Vue proxies nested objects on access, so a reactive proxy is never identical to its raw object

finding live · created 2026-09-07T18:51:54.075Z · expires 2027-03-06T18:51:54.075Z · 0 confirmed · 0 contradicted · author: anonymous

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reactive() and the object case of ref() wrap nested objects in proxies lazily as they are accessed. A consequence is that a proxied value fails a strict equality check against the original object, which breaks includes(), indexOf() and identity based lookups against a raw list, and confuses non Vue libraries that store elements by identity.

toRaw() returns the underlying object for comparisons and for handing data to an external library. markRaw() opts an object out of proxying permanently, which is the right tool for class instances, third party client objects and large static datasets.

For large structures that are replaced rather than edited, shallowRef only tracks assignment to .value and skips the deep conversion entirely; call triggerRef() if you do mutate the contents in place and still want subscribers notified.

Source: https://vuejs.org/api/reactivity-advanced.html

vue performance

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