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 { STAGE_DEFAULT } = require("./OptimizationStages");
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11 | const TupleQueue = require("./util/TupleQueue");
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12 | const {
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13 | getEntryRuntime,
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14 | mergeRuntime,
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15 | mergeRuntimeOwned
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16 | } = require("./util/runtime");
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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 |
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26 |
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27 |
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28 | const { NO_EXPORTS_REFERENCED, EXPORTS_OBJECT_REFERENCED } = Dependency;
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29 |
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30 | class FlagDependencyUsagePlugin {
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31 | |
32 |
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33 |
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34 | constructor(global) {
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35 | this.global = global;
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36 | }
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37 |
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38 | |
39 |
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40 |
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41 |
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42 |
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43 | apply(compiler) {
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44 | compiler.hooks.compilation.tap("FlagDependencyUsagePlugin", compilation => {
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45 | const moduleGraph = compilation.moduleGraph;
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46 | compilation.hooks.optimizeDependencies.tap(
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47 | {
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48 | name: "FlagDependencyUsagePlugin",
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49 | stage: STAGE_DEFAULT
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50 | },
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51 | modules => {
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52 | const logger = compilation.getLogger(
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53 | "webpack.FlagDependencyUsagePlugin"
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54 | );
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55 |
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56 |
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57 | const exportInfoToModuleMap = new Map();
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58 |
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59 |
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60 | const queue = new TupleQueue();
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61 |
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62 | |
63 |
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64 |
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65 |
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66 |
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67 |
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68 |
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69 | const processReferencedModule = (
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70 | module,
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71 | usedExports,
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72 | runtime,
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73 | forceSideEffects
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74 | ) => {
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75 | const exportsInfo = moduleGraph.getExportsInfo(module);
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76 | if (usedExports.length > 0) {
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77 | if (!module.buildMeta || !module.buildMeta.exportsType) {
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78 | if (exportsInfo.setUsedWithoutInfo(runtime)) {
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79 | queue.enqueue(module, runtime);
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80 | }
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81 | return;
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82 | }
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83 | for (const usedExportInfo of usedExports) {
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84 | let usedExport;
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85 | let canMangle = true;
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86 | if (Array.isArray(usedExportInfo)) {
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87 | usedExport = usedExportInfo;
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88 | } else {
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89 | usedExport = usedExportInfo.name;
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90 | canMangle = usedExportInfo.canMangle !== false;
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91 | }
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92 | if (usedExport.length === 0) {
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93 | if (exportsInfo.setUsedInUnknownWay(runtime)) {
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94 | queue.enqueue(module, runtime);
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95 | }
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96 | } else {
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97 | let currentExportsInfo = exportsInfo;
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98 | for (let i = 0; i < usedExport.length; i++) {
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99 | const exportInfo = currentExportsInfo.getExportInfo(
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100 | usedExport[i]
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101 | );
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102 | if (canMangle === false) {
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103 | exportInfo.canMangleUse = false;
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104 | }
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105 | const lastOne = i === usedExport.length - 1;
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106 | if (!lastOne) {
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107 | const nestedInfo = exportInfo.getNestedExportsInfo();
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108 | if (nestedInfo) {
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109 | if (
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110 | exportInfo.setUsedConditionally(
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111 | used => used === UsageState.Unused,
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112 | UsageState.OnlyPropertiesUsed,
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113 | runtime
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114 | )
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115 | ) {
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116 | const currentModule =
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117 | currentExportsInfo === exportsInfo
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118 | ? module
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119 | : exportInfoToModuleMap.get(currentExportsInfo);
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120 | if (currentModule) {
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121 | queue.enqueue(currentModule, runtime);
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122 | }
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123 | }
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124 | currentExportsInfo = nestedInfo;
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125 | continue;
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126 | }
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127 | }
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128 | if (
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129 | exportInfo.setUsedConditionally(
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130 | v => v !== UsageState.Used,
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131 | UsageState.Used,
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132 | runtime
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133 | )
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134 | ) {
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135 | const currentModule =
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136 | currentExportsInfo === exportsInfo
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137 | ? module
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138 | : exportInfoToModuleMap.get(currentExportsInfo);
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139 | if (currentModule) {
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140 | queue.enqueue(currentModule, runtime);
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141 | }
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142 | }
