102 lines
2.8 KiB
JavaScript
102 lines
2.8 KiB
JavaScript
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/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @flow
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*/
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'use strict';
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let logListeners;
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type LogListeners = {|
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+onDifferentFunctionsIgnored: (nameOne: ?string, nameTwo: ?string) => void,
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|};
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type Options = {|+unsafelyIgnoreFunctions?: boolean|};
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function unstable_setLogListeners(listeners: ?LogListeners) {
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logListeners = listeners;
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}
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/*
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* @returns {bool} true if different, false if equal
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*/
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const deepDiffer = function(
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one: any,
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two: any,
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maxDepthOrOptions: Options | number = -1,
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maybeOptions?: Options,
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): boolean {
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const options =
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typeof maxDepthOrOptions === 'number' ? maybeOptions : maxDepthOrOptions;
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const maxDepth =
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typeof maxDepthOrOptions === 'number' ? maxDepthOrOptions : -1;
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if (maxDepth === 0) {
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return true;
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}
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if (one === two) {
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// Short circuit on identical object references instead of traversing them.
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return false;
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}
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if (typeof one === 'function' && typeof two === 'function') {
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// We consider all functions equal unless explicitly configured otherwise
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let unsafelyIgnoreFunctions = options?.unsafelyIgnoreFunctions;
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if (unsafelyIgnoreFunctions == null) {
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if (
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logListeners &&
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logListeners.onDifferentFunctionsIgnored &&
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(!options || !('unsafelyIgnoreFunctions' in options))
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) {
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logListeners.onDifferentFunctionsIgnored(one.name, two.name);
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}
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unsafelyIgnoreFunctions = true;
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}
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return !unsafelyIgnoreFunctions;
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}
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if (typeof one !== 'object' || one === null) {
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// Primitives can be directly compared
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return one !== two;
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}
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if (typeof two !== 'object' || two === null) {
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// We know they are different because the previous case would have triggered
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// otherwise.
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return true;
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}
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if (one.constructor !== two.constructor) {
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return true;
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}
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if (Array.isArray(one)) {
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// We know two is also an array because the constructors are equal
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const len = one.length;
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if (two.length !== len) {
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return true;
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}
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for (let ii = 0; ii < len; ii++) {
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if (deepDiffer(one[ii], two[ii], maxDepth - 1, options)) {
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return true;
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}
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}
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} else {
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for (const key in one) {
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if (deepDiffer(one[key], two[key], maxDepth - 1, options)) {
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return true;
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}
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}
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for (const twoKey in two) {
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// The only case we haven't checked yet is keys that are in two but aren't
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// in one, which means they are different.
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if (one[twoKey] === undefined && two[twoKey] !== undefined) {
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return true;
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}
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}
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}
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return false;
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};
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module.exports = deepDiffer;
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module.exports.unstable_setLogListeners = unstable_setLogListeners;
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