feat(core-shared): add slugifyIfMissing hook

packages/core-shared/src/payload/hooks/slugify-if-missing.test.ts

@@ -0,0 +1,44 @@
+import { describe, expect, it } from "vitest";
+import { slugifyIfMissing } from "./slugify-if-missing";
+
+describe("slugifyIfMissing", () => {
+  it("derives slug from title on create when slug is empty", () => {
+    const result = slugifyIfMissing({
+      data: { title: "Hello World" },
+      operation: "create",
+    });
+    expect(result?.slug).toBe("hello-world");
+  });
+
+  it("does not overwrite an existing slug", () => {
+    const result = slugifyIfMissing({
+      data: { title: "New Title", slug: "kept-slug" },
+      operation: "create",
+    });
+    expect(result?.slug).toBe("kept-slug");
+  });
+
+  it("does nothing on update", () => {
+    const result = slugifyIfMissing({
+      data: { title: "Hello World" },
+      operation: "update",
+    });
+    expect(result?.slug).toBeUndefined();
+  });
+
+  it("strips non-alphanumerics and trims hyphens", () => {
+    const result = slugifyIfMissing({
+      data: { title: "  Hello, World!! 2026  " },
+      operation: "create",
+    });
+    expect(result?.slug).toBe("hello-world-2026");
+  });
+
+  it("returns data unchanged when title is missing", () => {
+    const result = slugifyIfMissing({
+      data: {},
+      operation: "create",
+    });
+    expect(result?.slug).toBeUndefined();
+  });
+});

packages/core-shared/src/payload/hooks/slugify-if-missing.ts

@@ -0,0 +1,19 @@
+export function slugifyIfMissing({
+  data,
+  operation,
+}: {
+  data?: { title?: string; slug?: string };
+  operation?: string;
+}) {
+  if (!data) return data;
+  if (operation !== "create") return data;
+  if (data.slug) return data;
+  if (!data.title) return data;
+
+  data.slug = data.title
+    .toLowerCase()
+    .replace(/[^a-z0-9]+/g, "-")
+    .replace(/^-+|-+$/g, "");
+
+  return data;
+}