[typescript-fetch] Make instanceOf infer type and check for undefineds #18694
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Fixes #18059
instanceOf
check infer the type of the parameterundefined
check for required fields ininstanceOf
Prior to this fix, doing a fetch and then a
toJSON
on that fetched model would return unexpected results inoneOf
models without a discriminator, as theoneOf
model spreads all possible values resulting in keys for each of theoneOf
types existing, but being undefined. Thus thetoJSON
would returntrue
forinstanceOf
the firstoneOf
type despite the required fields being undefined.Per instructions, tagging Typescript technical committee members:
@TiFu @taxpon @sebastianhaas @kenisteward @Vrolijkx @macjohnny @topce @akehir @petejohansonxo @amakhrov @davidgamero @mkusaka
First time contributor, please let me know if I made any blunders or if any additional info needed.
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