JS Proxy, where have you been
summary
JS Proxy appears as a wrapper around an object that intercepts get/set/delete operations and lets code enforce behavior. Examples demonstrate a read-only object that denies sets and throws, an input validation handler that rejects wrong types, and a debugging proxy that logs every access so mutated properties and call order are visible. Notes call out an order of magnitude performance cost vs plain objects, no primitive targets, and no Internet Explorer support.
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