fix(animations): detect object trigger values with Object.hasOwn - #70149
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fix(animations): detect object trigger values with Object.hasOwn#70149arshsmith1 wants to merge 1 commit into
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JeanMeche
approved these changes
Aug 12, 2026
JeanMeche
approved these changes
Aug 16, 2026
StateValue and AnimationTransitionNamespace.trigger detect the {value,
params} object form of a trigger binding by calling hasOwnProperty on the
bound value. When that value is an object from untrusted data (for example
a parsed JSON payload) carrying an own hasOwnProperty key, the shadowed
property is called as a method and throws, breaking the animation flush.
Use Object.hasOwn for the check so a shadowing key no longer matters.
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PR Checklist
PR Type
What is the current behavior?
Issue Number: N/A
StateValue(andAnimationTransitionNamespace.trigger) figure out whether a trigger binding is in the{value, params}object form by callinginput.hasOwnProperty('value')on the bound value. When an app binds a trigger to an object that comes from untrusted data and happens to carry an ownhasOwnPropertykey, for example[@state]="JSON.parse('{\"value\":\"open\",\"hasOwnProperty\":\"x\"}')", that own property shadows the method, so the call throwsTypeError: input.hasOwnProperty is not a functionand the whole animation flush fails during change detection.What is the new behavior?
Both checks use
Object.hasOwn(value, 'value'), which does not go through the value's own members, so a shadowing key no longer matters. Primitive values and normal{value, params}objects are detected exactly as before.Does this PR introduce a breaking change?
Other information
The added spec fails on
mainwith theTypeErrorand passes with this change.