtx, nextOpts?.ctx ?? {});
 										// currentCtx = { ...cloneDeep(currentCtx), ...(nextOpts?.ctx ?? {}) };
 										await executeMiddlewareStack(idx + 1);
 										return middlewareResult;

packages/next-safe-action/src/utils.ts

@@ -2,22 +2,6 @@ export const DEFAULT_SERVER_ERROR_MESSAGE = "Something went wrong while executin
 
 export const isError = (error: unknown): error is Error => error instanceof Error;
 
-export const deepMerge = (obj1: object, obj2: object) => {
-	for (const key of Object.keys(obj2)) {
-		const k = key as keyof typeof obj2;
-		// eslint-disable-next-line
-		if (typeof obj2[k] === "object" && Object.hasOwn(obj1, k)) {
-			// @ts-expect-error
-			if (!obj1[k]) obj1[k] = {};
-			deepMerge(obj1[k], obj2[k]);
-		} else {
-			obj1[k] = obj2[k];
-		}
-	}
-
-	return obj1;
-};
-
 /**
  * This error is thrown when an action's metadata input is invalid, i.e. when there's a mismatch between the
  * type of the metadata schema returned from `defineMetadataSchema` and the actual input.