fix(runtime): unwrap Proxy receivers and arguments before native dispatch - #485
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Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 1 remain after this review. 📝 WalkthroughWalkthroughThe runtime unwraps proxies during native value conversion, receiver dispatch, wrapper lookup, and native counterpart release. It adds fallback context lookup for objects and callbacks. Tests cover proxied native receivers and arguments, revoked proxies, invalid targets, callback results, and proxy traps. ChangesProxy Runtime Handling
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant JavaScriptCaller
participant MethodCallback
participant ResolveProxyReceiver
participant NativeMethod
JavaScriptCaller->>MethodCallback: invoke method through proxy
MethodCallback->>ResolveProxyReceiver: resolve receiver
ResolveProxyReceiver-->>MethodCallback: return target or throw TypeError
MethodCallback->>NativeMethod: invoke with resolved receiver
Suggested reviewers: Merge Risk: ⚪ Minimal · up to The reviewed changes have no established behavior that blocks merging; normal project checks remain appropriate. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Native object validation remains intact, but the new revoked-proxy recovery behavior can leave large callback results incompletely initialized. This creates a data-integrity and possible stale-data exposure risk within the application process. Some callback exception paths remain insufficiently established. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 5 files. (3 skipped: 3 unsupported.)
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🛠️ Fix failing CI checks 💡
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October 5, 2026 18:59
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Inline comments:
Review comments at @NativeScript/runtime/MetadataBuilder.mm:
- Around line 806-811: Update ResolveProxyReceiver so allowClass does not accept
every function target: accept a function only when GetValue resolves it to an
ObjCClass wrapper. Preserve validation for native object and alloc-object
wrappers, and reject other targets with the existing “not a native object”
TypeError.
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NativeScript/runtime/AnimationFrame.mmNativeScript/runtime/ArgConverter.mmNativeScript/runtime/Helpers.hNativeScript/runtime/Helpers.mmNativeScript/runtime/Interop.mmNativeScript/runtime/MetadataBuilder.mmNativeScript/runtime/Reference.cppNativeScript/runtime/Timers.cppTestRunner/app/tests/ProxyReceiverTests.jsTestRunner/app/tests/index.js
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- NativeScript/runtime/Reference.cpp
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…atch Native wrappers wrapped in a JS Proxy (e.g. by Vue's reactive()) expose no internal fields, so method calls were dispatched as class methods, property accessors returned undefined, toString returned an object, and passing a proxy as an argument aborted the process in GetCreationContext. - tns::UnwrapProxy walks Proxy::GetTarget chains; tns::GetValue resolves through it, so every wrapper lookup sees the target. - MethodCallback, property getter/setter and toString resolve a proxy receiver to its native target (or class constructor for methods) and throw a TypeError for revoked proxies or non-native targets. - WriteValue/WriteTypeValue/ToArray unwrap before marshalling and throw a TypeError for revoked proxies; ToObject and callback return values treat a revoked proxy as nil. - GetCreationContext call sites fall back to the current context instead of asserting when the object has none.
…eValue GetValue resolves through proxies while SetValue and DeleteValue addressed the object they were handed, so __releaseNativeCounterpart(proxy) deleted the target's wrapper and then cleared the slot on the Proxy, leaving the target's internal field dangling. All three now resolve to the same target. ResolveProxyReceiver accepts a function target only when it carries an ObjCClass wrapper; a proxied plain function is a TypeError instead of a static call on the metadata class.
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @NativeScript/runtime/ArgConverter.mm:
- Line 457: Update the empty-value branch in SetValue after UnwrapProxy so it
clears the full ABI return size for struct-valued returns, matching the
callback-failure handling in MethodCallback rather than clearing only one
ffi_arg.
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NativeScript/runtime/AnimationFrame.mmNativeScript/runtime/ArgConverter.mmNativeScript/runtime/Helpers.hNativeScript/runtime/Helpers.mmNativeScript/runtime/Interop.mmNativeScript/runtime/MetadataBuilder.mmNativeScript/runtime/ObjectManager.mmTestRunner/app/tests/ProxyReceiverTests.js
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ArgConverter::SetValue wrote a single ffi_arg when a JS callback returned null, undefined or a revoked Proxy, so struct-valued returns handed native code stale bytes past the first word. Callers now pass cif->rtype->size and the empty branch clears the full slot.
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Description
Native object wrappers wrapped in a JS
Proxy— which is what Vue 3'sreactive()does to anything stored in componentdata()— expose no internal fields, so the runtime could not find the native object behind them:proxy.someMethod()NSInvalidArgumentException: +[Klass someMethod]: unrecognized selector sent to classproxy.somePropertyundefinedString(proxy)/console.logTypeError: Cannot convert object to primitive valuensArray.addObject(proxy)tns::AssertinInterop::ToArray— a Proxy has no creation context)The same behavior exists on every previous release (the gates are identical in 8.9.2), so this is not a 9.1 regression; Vue 3 users have been working around it with
markRaw/toRaw.Changes
tns::UnwrapProxywalksProxy::GetTarget()chains (empty when revoked).tns::GetValueresolves through it, so every wrapper lookup sees the target.MethodCallback, property getter/setter andtoStringresolve a Proxy receiver to its native target (or class constructor, for methods) and dispatch exactly as on the target. A revoked Proxy, or one whose target is not a native object, throws a catchableTypeErrorinstead of a static call or an assert.WriteValue/WriteTypeValue/ToArrayunwrap arguments before marshalling, so proxied native objects, proxied JS arrays of native objects, proxied dictionaries and struct initializers all convert as their targets do. A revoked Proxy argument throws aTypeError.ToObjectand ffi-closure return values (where a C++ throw can't propagate) treat a revoked Proxy asnil.GetCreationContext()on a caller-supplied value falls back to the current context instead of asserting (incl.setTimeout/requestAnimationFramecallbacks that are callable Proxies).Proxy traps are consulted only for the JS-side lookup; the native call runs on the target (no reactivity tracking of native state — expected, same as Vue's own guidance for third-party class instances).
Related Pull Requests
Tests
TestRunner/app/tests/ProxyReceiverTests.js— 14 specs (instance/nested/class-constructor receivers, property get/set, string coercion, proxied object/array/dictionary/struct arguments, revoked-proxy receiver and argument, non-native target, traps-are-consulted). Full suite: 1748 specs, 0 failures.Shared-submodule versions of these specs can follow once both runtimes land.
Summary by CodeRabbit
TypeError.