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6 |
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7 | 'use strict';
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8 |
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9 | var randomBytes = require('randombytes');
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10 |
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11 |
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12 | var UID_LENGTH = 16;
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13 | var UID = generateUID();
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14 | var PLACE_HOLDER_REGEXP = new RegExp('(\\\\)?"@__(F|R|D|M|S|A|U|I|B|L)-' + UID + '-(\\d+)__@"', 'g');
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15 |
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16 | var IS_NATIVE_CODE_REGEXP = /\{\s*\[native code\]\s*\}/g;
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17 | var IS_PURE_FUNCTION = /function.*?\(/;
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18 | var IS_ARROW_FUNCTION = /.*?=>.*?/;
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19 | var UNSAFE_CHARS_REGEXP = /[<>\/\u2028\u2029]/g;
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20 |
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21 | var RESERVED_SYMBOLS = ['*', 'async'];
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22 |
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23 |
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24 |
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25 | var ESCAPED_CHARS = {
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26 | '<' : '\\u003C',
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27 | '>' : '\\u003E',
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28 | '/' : '\\u002F',
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29 | '\u2028': '\\u2028',
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30 | '\u2029': '\\u2029'
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31 | };
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32 |
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33 | function escapeUnsafeChars(unsafeChar) {
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34 | return ESCAPED_CHARS[unsafeChar];
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35 | }
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36 |
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37 | function generateUID() {
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38 | var bytes = randomBytes(UID_LENGTH);
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39 | var result = '';
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40 | for(var i=0; i<UID_LENGTH; ++i) {
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41 | result += bytes[i].toString(16);
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42 | }
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43 | return result;
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44 | }
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45 |
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46 | function deleteFunctions(obj){
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47 | var functionKeys = [];
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48 | for (var key in obj) {
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49 | if (typeof obj[key] === "function") {
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50 | functionKeys.push(key);
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51 | }
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52 | }
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53 | for (var i = 0; i < functionKeys.length; i++) {
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54 | delete obj[functionKeys[i]];
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55 | }
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56 | }
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57 |
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58 | module.exports = function serialize(obj, options) {
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59 | options || (options = {});
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60 |
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61 |
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62 | if (typeof options === 'number' || typeof options === 'string') {
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63 | options = {space: options};
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64 | }
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65 |
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66 | var functions = [];
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67 | var regexps = [];
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68 | var dates = [];
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69 | var maps = [];
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70 | var sets = [];
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71 | var arrays = [];
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72 | var undefs = [];
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73 | var infinities= [];
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74 | var bigInts = [];
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75 | var urls = [];
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76 |
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77 |
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78 |
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79 | function replacer(key, value) {
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80 |
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81 |
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82 | if(options.ignoreFunction){
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83 | deleteFunctions(value);
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84 | }
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85 |
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86 | if (!value && value !== undefined) {
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87 | return value;
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88 | }
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89 |
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90 |
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91 |
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92 | var origValue = this[key];
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93 | var type = typeof origValue;
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94 |
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95 | if (type === 'object') {
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96 | if(origValue instanceof RegExp) {
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97 | return '@__R-' + UID + '-' + (regexps.push(origValue) - 1) + '__@';
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98 | }
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99 |
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100 | if(origValue instanceof Date) {
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101 | return '@__D-' + UID + '-' + (dates.push(origValue) - 1) + '__@';
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102 | }
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103 |
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104 | if(origValue instanceof Map) {
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105 | return '@__M-' + UID + '-' + (maps.push(origValue) - 1) + '__@';
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106 | }
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107 |
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108 | if(origValue instanceof Set) {
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109 | return '@__S-' + UID + '-' + (sets.push(origValue) - 1) + '__@';
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110 | }
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111 |
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112 | if(origValue instanceof Array) {
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113 | var isSparse = origValue.filter(function(){return true}).length !== origValue.length;
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114 | if (isSparse) {
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115 | return '@__A-' + UID + '-' + (arrays.push(origValue) - 1) + '__@';
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116 | }
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117 | }
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118 |
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119 | if(origValue instanceof URL) {
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120 | return '@__L-' + UID + '-' + (urls.push(origValue) - 1) + '__@';
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121 | }
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122 | }
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123 |
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124 | if (type === 'function') {
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125 | return '@__F-' + UID + '-' + (functions.push(origValue) - 1) + '__@';
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126 | }
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127 |
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128 | if (type === 'undefined') {
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129 | return '@__U-' + UID + '-' + (undefs.push(origValue) - 1) + '__@';
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130 | }
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131 |
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132 | if (type === 'number' && !isNaN(origValue) && !isFinite(origValue)) {
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133 | return '@__I-' + UID + '-' + (infinities.push(origValue) - 1) + '__@';
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134 | }
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135 |
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136 | if (type === 'bigint') {
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137 | return '@__B-' + UID + '-' + (bigInts.push(origValue) - 1) + '__@';
