Bump WebKit: reject non-ASCII identity escapes in unicode RegExp patterns

scripts/build/deps/webkit.ts

@@ -3,7 +3,7 @@
  * for local mode. Override via `--webkit-version=<hash>` to test a branch.
  * From https://github.com/oven-sh/WebKit releases.
  */
-export const WEBKIT_VERSION = "c4ddc0cf5255ec9cc209e6369292739b78e3ca80";
+export const WEBKIT_VERSION = "autobuild-preview-pr-517-f390a25a";
 
 /**
  * WebKit (JavaScriptCore) — the JS engine.

test/js/bun/jsc/webkit-upgrade-f390a25a.test.ts

@@ -0,0 +1,37 @@
+import { describe, expect, test } from "bun:test";
+
+// Coverage for the WebKit f390a25a sync (oven-sh/WebKit#517): under the u and
+// v flags, an identity escape of a non-ASCII character must be a SyntaxError.
+// Yarr only validated ASCII escapes, so /\Ç/u compiled and matched with the
+// Annex B meaning. Fixes oven-sh/bun#40441.
+
+describe.concurrent("WebKit f390a25a upgrade", () => {
+  test("non-ASCII identity escapes throw under the u and v flags", () => {
+    expect(() => new RegExp("\\Ç", "u")).toThrow(SyntaxError);
+    expect(() => new RegExp("\\Ç", "v")).toThrow(SyntaxError);
+    expect(() => new RegExp("\\é", "u")).toThrow(SyntaxError);
+    expect(() => new RegExp("\\字", "u")).toThrow(SyntaxError);
+    expect(() => new RegExp("\\𝒳", "u")).toThrow(SyntaxError);
+    expect(() => new RegExp("\\𝒳", "v")).toThrow(SyntaxError);
+    expect(() => new RegExp("[\\Ç]", "u")).toThrow(SyntaxError);
+    expect(() => new RegExp("[\\Ç]", "v")).toThrow(SyntaxError);
+    expect(() => new RegExp("[\\q{\\Ç}]", "v")).toThrow(SyntaxError);
+  });
+
+  test("ASCII identity escapes keep their behavior", () => {
+    // Still invalid under u: not a SyntaxCharacter or '/'.
+    expect(() => new RegExp("\\q", "u")).toThrow(SyntaxError);
+    expect(() => new RegExp("\\\u0000", "u")).toThrow(SyntaxError);
+    // Still valid.
+    expect(new RegExp("\\$", "u").test("$")).toBe(true);
+    expect(new RegExp("\\/", "u").test("/")).toBe(true);
+    expect(new RegExp("[\\-]", "u").test("-")).toBe(true);
+    expect(new RegExp("[\\&]", "v").test("&")).toBe(true);
+  });
+
+  test("non-unicode patterns and escaped code points are unchanged", () => {
+    expect(new RegExp("\\Ç").test("Ç")).toBe(true);
+    expect(new RegExp("Ç", "u").test("Ç")).toBe(true);
+    expect(new RegExp("\\u00C7", "u").test("Ç")).toBe(true);
+  });
+});