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getOwnPropertyDescriptor _should_ return undefined in certain situations. This is documented here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/getOwnPropertyDescriptor This change addresses https://github.com/Microsoft/TypeScript/issues/14923 and https://github.com/Microsoft/TypeScript/issues/10904. The original fix to 14923 was to the /lib/lib.es2015.proxy.d.ts file instead of /src/lib/lib.es2015.proxy.d.ts (see: https://github.com/Microsoft/TypeScript/pull/10550/commits). I think this meant that the change got over-written by a generation script (see note here: https://github.com/Microsoft/TypeScript/tree/master/lib)