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…ion.prototype prototypeForStructure returns the [[Prototype]] of the constructor function. Both bindings returned objectPrototype(), so Bun.Cookie.bind, .call and .apply were undefined, Bun.Cookie instanceof Function was false, and String(Bun.Cookie) was "[object Function]". A subclass inherited the same chain. Return functionPrototype(), as every other JSDOMConstructor binding does, and include FunctionPrototype.h for the pointer conversion.
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WalkthroughChangesCookie constructor prototype alignment
Suggested reviewers: Priority: ⬇️ Low Merge Risk: 🔵 Low · up to The constructor behavior is covered, but the new parameterized test does not follow the repository’s required test structure. Update it before merging. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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In `@test/js/bun/cookie/cookie-map.test.ts`:
- Line 349: Replace the parameterized test declaration around the constructors
with describe.each(constructors), then place the existing inheritance assertion
inside a nested test while preserving the name and Constructor parameters and
test behavior.
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src/jsc/bindings/webcore/JSCookie.cppsrc/jsc/bindings/webcore/JSCookieMap.cpptest/js/bun/cookie/cookie-map.test.ts
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LGTM — a two-line swap to the established functionPrototype() pattern, with tests.
What was reviewed:
- Both
prototypeForStructureedits match the pattern already used by the other DOM constructors insrc/jsc/bindings/webcore/; grep confirms no remainingprototypeForStructuresite returnsobjectPrototype(). - The new
<JavaScriptCore/FunctionPrototype.h>include is placed in the existing alphabetical<JavaScriptCore/...>block in both files. - New tests live in the existing
cookie-map.test.ts, cover both constructors viatest.each, and exercise the prototype chain, subclass inheritance,String(Constructor), andbind-then-new— all of which fail on the pre-fix chain.
Extended reasoning...
Overview
The PR changes two template specializations — JSCookieDOMConstructor::prototypeForStructure in src/jsc/bindings/webcore/JSCookie.cpp and JSCookieMapDOMConstructor::prototypeForStructure in src/jsc/bindings/webcore/JSCookieMap.cpp — to return globalObject.functionPrototype() instead of globalObject.objectPrototype(), and adds the <JavaScriptCore/FunctionPrototype.h> include each file needs for the FunctionPrototype* → JSValue conversion. Four new tests are appended to test/js/bun/cookie/cookie-map.test.ts.
Security risks
None. This only adjusts the [[Prototype]] of two constructor function objects to Function.prototype, matching every other WebCore-style constructor in the tree. It does not touch instance prototypes, validation, I/O, auth, or any user-input parsing path.
Level of scrutiny
Low. The edit is a one-token substitution per file that brings two outliers in line with the dominant pattern (the other prototypeForStructure specializations already return functionPrototype() or a parent constructor). A grep over src/jsc/bindings confirms no prototypeForStructure site still returns objectPrototype(), satisfying the "fix the whole class" rule for this pattern. The two related-but-different-cause sites (JSWrappingFunction, Bun.$) are explicitly named and tracked in the PR description, which is exactly what REVIEW.md asks for when a sibling is intentionally excluded.
Other factors
Tests are added to the existing feature test file (not a new regression file), use test.each for the constructor matrix, group related checks with .toEqual, and assert observable behavior that is directly tied to the prototype chain (Object.getPrototypeOf, instanceof Function, bind/call/apply identity, String(Constructor), subclass inheritance, and new (Constructor.bind(...))) — all of which necessarily fail when the constructor's prototype is Object.prototype. No CODEOWNERS entries cover the changed paths, the timeline has no outstanding reviewer objections, and the bug hunt exited on dry_streak with no findings.
