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8 |
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9 | 'use strict';
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10 |
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11 | var ExecutionEnvironment = require('fbjs/lib/ExecutionEnvironment');
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12 |
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13 | var getNodeForCharacterOffset = require('./getNodeForCharacterOffset');
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14 | var getTextContentAccessor = require('./getTextContentAccessor');
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15 |
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16 |
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17 |
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18 |
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19 |
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20 |
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21 | function isCollapsed(anchorNode, anchorOffset, focusNode, focusOffset) {
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22 | return anchorNode === focusNode && anchorOffset === focusOffset;
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23 | }
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24 |
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25 |
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26 |
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27 |
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28 |
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29 |
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30 |
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31 |
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32 |
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33 |
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34 |
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35 |
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36 |
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37 |
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38 |
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39 | function getIEOffsets(node) {
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40 | var selection = document.selection;
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41 | var selectedRange = selection.createRange();
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42 | var selectedLength = selectedRange.text.length;
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43 |
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44 |
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45 | var fromStart = selectedRange.duplicate();
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46 | fromStart.moveToElementText(node);
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47 | fromStart.setEndPoint('EndToStart', selectedRange);
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48 |
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49 | var startOffset = fromStart.text.length;
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50 | var endOffset = startOffset + selectedLength;
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51 |
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52 | return {
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53 | start: startOffset,
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54 | end: endOffset
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55 | };
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56 | }
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57 |
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58 |
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59 |
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60 |
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61 |
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62 | function getModernOffsets(node) {
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63 | var selection = window.getSelection && window.getSelection();
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64 |
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65 | if (!selection || selection.rangeCount === 0) {
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66 | return null;
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67 | }
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68 |
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69 | var anchorNode = selection.anchorNode;
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70 | var anchorOffset = selection.anchorOffset;
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71 | var focusNode = selection.focusNode;
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72 | var focusOffset = selection.focusOffset;
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73 |
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74 | var currentRange = selection.getRangeAt(0);
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75 |
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76 |
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77 |
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78 |
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79 |
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80 |
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81 |
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82 |
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83 | try {
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84 |
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85 | currentRange.startContainer.nodeType;
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86 | currentRange.endContainer.nodeType;
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87 |
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88 | } catch (e) {
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89 | return null;
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90 | }
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91 |
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92 |
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93 |
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94 |
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95 | var isSelectionCollapsed = isCollapsed(selection.anchorNode, selection.anchorOffset, selection.focusNode, selection.focusOffset);
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96 |
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97 | var rangeLength = isSelectionCollapsed ? 0 : currentRange.toString().length;
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98 |
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99 | var tempRange = currentRange.cloneRange();
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100 | tempRange.selectNodeContents(node);
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101 | tempRange.setEnd(currentRange.startContainer, currentRange.startOffset);
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102 |
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103 | var isTempRangeCollapsed = isCollapsed(tempRange.startContainer, tempRange.startOffset, tempRange.endContainer, tempRange.endOffset);
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104 |
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105 | var start = isTempRangeCollapsed ? 0 : tempRange.toString().length;
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106 | var end = start + rangeLength;
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107 |
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108 |
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109 | var detectionRange = document.createRange();
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110 | detectionRange.setStart(anchorNode, anchorOffset);
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111 | detectionRange.setEnd(focusNode, focusOffset);
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112 | var isBackward = detectionRange.collapsed;
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113 |
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114 | return {
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115 | start: isBackward ? end : start,
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116 | end: isBackward ? start : end
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117 | };
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118 | }
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119 |
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120 |
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121 |
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122 |
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123 |
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124 | function setIEOffsets(node, offsets) {
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125 | var range = document.selection.createRange().duplicate();
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126 | var start, end;
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127 |
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128 | if (offsets.end === undefined) {
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129 | start = offsets.start;
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130 | end = start;
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131 | } else if (offsets.start > offsets.end) {
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132 | start = offsets.end;
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133 | end = offsets.start;
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134 | } else {
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135 | start = offsets.start;
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136 | end = offsets.end;
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137 | }
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138 |
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139 | range.moveToElementText(node);
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140 | range.moveStart('character', start);
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141 | range.setEndPoint('EndToStart', range);
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142 | range.moveEnd('character', end - start);
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143 | range.select();
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144 | }
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145 |
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146 |
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147 |
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148 |
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149 |
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150 |
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151 |
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152 |
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153 |
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154 |
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155 |
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156 |
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157 |
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158 | function setModernOffsets(node, offsets) {
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159 | if (!window.getSelection) {
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160 | return;
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161 | }
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162 |
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163 | var selection = window.getSelection();
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164 | var length = node[getTextContentAccessor()].length;
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165 | var start = Math.min(offsets.start, length);
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166 | var end = offsets.end === undefined ? start : Math.min(offsets.end, length);
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167 |
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168 |
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169 |
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170 | if (!selection.extend && start > end) {
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171 | var temp = end;
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172 | end = start;
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173 | start = temp;
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174 | }
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175 |
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176 | var startMarker = getNodeForCharacterOffset(node, start);
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177 | var endMarker = getNodeForCharacterOffset(node, end);
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178 |
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179 | if (startMarker && endMarker) {
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180 | var range = document.createRange();
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181 | range.setStart(startMarker.node, startMarker.offset);
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182 | selection.removeAllRanges();
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183 |
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184 | if (start > end) {
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185 | selection.addRange(range);
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186 | selection.extend(endMarker.node, endMarker.offset);
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187 | } else {
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188 | range.setEnd(endMarker.node, endMarker.offset);
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189 | selection.addRange(range);
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190 | }
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191 | }
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192 | }
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193 |
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194 | var useIEOffsets = ExecutionEnvironment.canUseDOM && 'selection' in document && !('getSelection' in window);
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195 |
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196 | var ReactDOMSelection = {
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197 | |
198 |
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199 |
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200 | getOffsets: useIEOffsets ? getIEOffsets : getModernOffsets,
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201 |
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202 | |
203 |
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204 |
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205 |
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206 | setOffsets: useIEOffsets ? setIEOffsets : setModernOffsets
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207 | };
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208 |
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209 | module.exports = ReactDOMSelection; |
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