fix(js): Handle undefined values in object equality checks (#1460)

js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "langsmith",
-  "version": "0.3.2",
+  "version": "0.3.3",
   "description": "Client library to connect to the LangSmith LLM Tracing and Evaluation Platform.",
   "packageManager": "[email protected]",
   "files": [

js/src/index.ts

@@ -18,4 +18,4 @@ export { RunTree, type RunTreeConfig } from "./run_trees.js";
 export { overrideFetchImplementation } from "./singletons/fetch.js";
 
 // Update using yarn bump-version
-export const __version__ = "0.3.2";
+export const __version__ = "0.3.3";

js/src/tests/jestlike/jest.test.ts

@@ -3,6 +3,7 @@ import { AsyncLocalStorage } from "node:async_hooks";
 
 import * as ls from "../../jest/index.js";
 import { type SimpleEvaluator } from "../../jest/index.js";
+import { objectHash } from "../../utils/jestlike/index.js";
 
 const myEvaluator: SimpleEvaluator = (params) => {
   const { referenceOutputs, outputs } = params;
@@ -253,3 +254,13 @@ ls.describe("Test Linkedin Post", () => {
     }
   );
 });
+
+test("object hash should work on undefined values", async () => {
+  expect(
+    objectHash({
+      foo: "bar",
+      baz: undefined,
+      qux: null,
+    })
+  ).toEqual("88d67a35803b03a787d9fce25ebed027807c68ce0c3dee9f818fc58a43dd10af");
+});

js/src/utils/jestlike/index.ts

@@ -96,41 +96,42 @@ export function logOutputs(output: Record<string, unknown>) {
   context.setLoggedOutput(output);
 }
 
+export function objectHash(obj: KVMap, depth = 0): string {
+  // Prevent infinite recursion
+  if (depth > 50) {
+    throw new Error(
+      "Object is too deep to check equality for serialization. Please use a simpler example."
+    );
+  }
+
+  if (Array.isArray(obj)) {
+    const arrayHash = obj.map((item) => objectHash(item, depth + 1)).join(",");
+    return crypto.createHash("sha256").update(arrayHash).digest("hex");
+  }
+
+  if (obj && typeof obj === "object") {
+    const sortedHash = Object.keys(obj)
+      .sort()
+      .map((key) => `${key}:${objectHash(obj[key], depth + 1)}`)
+      .join(",");
+    return crypto.createHash("sha256").update(sortedHash).digest("hex");
+  }
+
+  return (
+    crypto
+      .createHash("sha256")
+      // Treat null and undefined as equal for serialization purposes
+      .update(JSON.stringify(obj ?? null))
+      .digest("hex")
+  );
+}
+
 export function generateWrapperFromJestlikeMethods(
   methods: Record<string, any>,
   testRunnerName: string
 ) {
   const { expect, test, describe, beforeAll, afterAll } = methods;
 
-  const objectHash = (obj: KVMap, depth = 0): string => {
-    // Prevent infinite recursion
-    if (depth > 50) {
-      throw new Error(
-        "Object is too deep to check equality for serialization. Please use a simpler example."
-      );
-    }
-
-    if (Array.isArray(obj)) {
-      const arrayHash = obj
-        .map((item) => objectHash(item, depth + 1))
-        .join(",");
-      return crypto.createHash("sha256").update(arrayHash).digest("hex");
-    }
-
-    if (obj && typeof obj === "object") {
-      const sortedHash = Object.keys(obj)
-        .sort()
-        .map((key) => `${key}:${objectHash(obj[key], depth + 1)}`)
-        .join(",");
-      return crypto.createHash("sha256").update(sortedHash).digest("hex");
-    }
-
-    return crypto
-      .createHash("sha256")
-      .update(JSON.stringify(obj))
-      .digest("hex");
-  };
-
   async function _createProject(
     client: Client,
     datasetId: string,