55 lines
1.5 KiB
JavaScript
55 lines
1.5 KiB
JavaScript
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import _typeof from "@babel/runtime/helpers/esm/typeof";
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import warning from "./warning";
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/**
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* Deeply compares two object literals.
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* @param obj1 object 1
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* @param obj2 object 2
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* @param shallow shallow compare
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* @returns
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*/
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function isEqual(obj1, obj2) {
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var shallow = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
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// https://github.com/mapbox/mapbox-gl-js/pull/5979/files#diff-fde7145050c47cc3a306856efd5f9c3016e86e859de9afbd02c879be5067e58f
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var refSet = new Set();
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function deepEqual(a, b) {
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var level = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;
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var circular = refSet.has(a);
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warning(!circular, 'Warning: There may be circular references');
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if (circular) {
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return false;
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}
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if (a === b) {
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return true;
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}
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if (shallow && level > 1) {
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return false;
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}
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refSet.add(a);
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var newLevel = level + 1;
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if (Array.isArray(a)) {
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if (!Array.isArray(b) || a.length !== b.length) {
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return false;
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}
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for (var i = 0; i < a.length; i++) {
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if (!deepEqual(a[i], b[i], newLevel)) {
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return false;
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}
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}
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return true;
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}
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if (a && b && _typeof(a) === 'object' && _typeof(b) === 'object') {
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var keys = Object.keys(a);
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if (keys.length !== Object.keys(b).length) {
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return false;
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}
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return keys.every(function (key) {
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return deepEqual(a[key], b[key], newLevel);
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});
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}
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// other
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return false;
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}
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return deepEqual(obj1, obj2);
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}
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export default isEqual;
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