diff --git a/scripts/lib/generated-file.mjs b/scripts/lib/generated-file.mjs
index e3af72793..d7df714c6 100644
--- a/scripts/lib/generated-file.mjs
+++ b/scripts/lib/generated-file.mjs
@@ -6,6 +6,13 @@ const isMissing = (cause) =>
   "code" in cause &&
   cause.code === "ENOENT";
 
+const normalizeLineEndings = (value) => value.replaceAll("\r\n", "\n");
+
+const preserveLineEndings = (source, existing) =>
+  existing?.includes("\r\n") === true
+    ? normalizeLineEndings(source).replaceAll("\n", "\r\n")
+    : source;
+
 /** Compare or update one generated text artifact with actionable diagnostics. */
 export const ensureGeneratedFile = async ({
   path,
@@ -19,11 +26,15 @@ export const ensureGeneratedFile = async ({
   } catch (cause) {
     if (!isMissing(cause)) throw cause;
   }
-  if (existing === source) return { changed: false };
+  if (
+    existing !== undefined &&
+    normalizeLineEndings(existing) === normalizeLineEndings(source)
+  )
+    return { changed: false };
   if (check)
     throw new Error(
       `${path} is missing or stale. Run \`${generateCommand}\` and commit the result.`,
     );
-  await writeFile(path, source, "utf8");
+  await writeFile(path, preserveLineEndings(source, existing), "utf8");
   return { changed: true };
 };
diff --git a/tests/productCatalog.test.ts b/tests/productCatalog.test.ts
index 78042b434..7f39ea40a 100644
--- a/tests/productCatalog.test.ts
+++ b/tests/productCatalog.test.ts
@@ -234,4 +234,29 @@ describe("canonical product catalog", () => {
     ).resolves.toEqual({ changed: true });
     expect(await readFile(path, "utf8")).toBe("current\n");
   });
+
+  it("accepts and preserves native generated-file line endings", async () => {
+    const directory = await mkdtemp(join(tmpdir(), "rea-generated-eol-"));
+    temporaryRoots.push(directory);
+    const path = join(directory, "catalog.json");
+    await writeFile(path, "current\r\n", "utf8");
+    await expect(
+      ensureGeneratedFile({
+        path,
+        source: "current\n",
+        check: true,
+        generateCommand: "npm run docs:generate",
+      }),
+    ).resolves.toEqual({ changed: false });
+    expect(await readFile(path, "utf8")).toBe("current\r\n");
+    await expect(
+      ensureGeneratedFile({
+        path,
+        source: "updated\n",
+        check: false,
+        generateCommand: "npm run docs:generate",
+      }),
+    ).resolves.toEqual({ changed: true });
+    expect(await readFile(path, "utf8")).toBe("updated\r\n");
+  });
 });