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Dawid Dziurla
24 lines
1.1 KiB
TypeScript
24 lines
1.1 KiB
TypeScript
/**
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* Detects a key that can not be copied onto a plain object with `target[key] = value`.
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*
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* "__proto__" is the only one: assigning it runs the inherited setter and replaces the
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* prototype of the target instead of adding a property to it, so a caller can smuggle
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* values past validation that only inspects own keys. JSON.parse produces such a key
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* where an object literal can not. "constructor" and "prototype" have no such setter and
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* become ordinary own properties, so dropping them would only discard legitimate values.
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*
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* @param key Key to check
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* @returns true if the key must not be copied
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*/
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export declare const isProtoKey: (key: string) => boolean;
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/**
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* Copies own enumerable keys from a source object to a target object. Every copy that
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* walks the keys of user supplied data goes through here, see isProtoKey.
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*
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* @param target Object to copy the keys to
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* @param source Object to copy the keys from
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* @param [skip] Optional predicate, return true to leave a key out
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* @returns The target object
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*/
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export declare const copyOwnKeys: <T extends object>(target: T, source: object | null | undefined, skip?: (key: string) => boolean) => T;
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