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8c741f6 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 | 'use strict';
const Reach = require('./reach');
const Types = require('./types');
const Utils = require('./utils');
const internals = {
needsProtoHack: new Set([Types.set, Types.map, Types.weakSet, Types.weakMap]),
structuredCloneExists: typeof structuredClone === 'function'
};
module.exports = internals.clone = function (obj, options = {}, _seen = null) {
if (typeof obj !== 'object' ||
obj === null) {
return obj;
}
let clone = internals.clone;
let seen = _seen;
if (options.shallow) {
if (options.shallow !== true) {
return internals.cloneWithShallow(obj, options);
}
clone = (value) => value;
}
else if (seen) {
const lookup = seen.get(obj);
if (lookup) {
return lookup;
}
}
else {
seen = new Map();
}
// Built-in object types
const baseProto = Types.getInternalProto(obj);
switch (baseProto) {
case Types.buffer:
return Buffer?.from(obj);
case Types.date:
return new Date(obj.getTime());
case Types.regex:
case Types.url:
return new baseProto.constructor(obj);
}
// Generic objects
const newObj = internals.base(obj, baseProto, options);
if (newObj === obj) {
return obj;
}
if (seen) {
seen.set(obj, newObj); // Set seen, since obj could recurse
}
if (baseProto === Types.set) {
for (const value of obj) {
newObj.add(clone(value, options, seen));
}
}
else if (baseProto === Types.map) {
for (const [key, value] of obj) {
newObj.set(key, clone(value, options, seen));
}
}
const keys = Utils.keys(obj, options);
for (const key of keys) {
if (key === '__proto__') {
continue;
}
if (baseProto === Types.array &&
key === 'length') {
newObj.length = obj.length;
continue;
}
// Can only be covered in node 21+
/* $lab:coverage:off$ */
if (internals.structuredCloneExists &&
baseProto === Types.error &&
key === 'stack') {
continue; // Already a part of the base object
}
/* $lab:coverage:on$ */
const descriptor = Object.getOwnPropertyDescriptor(obj, key);
if (descriptor) {
if (descriptor.get ||
descriptor.set) {
Object.defineProperty(newObj, key, descriptor);
}
else if (descriptor.enumerable) {
newObj[key] = clone(obj[key], options, seen);
}
else {
Object.defineProperty(newObj, key, { enumerable: false, writable: true, configurable: true, value: clone(obj[key], options, seen) });
}
}
else {
Object.defineProperty(newObj, key, {
enumerable: true,
writable: true,
configurable: true,
value: clone(obj[key], options, seen)
});
}
}
return newObj;
};
internals.cloneWithShallow = function (source, options) {
const keys = options.shallow;
options = Object.assign({}, options);
options.shallow = false;
const seen = new Map();
for (const key of keys) {
const ref = Reach(source, key);
if (typeof ref === 'object' ||
typeof ref === 'function') {
seen.set(ref, ref);
}
}
return internals.clone(source, options, seen);
};
internals.base = function (obj, baseProto, options) {
if (options.prototype === false) { // Defaults to true
if (internals.needsProtoHack.has(baseProto)) {
return new baseProto.constructor();
}
return baseProto === Types.array ? [] : {};
}
const proto = Object.getPrototypeOf(obj);
if (proto &&
proto.isImmutable) {
return obj;
}
if (baseProto === Types.array) {
const newObj = [];
if (proto !== baseProto) {
Object.setPrototypeOf(newObj, proto);
}
return newObj;
}
// Can only be covered in node 21+
/* $lab:coverage:off$ */
else if (baseProto === Types.error && internals.structuredCloneExists &&
(proto === baseProto || Error.isPrototypeOf(proto.constructor))) { // Don't match Util.inherit() subclassed errors
const err = structuredClone(obj); // Needed to copy internal stack state
if (Object.getPrototypeOf(err) !== proto) {
Object.setPrototypeOf(err, proto); // Fix prototype
}
return err;
}
/* $lab:coverage:on$ */
if (internals.needsProtoHack.has(baseProto)) {
const newObj = new proto.constructor();
if (proto !== baseProto) {
Object.setPrototypeOf(newObj, proto);
}
return newObj;
}
return Object.create(proto);
};
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