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fix: update isPlainObject method to account for 'constructor' key #24

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merged 1 commit into from
Dec 1, 2022
Merged

fix: update isPlainObject method to account for 'constructor' key #24

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3 changes: 2 additions & 1 deletion src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,8 @@ export function isNull(payload: any): payload is null {
*/
export function isPlainObject(payload: any): payload is PlainObject {
if (getType(payload) !== 'Object') return false
return payload.constructor === Object && Object.getPrototypeOf(payload) === Object.prototype
const prototype = Object.getPrototypeOf(payload)
return prototype.constructor === Object && prototype === Object.prototype
}

/**
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2 changes: 2 additions & 0 deletions test/index.test.ts
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Expand Up @@ -307,8 +307,10 @@ test('isObject vs isAnyObject', () => {
// plain object
expect(isObject({})).toEqual(true)
expect(isObject(new Object())).toEqual(true)
expect(isObject({ constructor: '123' })).toEqual(true)
expect(isPlainObject({})).toEqual(true)
expect(isPlainObject(new Object())).toEqual(true)
expect(isPlainObject({ constructor: '123' })).toEqual(true)
// classes & prototypes
expect(isObject(myClass)).toEqual(false)
expect(isObject(myClass2)).toEqual(false)
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