1 |
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2 |
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3 |
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4 |
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5 |
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6 | "use strict";
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7 |
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8 | const Dependency = require("./Dependency");
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9 | const { UsageState } = require("./ExportsInfo");
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10 | const ModuleGraphConnection = require("./ModuleGraphConnection");
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11 | const { STAGE_DEFAULT } = require("./OptimizationStages");
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12 | const ArrayQueue = require("./util/ArrayQueue");
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13 | const TupleQueue = require("./util/TupleQueue");
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14 | const { getEntryRuntime, mergeRuntimeOwned } = require("./util/runtime");
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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 |
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22 |
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23 |
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24 |
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25 | const { NO_EXPORTS_REFERENCED, EXPORTS_OBJECT_REFERENCED } = Dependency;
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26 |
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27 | class FlagDependencyUsagePlugin {
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28 | |
29 |
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30 |
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31 | constructor(global) {
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32 | this.global = global;
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33 | }
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34 |
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35 | |
36 |
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37 |
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38 |
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39 |
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40 | apply(compiler) {
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41 | compiler.hooks.compilation.tap("FlagDependencyUsagePlugin", compilation => {
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42 | const moduleGraph = compilation.moduleGraph;
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43 | compilation.hooks.optimizeDependencies.tap(
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44 | {
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45 | name: "FlagDependencyUsagePlugin",
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46 | stage: STAGE_DEFAULT
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47 | },
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48 | modules => {
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49 | const logger = compilation.getLogger(
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50 | "webpack.FlagDependencyUsagePlugin"
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51 | );
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52 |
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53 |
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54 | const exportInfoToModuleMap = new Map();
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55 |
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56 |
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57 | const queue = new TupleQueue();
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58 |
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59 | |
60 |
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61 |
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62 |
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63 |
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64 |
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65 |
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66 | const processReferencedModule = (
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67 | module,
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68 | usedExports,
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69 | runtime,
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70 | forceSideEffects
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71 | ) => {
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72 | const exportsInfo = moduleGraph.getExportsInfo(module);
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73 | if (usedExports.length > 0) {
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74 | if (!module.buildMeta || !module.buildMeta.exportsType) {
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75 | if (exportsInfo.setUsedWithoutInfo(runtime)) {
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76 | queue.enqueue(module, runtime);
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77 | }
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78 | return;
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79 | }
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80 | for (const usedExportInfo of usedExports) {
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81 | let usedExport;
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82 | let canMangle = true;
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83 | if (Array.isArray(usedExportInfo)) {
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84 | usedExport = usedExportInfo;
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85 | } else {
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86 | usedExport = usedExportInfo.name;
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87 | canMangle = usedExportInfo.canMangle !== false;
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88 | }
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89 | if (usedExport.length === 0) {
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90 | if (exportsInfo.setUsedInUnknownWay(runtime)) {
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91 | queue.enqueue(module, runtime);
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92 | }
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93 | } else {
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94 | let currentExportsInfo = exportsInfo;
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95 | for (let i = 0; i < usedExport.length; i++) {
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96 | const exportInfo = currentExportsInfo.getExportInfo(
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97 | usedExport[i]
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98 | );
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99 | if (canMangle === false) {
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100 | exportInfo.canMangleUse = false;
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101 | }
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102 | const lastOne = i === usedExport.length - 1;
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103 | if (!lastOne) {
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104 | const nestedInfo = exportInfo.getNestedExportsInfo();
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105 | if (nestedInfo) {
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106 | if (
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107 | exportInfo.setUsedConditionally(
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108 | used => used === UsageState.Unused,
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109 | UsageState.OnlyPropertiesUsed,
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110 | runtime
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111 | )
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112 | ) {
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113 | const currentModule =
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114 | currentExportsInfo === exportsInfo
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115 | ? module
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116 | : exportInfoToModuleMap.get(currentExportsInfo);
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117 | if (currentModule) {
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118 | queue.enqueue(currentModule, runtime);
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119 | }
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120 | }
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121 | currentExportsInfo = nestedInfo;
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122 | continue;
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123 | }
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124 | }
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125 | if (
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126 | exportInfo.setUsedConditionally(
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127 | v => v !== UsageState.Used,
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128 | UsageState.Used,
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129 | runtime
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130 | )
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131 | ) {
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132 | const currentModule =
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133 | currentExportsInfo === exportsInfo
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134 | ? module
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135 | : exportInfoToModuleMap.get(currentExportsInfo);
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136 | if (currentModule) {
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137 | queue.enqueue(currentModule, runtime);
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138 | }
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139 | }
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140 | break;
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141 | }
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142 | }
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143 | }
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144 | } else {
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145 |
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146 |
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147 |
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148 | if (
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149 | !forceSideEffects &&
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150 | module.factoryMeta !== undefined &&
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151 | module.factoryMeta.sideEffectFree
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152 | ) {
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153 | return;
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154 | }
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155 | if (exportsInfo.setUsedForSideEffectsOnly(runtime)) {
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156 | queue.enqueue(module, runtime);
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157 | }
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158 | }
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159 | };
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160 |
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161 | |
162 |
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163 |
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164 |
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165 |
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166 |
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167 | const processModule = (module, runtime, forceSideEffects) => {
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168 |
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169 | const map = new Map();
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170 |
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171 |
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172 | const queue = new ArrayQueue();
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173 | queue.enqueue(module);
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174 | for (;;) {
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175 | const block = queue.dequeue();
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176 | if (block === undefined) break;
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177 | for (const b of block.blocks) {
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178 | if (
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179 | !this.global &&
