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Avoid unnecesary prototype loop #581

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Avoid unnecesary prototype loop #581

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13 changes: 5 additions & 8 deletions src/isPlainObject.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7,12 +7,9 @@
* @returns {boolean} True if the argument appears to be a plain object.
*/
export default function isPlainObject(value: unknown): value is object {
if (typeof value !== 'object' || value === null) return false

let proto = value
while (Object.getPrototypeOf(proto) !== null) {
proto = Object.getPrototypeOf(proto)
}

return Object.getPrototypeOf(value) === proto
return (
typeof value === 'object' &&
value !== null &&
Object.getPrototypeOf(Object.getPrototypeOf(value) || 0) === null
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@WebReflection WebReflection May 25, 2020 •
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P.S. the 0 could be just a literal {} instead, it'd work exactly the same (but it'd be 1 extra char).

)
}