110 lines
2.4 KiB
TypeScript
110 lines
2.4 KiB
TypeScript
// From https://github.com/epoberezkin/fast-deep-equal
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// MIT License - Copyright (c) 2017 Evgeny Poberezkin
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export const deepEqual = (a: any, b: any): boolean => {
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if (a === b) {
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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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if (a.constructor !== b.constructor) {
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return false;
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}
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let i: number | [any, any];
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let length: number;
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if (Array.isArray(a)) {
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length = a.length;
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if (length !== b.length) {
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return false;
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}
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for (i = length; i-- !== 0; ) {
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if (!deepEqual(a[i], b[i])) {
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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 instanceof Map && b instanceof Map) {
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if (a.size !== b.size) {
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return false;
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}
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for (i of a.entries()) {
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if (!b.has(i[0])) {
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return false;
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}
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}
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for (i of a.entries()) {
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if (!deepEqual(i[1], b.get(i[0]))) {
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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 instanceof Set && b instanceof Set) {
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if (a.size !== b.size) {
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return false;
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}
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for (i of a.entries()) {
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if (!b.has(i[0])) {
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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 (ArrayBuffer.isView(a) && ArrayBuffer.isView(b)) {
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// eslint-disable-next-line
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// @ts-ignore
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length = a.length;
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// eslint-disable-next-line
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// @ts-ignore
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if (length !== b.length) {
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return false;
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}
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for (i = length; i-- !== 0; ) {
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if (a[i] !== b[i]) {
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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.constructor === RegExp) {
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return a.source === b.source && a.flags === b.flags;
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}
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if (a.valueOf !== Object.prototype.valueOf) {
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return a.valueOf() === b.valueOf();
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}
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if (a.toString !== Object.prototype.toString) {
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return a.toString() === b.toString();
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}
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const keys = Object.keys(a);
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length = keys.length;
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if (length !== Object.keys(b).length) {
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return false;
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}
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for (i = length; i-- !== 0; ) {
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if (!Object.prototype.hasOwnProperty.call(b, keys[i])) {
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return false;
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}
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}
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for (i = length; i-- !== 0; ) {
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const key = keys[i];
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if (!deepEqual(a[key], b[key])) {
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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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// true if both NaN, false otherwise
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// eslint-disable-next-line no-self-compare
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return a !== a && b !== b;
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};
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