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180 | b.groupOptions &&
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181 | b.groupOptions.entryOptions
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182 | ) {
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183 | processModule(b, b.groupOptions.entryOptions.runtime, true);
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184 | } else {
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185 | queue.enqueue(b);
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186 | }
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187 | }
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188 | for (const dep of block.dependencies) {
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189 | const connection = moduleGraph.getConnection(dep);
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190 | if (!connection || !connection.module) {
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191 | continue;
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192 | }
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193 | const activeState = connection.getActiveState(runtime);
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194 | if (activeState === false) continue;
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195 | const { module } = connection;
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196 | if (activeState === ModuleGraphConnection.TRANSITIVE_ONLY) {
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197 | processModule(module, runtime, false);
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198 | continue;
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199 | }
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200 | const oldReferencedExports = map.get(module);
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201 | if (oldReferencedExports === EXPORTS_OBJECT_REFERENCED) {
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202 | continue;
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203 | }
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204 | const referencedExports = compilation.getDependencyReferencedExports(
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205 | dep,
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206 | runtime
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207 | );
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208 | if (
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209 | oldReferencedExports === undefined ||
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210 | oldReferencedExports === NO_EXPORTS_REFERENCED ||
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211 | referencedExports === EXPORTS_OBJECT_REFERENCED
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212 | ) {
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213 | map.set(module, referencedExports);
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214 | } else if (
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215 | oldReferencedExports !== undefined &&
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216 | referencedExports === NO_EXPORTS_REFERENCED
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217 | ) {
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218 | continue;
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219 | } else {
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220 | let exportsMap;
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221 | if (Array.isArray(oldReferencedExports)) {
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222 | exportsMap = new Map();
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223 | for (const item of oldReferencedExports) {
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224 | if (Array.isArray(item)) {
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225 | exportsMap.set(item.join("\n"), item);
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226 | } else {
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227 | exportsMap.set(item.name.join("\n"), item);
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228 | }
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229 | }
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230 | map.set(module, exportsMap);
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231 | } else {
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232 | exportsMap = oldReferencedExports;
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233 | }
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234 | for (const item of referencedExports) {
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235 | if (Array.isArray(item)) {
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236 | const key = item.join("\n");
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237 | const oldItem = exportsMap.get(key);
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238 | if (oldItem === undefined) {
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239 | exportsMap.set(key, item);
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240 | }
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241 |
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242 |
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243 |
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244 | } else {
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245 | const key = item.name.join("\n");
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246 | const oldItem = exportsMap.get(key);
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247 | if (oldItem === undefined || Array.isArray(oldItem)) {
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248 | exportsMap.set(key, item);
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249 | } else {
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250 | exportsMap.set(key, {
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251 | name: item.name,
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252 | canMangle: item.canMangle && oldItem.canMangle
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253 | });
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254 | }
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255 | }
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256 | }
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257 | }
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258 | }
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259 | }
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260 |
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261 | for (const [module, referencedExports] of map) {
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262 | if (Array.isArray(referencedExports)) {
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263 | processReferencedModule(
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264 | module,
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265 | referencedExports,
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266 | runtime,
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267 | forceSideEffects
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268 | );
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269 | } else {
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270 | processReferencedModule(
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271 | module,
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272 | Array.from(referencedExports.values()),
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273 | runtime,
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274 | forceSideEffects
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275 | );
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276 | }
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277 | }
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278 | };
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279 |
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280 | logger.time("initialize exports usage");
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281 | for (const module of modules) {
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282 | const exportsInfo = moduleGraph.getExportsInfo(module);
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283 | exportInfoToModuleMap.set(exportsInfo, module);
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284 | exportsInfo.setHasUseInfo();
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285 | }
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286 | logger.timeEnd("initialize exports usage");
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287 |
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288 | logger.time("trace exports usage in graph");
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289 |
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290 | |
291 |
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292 |
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293 |
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294 | const processEntryDependency = (dep, runtime) => {
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295 | const module = moduleGraph.getModule(dep);
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296 | if (module) {
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297 | processReferencedModule(
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298 | module,
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299 | NO_EXPORTS_REFERENCED,
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300 | runtime,
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301 | true
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302 | );
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303 | }
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304 | };
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305 |
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306 | let globalRuntime = undefined;
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307 | for (const [
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308 | entryName,
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309 | { dependencies: deps, includeDependencies: includeDeps, options }
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310 | ] of compilation.entries) {
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311 | const runtime = this.global
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312 | ? undefined
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313 | : getEntryRuntime(compilation, entryName, options);
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314 | for (const dep of deps) {
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315 | processEntryDependency(dep, runtime);
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316 | }
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317 | for (const dep of includeDeps) {
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318 | processEntryDependency(dep, runtime);
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319 | }
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320 | globalRuntime = mergeRuntimeOwned(globalRuntime, runtime);
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321 | }
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322 | for (const dep of compilation.globalEntry.dependencies) {
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323 | processEntryDependency(dep, globalRuntime);
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324 | }
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325 | for (const dep of compilation.globalEntry.includeDependencies) {
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326 | processEntryDependency(dep, globalRuntime);
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327 | }
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328 |
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329 | while (queue.length) {
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330 | const [module, runtime] = queue.dequeue();
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331 | processModule(module, runtime, false);
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332 | }
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333 | logger.timeEnd("trace exports usage in graph");
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334 | }
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335 | );
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336 | });
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337 | }
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338 | }
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339 |
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340 | module.exports = FlagDependencyUsagePlugin;
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