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138 | }
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139 |
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140 | return value;
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141 | }
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142 |
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143 | function serializeFunc(fn) {
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144 | var serializedFn = fn.toString();
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145 | if (IS_NATIVE_CODE_REGEXP.test(serializedFn)) {
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146 | throw new TypeError('Serializing native function: ' + fn.name);
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147 | }
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148 |
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149 |
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150 | if(IS_PURE_FUNCTION.test(serializedFn)) {
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151 | return serializedFn;
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152 | }
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153 |
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154 |
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155 | if(IS_ARROW_FUNCTION.test(serializedFn)) {
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156 | return serializedFn;
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157 | }
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158 |
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159 | var argsStartsAt = serializedFn.indexOf('(');
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160 | var def = serializedFn.substr(0, argsStartsAt)
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161 | .trim()
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162 | .split(' ')
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163 | .filter(function(val) { return val.length > 0 });
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164 |
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165 | var nonReservedSymbols = def.filter(function(val) {
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166 | return RESERVED_SYMBOLS.indexOf(val) === -1
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167 | });
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168 |
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169 |
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170 | if(nonReservedSymbols.length > 0) {
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171 | return (def.indexOf('async') > -1 ? 'async ' : '') + 'function'
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172 | + (def.join('').indexOf('*') > -1 ? '*' : '')
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173 | + serializedFn.substr(argsStartsAt);
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174 | }
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175 |
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176 |
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177 | return serializedFn;
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178 | }
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179 |
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180 |
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181 | if (options.ignoreFunction && typeof obj === "function") {
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182 | obj = undefined;
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183 | }
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184 |
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185 |
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186 | if (obj === undefined) {
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187 | return String(obj);
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188 | }
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189 |
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190 | var str;
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191 |
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192 |
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193 |
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194 | if (options.isJSON && !options.space) {
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195 | str = JSON.stringify(obj);
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196 | } else {
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197 | str = JSON.stringify(obj, options.isJSON ? null : replacer, options.space);
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198 | }
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199 |
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200 |
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201 |
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202 | if (typeof str !== 'string') {
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203 | return String(str);
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204 | }
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205 |
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206 |
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207 |
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208 |
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209 | if (options.unsafe !== true) {
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210 | str = str.replace(UNSAFE_CHARS_REGEXP, escapeUnsafeChars);
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211 | }
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212 |
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213 | if (functions.length === 0 && regexps.length === 0 && dates.length === 0 && maps.length === 0 && sets.length === 0 && arrays.length === 0 && undefs.length === 0 && infinities.length === 0 && bigInts.length === 0 && urls.length === 0) {
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214 | return str;
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215 | }
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216 |
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217 |
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218 |
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219 |
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220 | return str.replace(PLACE_HOLDER_REGEXP, function (match, backSlash, type, valueIndex) {
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221 |
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222 |
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223 |
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224 | if (backSlash) {
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225 | return match;
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226 | }
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227 |
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228 | if (type === 'D') {
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229 | return "new Date(\"" + dates[valueIndex].toISOString() + "\")";
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230 | }
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231 |
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232 | if (type === 'R') {
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233 | return "new RegExp(" + serialize(regexps[valueIndex].source) + ", \"" + regexps[valueIndex].flags + "\")";
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234 | }
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235 |
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236 | if (type === 'M') {
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237 | return "new Map(" + serialize(Array.from(maps[valueIndex].entries()), options) + ")";
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238 | }
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239 |
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240 | if (type === 'S') {
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241 | return "new Set(" + serialize(Array.from(sets[valueIndex].values()), options) + ")";
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242 | }
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243 |
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244 | if (type === 'A') {
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245 | return "Array.prototype.slice.call(" + serialize(Object.assign({ length: arrays[valueIndex].length }, arrays[valueIndex]), options) + ")";
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246 | }
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247 |
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248 | if (type === 'U') {
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249 | return 'undefined'
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250 | }
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251 |
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252 | if (type === 'I') {
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253 | return infinities[valueIndex];
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254 | }
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255 |
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256 | if (type === 'B') {
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257 | return "BigInt(\"" + bigInts[valueIndex] + "\")";
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258 | }
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259 |
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260 | if (type === 'L') {
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261 | return "new URL(\"" + urls[valueIndex].toString() + "\")";
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262 | }
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263 |
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264 | var fn = functions[valueIndex];
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265 |
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266 | return serializeFunc(fn);
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267 | });
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268 | }
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