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143 | break;
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144 | }
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145 | }
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146 | }
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147 | } else {
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148 |
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149 |
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150 |
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151 | if (
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152 | !forceSideEffects &&
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153 | module.factoryMeta !== undefined &&
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154 | module.factoryMeta.sideEffectFree
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155 | ) {
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156 | return;
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157 | }
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158 | if (exportsInfo.setUsedForSideEffectsOnly(runtime)) {
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159 | queue.enqueue(module, runtime);
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160 | }
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161 | }
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162 | };
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163 |
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164 | |
165 |
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166 |
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167 |
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168 |
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169 | const processModule = (module, runtime) => {
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170 |
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171 | const map = new Map();
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172 |
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173 |
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174 | const queue = [module];
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175 | for (const block of queue) {
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176 | for (const b of block.blocks) {
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177 | if (b.groupOptions && b.groupOptions.entryOptions) {
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178 | processModule(b, b.groupOptions.entryOptions.runtime);
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179 | } else {
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180 | queue.push(b);
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181 | }
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182 | }
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183 | for (const dep of block.dependencies) {
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184 | const connection = moduleGraph.getConnection(dep);
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185 | if (
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186 | !connection ||
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187 | !connection.module ||
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188 | !connection.isTargetActive(runtime)
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189 | ) {
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190 | continue;
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191 | }
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192 | const { module } = connection;
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193 | const oldReferencedExports = map.get(module);
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194 | if (oldReferencedExports === EXPORTS_OBJECT_REFERENCED) {
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195 | continue;
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196 | }
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197 | const referencedExports = compilation.getDependencyReferencedExports(
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198 | dep,
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199 | runtime
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200 | );
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201 | if (
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202 | oldReferencedExports === undefined ||
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203 | oldReferencedExports === NO_EXPORTS_REFERENCED ||
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204 | referencedExports === EXPORTS_OBJECT_REFERENCED
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205 | ) {
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206 | map.set(module, referencedExports);
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207 | } else if (oldReferencedExports === NO_EXPORTS_REFERENCED) {
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208 | continue;
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209 | } else {
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210 | let exportsMap;
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211 | if (Array.isArray(oldReferencedExports)) {
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212 | exportsMap = new Map();
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213 | for (const item of oldReferencedExports) {
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214 | if (Array.isArray(item)) {
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215 | exportsMap.set(item.join("\n"), item);
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216 | } else {
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217 | exportsMap.set(item.name.join("\n"), item);
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218 | }
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219 | }
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220 | map.set(module, exportsMap);
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221 | } else {
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222 | exportsMap = oldReferencedExports;
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223 | }
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224 | for (const item of referencedExports) {
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225 | if (Array.isArray(item)) {
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226 | const key = item.join("\n");
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227 | const oldItem = exportsMap.get(key);
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228 | if (oldItem === undefined) {
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229 | exportsMap.set(key, item);
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230 | }
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231 |
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232 |
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233 |
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234 | } else {
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235 | const key = item.name.join("\n");
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236 | const oldItem = exportsMap.get(key);
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237 | if (oldItem === undefined || Array.isArray(oldItem)) {
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238 | exportsMap.set(key, item);
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239 | } else {
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240 | exportsMap.set(key, {
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241 | name: item.name,
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242 | canMangle: item.canMangle && oldItem.canMangle
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243 | });
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244 | }
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245 | }
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246 | }
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247 | }
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248 | }
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249 | }
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250 |
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251 | for (const [module, referencedExports] of map) {
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252 | if (Array.isArray(referencedExports)) {
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253 | processReferencedModule(
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254 | module,
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255 | referencedExports,
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256 | runtime,
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257 | false
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258 | );
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259 | } else {
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260 | processReferencedModule(
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261 | module,
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262 | Array.from(referencedExports.values()),
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263 | runtime,
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264 | false
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265 | );
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266 | }
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267 | }
