bc518174
 王天杨
提交两个项目文件
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/* global Map:readonly, Set:readonly, ArrayBuffer:readonly */
var hasElementType = typeof Element !== 'undefined';
var hasMap = typeof Map === 'function';
var hasSet = typeof Set === 'function';
var hasArrayBuffer = typeof ArrayBuffer === 'function' && !!ArrayBuffer.isView;
// Note: We **don't** need `envHasBigInt64Array` in fde es6/index.js
function equal(a, b) {
// START: fast-deep-equal es6/index.js 3.1.3
if (a === b) return true;
if (a && b && typeof a == 'object' && typeof b == 'object') {
if (a.constructor !== b.constructor) return false;
var length, i, keys;
if (Array.isArray(a)) {
length = a.length;
if (length != b.length) return false;
for (i = length; i-- !== 0;)
if (!equal(a[i], b[i])) return false;
return true;
}
// START: Modifications:
// 1. Extra `has<Type> &&` helpers in initial condition allow es6 code
// to co-exist with es5.
// 2. Replace `for of` with es5 compliant iteration using `for`.
// Basically, take:
//
// ```js
// for (i of a.entries())
// if (!b.has(i[0])) return false;
// ```
//
// ... and convert to:
//
// ```js
// it = a.entries();
// while (!(i = it.next()).done)
// if (!b.has(i.value[0])) return false;
// ```
//
// **Note**: `i` access switches to `i.value`.
var it;
if (hasMap && (a instanceof Map) && (b instanceof Map)) {
if (a.size !== b.size) return false;
it = a.entries();
while (!(i = it.next()).done)
if (!b.has(i.value[0])) return false;
it = a.entries();
while (!(i = it.next()).done)
if (!equal(i.value[1], b.get(i.value[0]))) return false;
return true;
}
if (hasSet && (a instanceof Set) && (b instanceof Set)) {
if (a.size !== b.size) return false;
it = a.entries();
while (!(i = it.next()).done)
if (!b.has(i.value[0])) return false;
return true;
}
// END: Modifications
if (hasArrayBuffer && ArrayBuffer.isView(a) && ArrayBuffer.isView(b)) {
length = a.length;
if (length != b.length) return false;
for (i = length; i-- !== 0;)
if (a[i] !== b[i]) return false;
return true;
}
if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;
// START: Modifications:
// Apply guards for `Object.create(null)` handling. See:
// - https://github.com/FormidableLabs/react-fast-compare/issues/64
// - https://github.com/epoberezkin/fast-deep-equal/issues/49
if (a.valueOf !== Object.prototype.valueOf && typeof a.valueOf === 'function' && typeof b.valueOf === 'function') return a.valueOf() === b.valueOf();
if (a.toString !== Object.prototype.toString && typeof a.toString === 'function' && typeof b.toString === 'function') return a.toString() === b.toString();
// END: Modifications
keys = Object.keys(a);
length = keys.length;
if (length !== Object.keys(b).length) return false;
for (i = length; i-- !== 0;)
if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;
// END: fast-deep-equal
// START: react-fast-compare
// custom handling for DOM elements
if (hasElementType && a instanceof Element) return false;
// custom handling for React/Preact
for (i = length; i-- !== 0;) {
if ((keys[i] === '_owner' || keys[i] === '__v' || keys[i] === '__o') && a.$$typeof) {
// React-specific: avoid traversing React elements' _owner
// Preact-specific: avoid traversing Preact elements' __v and __o
// __v = $_original / $_vnode
// __o = $_owner
// These properties contain circular references and are not needed when
// comparing the actual elements (and not their owners)
// .$$typeof and ._store on just reasonable markers of elements
continue;
}
// all other properties should be traversed as usual
if (!equal(a[keys[i]], b[keys[i]])) return false;
}
// END: react-fast-compare
// START: fast-deep-equal
return true;
}
return a !== a && b !== b;
}
// end fast-deep-equal
module.exports = function isEqual(a, b) {
try {
return equal(a, b);
} catch (error) {
if (((error.message || '').match(/stack|recursion/i))) {
// warn on circular references, don't crash
// browsers give this different errors name and messages:
// chrome/safari: "RangeError", "Maximum call stack size exceeded"
// firefox: "InternalError", too much recursion"
// edge: "Error", "Out of stack space"
console.warn('react-fast-compare cannot handle circular refs');
return false;
}
// some other error. we should definitely know about these
throw error;
}
};
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