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fix: object with hasOwnProperty key #15

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Merged
merged 1 commit into from
Oct 28, 2025
Merged

fix: object with hasOwnProperty key #15

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1 change: 1 addition & 0 deletions src/index.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@ const jsonValues = {
jsonObjectWithFlatPropertiesAndStringValues: { a: 'a', b: 'b', c: 'c' },
jsonObjectWithFlatPropertiesAndNumberValues: { a: 3, b: 2, c: 1 },
jsonObjectWithFlatPropertiesAndMixedValues: { a: true, b: 'b', c: 12 },
jsonObjectWithHasOwnProperty: { a: true, hasOwnProperty: null },
} as const;

describe('a generate json patch function', () => {
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12 changes: 8 additions & 4 deletions src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -204,12 +204,16 @@ export function generateJSONPatch(
} else {
compareObjects(newPath, leftValue, rightValue);
}
} else if (leftJsonValue.hasOwnProperty(rightKey)) {
} else if (
Object.prototype.hasOwnProperty.call(leftJsonValue, rightKey)
) {
patch.push({ op: 'replace', path: newPath, value: rightValue });
} else {
patch.push({ op: 'add', path: newPath, value: rightValue });
}
} else if (!leftJsonValue.hasOwnProperty(rightKey)) {
} else if (
!Object.prototype.hasOwnProperty.call(leftJsonValue, rightKey)
) {
patch.push({ op: 'add', path: newPath, value: rightValue });
} else if (leftValue !== rightValue) {
patch.push({ op: 'replace', path: newPath, value: rightValue });
Expand All @@ -218,12 +222,12 @@ export function generateJSONPatch(

for (const leftKey in leftJsonValue) {
if (
!leftJsonValue.hasOwnProperty(leftKey) ||
!Object.prototype.hasOwnProperty.call(leftJsonValue, leftKey) ||
(hasPropertyFilter && !propertyFilter(leftKey, { side: 'left', path }))
)
continue;

if (!rightJsonValue.hasOwnProperty(leftKey)) {
if (!Object.prototype.hasOwnProperty.call(rightJsonValue, leftKey)) {
let newPath =
isArrayAtTop && path === '' ? `/${leftKey}` : `${path}/${leftKey}`;
patch.push({ op: 'remove', path: newPath });
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