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268 | };
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269 |
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270 | logger.time("initialize exports usage");
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271 | for (const module of modules) {
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272 | const exportsInfo = moduleGraph.getExportsInfo(module);
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273 | exportInfoToModuleMap.set(exportsInfo, module);
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274 | exportsInfo.setHasUseInfo();
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275 | }
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276 | logger.timeEnd("initialize exports usage");
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277 |
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278 | logger.time("trace exports usage in graph");
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279 |
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280 | |
281 |
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282 |
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283 |
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284 | const processEntryDependency = (dep, runtime) => {
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285 | const module = moduleGraph.getModule(dep);
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286 | if (module) {
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287 | processReferencedModule(
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288 | module,
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289 | NO_EXPORTS_REFERENCED,
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290 | runtime,
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291 | true
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292 | );
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293 | }
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294 | };
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295 |
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296 | let globalRuntime = undefined;
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297 | for (const [
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298 | entryName,
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299 | { dependencies: deps, includeDependencies: includeDeps, options }
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300 | ] of compilation.entries) {
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301 | const runtime = this.global
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302 | ? undefined
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303 | : getEntryRuntime(compilation, entryName, options);
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304 | for (const dep of deps) {
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305 | processEntryDependency(dep, runtime);
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306 | }
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307 | for (const dep of includeDeps) {
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308 | processEntryDependency(dep, runtime);
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309 | }
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310 | globalRuntime = mergeRuntimeOwned(globalRuntime, runtime);
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311 | }
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312 | for (const dep of compilation.globalEntry.dependencies) {
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313 | processEntryDependency(dep, globalRuntime);
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314 | }
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315 | for (const dep of compilation.globalEntry.includeDependencies) {
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316 | processEntryDependency(dep, globalRuntime);
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317 | }
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318 |
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319 | while (queue.length) {
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320 | const [module, runtime] = queue.dequeue();
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321 | processModule(module, runtime);
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322 | }
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323 | logger.timeEnd("trace exports usage in graph");
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324 | }
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325 | );
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326 | if (!this.global) {
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327 | compilation.hooks.afterChunks.tap("FlagDependencyUsagePlugin", () => {
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328 | const processEntrypoint = entrypoint => {
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329 | const runtime = getEntryRuntime(
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330 | compilation,
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331 | entrypoint.name,
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332 | entrypoint.options
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333 | );
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334 | for (const chunk of entrypoint
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335 | .getEntrypointChunk()
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336 | .getAllReferencedChunks()) {
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337 | chunk.runtime = mergeRuntime(chunk.runtime, runtime);
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338 | }
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339 | };
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340 | for (const entrypoint of compilation.entrypoints.values()) {
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341 | processEntrypoint(entrypoint);
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342 | }
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343 | for (const asyncEntry of compilation.asyncEntrypoints) {
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344 | processEntrypoint(asyncEntry);
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345 | }
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346 | });
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347 |
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348 | compilation.hooks.optimizeChunkModules.tap(
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349 | "FlagDependencyUsagePlugin",
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350 | (chunks, modules) => {
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351 | for (const module of modules) {
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352 | const exportsInfo = compilation.moduleGraph.getExportsInfo(
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353 | module
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354 | );
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355 | let removeFromRuntimes = undefined;
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356 | for (const runtime of compilation.chunkGraph.getModuleRuntimes(
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357 | module
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358 | )) {
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359 | if (!exportsInfo.isModuleUsed(runtime)) {
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360 | if (removeFromRuntimes === undefined) {
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361 | removeFromRuntimes = new Set();
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362 | }
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363 | removeFromRuntimes.add(runtime);
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364 | }
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365 | }
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366 | if (removeFromRuntimes !== undefined) {
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367 | for (const chunk of compilation.chunkGraph.getModuleChunksIterable(
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368 | module
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369 | )) {
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370 | if (removeFromRuntimes.has(chunk.runtime)) {
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371 | compilation.chunkGraph.disconnectChunkAndModule(
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372 | chunk,
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373 | module
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374 | );
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375 | }
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376 | }
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377 | }
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378 | }
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379 | }
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380 | );
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381 | }
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382 | });
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383 | }
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384 | }
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385 |
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386 | module.exports = FlagDependencyUsagePlugin;
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