Problem
Bun.CookieandBun.CookieMaphaveObject.prototypeas the [[Prototype]] of the constructor function. SoBun.Cookie.bind,.calland.applyareundefined,Bun.Cookie instanceof Functionisfalse, andString(Bun.Cookie)is"[object Function]". A subclass (class X extends Bun.Cookie {}) inherits the same chain.JSCookieDOMConstructor::prototypeForStructure(src/jsc/bindings/webcore/JSCookie.cpp:387) andJSCookieMapDOMConstructor::prototypeForStructure(src/jsc/bindings/webcore/JSCookieMap.cpp:210). Both returnglobalObject.objectPrototype().Fix
globalObject.functionPrototype(). Both files include<JavaScriptCore/FunctionPrototype.h>, which theFunctionPrototype*toJSValueconversion needs.getDOMConstructor(JSDOMGlobalObjectInlines.h:40) passes this value tocreateStructureas the prototype of the constructor. Of the 51prototypeForStructuredefinitions, 38 now returnfunctionPrototype(), 13 return a parent constructor, and none returnsobjectPrototype(). Instances do not change.expect.extend()matchers (bun:test: a matcher fromexpect.extend()does not inherit fromFunction.prototype#42611) and onBun.$(Bun.$andnew $.Shell()do not inherit fromFunction.prototype#42612). They have other causes, and this PR does not change them.test/js/bun/cookie/cookie-map.test.ts(4 new tests, all fail on 1.4.3-canary.1). Also all oftest/js/bun/cookie/,test/js/bun/util/cookie.test.jsandtest/js/bun/http/bun-serve-cookies.test.ts.Background
JSDOMConstructor<T>is the native constructor function of a WebCore-style class. Each class definesprototypeForStructure. It gives the [[Prototype]] of the constructor function itself:Function.prototypefor a base class, the parent constructor for a derived class (EventforMessageEvent).JSCookiePrototype).createPrototypebuilds it onObject.prototype. This PR does not touch it.constructfunctions in the same two files. The hunks do not overlap. A trial merge of the two branches is clean.Notes
Before and after, release 1.4.3-canary.1 against the debug build of this branch:
Object.getPrototypeOf(Bun.Cookie) === Function.prototypefalsetruetypeof Bun.Cookie.bind"undefined""function"Bun.Cookie instanceof FunctionfalsetrueString(Bun.Cookie)"[object Function]""function Cookie() { [native code] }"util.inspect(Bun.CookieMap)[Function: CookieMap] Object[Function: CookieMap]Bun.Cookie.call(null, "a", "b")TypeError: Bun.Cookie.call is not a functionTypeError [ERR_ILLEGAL_CONSTRUCTOR]: Use new Cookie(...)Bun.Cookie.callerundefinedTypeError: 'arguments', 'callee', and 'caller' cannot be accessed in this context.Bun.CookieMapgives the same results.URL,HeadersandURLPatternalready give the "after" column, the.callerrow included.Not changed:
Object.getOwnPropertyNamesof both constructors,name,length,Bun.Cookie.parse,Bun.Cookie.from,Reflect.construct, and the prototype chain of instances (Object.getPrototypeOf(Bun.Cookie.prototype) === Object.prototype).The include is necessary. Without it the build fails:
no viable conversion from returned value of type 'FunctionPrototype *' to function return type 'JSValue', becauseFunctionPrototypeis only forward-declared in these two files. 19 other files insrc/jsc/bindings/webcore/include the same header for the same reason.Not changed here. Two other callables show the same four symptoms on this branch. They are not
prototypeForStructuresites. Each has a tracker:expect.extend()does not inherit fromFunction.prototype#42611: each matcher thatexpect.extend()installs.JSWrappingFunction::create(src/jsc/bindings/JSWrappingFunction.cpp:37) builds the structure of aJSFunctionsubclass withobjectPrototype(). The same line creates a newStructurefor each matcher, so the fix there should also cache the structure on the global object. Remove dead code from the JSC, WebCore, and node bindings, uWS/uSockets, SecretsLinux, and seven Rust crates #42431 (open) edits the two adjacent lines.Bun.$andnew $.Shell()do not inherit fromFunction.prototype#42612:Bun.$andnew $.Shell().src/js/builtins/shell.ts:356sets the prototype of the function toShellPrototype.prototype, which inherits fromObject.prototype. The cause is in JS, in another subsystem, and Honor newTarget in Bun.Cookie, Bun.CookieMap, crypto.ECDH, crypto.DiffieHellman, dns.Resolver, $.Shell, HTTPParser and ConnectionsList #42528 edits the same file.How they were found: a script walked the own value properties of
globalThis,Bunand 34node:andbun:modules (depth 2). It listed each function whose prototype chain does not reachFunction.prototype:Bun.Cookie,Bun.CookieMapandBun.$. That walk cannot see a function that exists only after a call, such as anexpect.extend()matcher. The self-review found that one.Self-review concerns: three asked for a narrower claim in this description, with both sites named and tracked (done above). Two asked to keep
JSWrappingFunction.cppout of this diff (done: it is not in the diff).Suites run with the debug (ASAN) build:
test/js/bun/cookie/(5 files),test/js/bun/util/cookie.test.js,test/js/bun/http/bun-serve-cookies.test.ts,test/regression/issue/22475.test.ts,test/regression/issue/isArray-proxy-crash.test.ts,test/js/bun/jsc/common-strings.test.ts: 303 pass, 18 skip, 0 fail.[auto-merge] gate passed · iteration 0 · 3 files touched
fails on main (without fix)
passes on PR (with fix)
diff hotspot
gate history · 1 passed · 0 rejected · iteration 0
evidence per changed file