1 |
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2 |
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3 |
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4 |
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5 | "use strict";
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6 |
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7 | const Queue = require("./util/Queue");
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8 |
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9 | const addToSet = (a, b) => {
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10 | let changed = false;
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11 | for (const item of b) {
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12 | if (!a.has(item)) {
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13 | a.add(item);
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14 | changed = true;
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15 | }
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16 | }
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17 | return changed;
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18 | };
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19 |
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20 | class FlagDependencyExportsPlugin {
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21 | apply(compiler) {
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22 | compiler.hooks.compilation.tap(
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23 | "FlagDependencyExportsPlugin",
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24 | compilation => {
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25 | compilation.hooks.finishModules.tap(
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26 | "FlagDependencyExportsPlugin",
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27 | modules => {
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28 | const dependencies = new Map();
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29 |
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30 | const queue = new Queue();
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31 |
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32 | let module;
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33 | let moduleWithExports;
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34 | let moduleProvidedExports;
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35 |
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36 | const processDependenciesBlock = depBlock => {
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37 | for (const dep of depBlock.dependencies) {
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38 | if (processDependency(dep)) return true;
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39 | }
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40 | for (const variable of depBlock.variables) {
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41 | for (const dep of variable.dependencies) {
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42 | if (processDependency(dep)) return true;
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43 | }
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44 | }
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45 | for (const block of depBlock.blocks) {
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46 | if (processDependenciesBlock(block)) return true;
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47 | }
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48 | return false;
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49 | };
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50 |
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51 | const processDependency = dep => {
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52 | const exportDesc = dep.getExports && dep.getExports();
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53 | if (!exportDesc) return;
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54 | moduleWithExports = true;
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55 | const exports = exportDesc.exports;
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56 |
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57 | if (module.buildMeta.providedExports === true) {
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58 | return true;
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59 | }
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60 |
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61 | if (exports === true) {
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62 | module.buildMeta.providedExports = true;
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63 | notifyDependencies();
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64 | return true;
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65 | }
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66 |
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67 | if (Array.isArray(exports)) {
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68 | if (addToSet(moduleProvidedExports, exports)) {
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69 | notifyDependencies();
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70 | }
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71 | }
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72 |
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73 | const exportDeps = exportDesc.dependencies;
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74 | if (exportDeps) {
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75 | for (const exportDependency of exportDeps) {
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76 |
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77 | const set = dependencies.get(exportDependency);
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78 | if (set === undefined) {
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79 | dependencies.set(exportDependency, new Set([module]));
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80 | } else {
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81 | set.add(module);
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82 | }
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83 | }
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84 | }
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85 | return false;
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86 | };
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87 |
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88 | const notifyDependencies = () => {
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89 | const deps = dependencies.get(module);
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90 | if (deps !== undefined) {
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91 | for (const dep of deps) {
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92 | queue.enqueue(dep);
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93 | }
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94 | }
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95 | };
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96 |
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97 |
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98 | for (const module of modules) {
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99 | if (!module.buildMeta.providedExports) {
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100 | queue.enqueue(module);
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101 | }
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102 | }
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103 |
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104 | while (queue.length > 0) {
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105 | module = queue.dequeue();
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106 |
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107 | if (module.buildMeta.providedExports !== true) {
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108 | moduleWithExports =
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109 | module.buildMeta && module.buildMeta.exportsType;
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110 | moduleProvidedExports = Array.isArray(
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111 | module.buildMeta.providedExports
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112 | )
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113 | ? new Set(module.buildMeta.providedExports)
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114 | : new Set();
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115 | processDependenciesBlock(module);
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116 | if (!moduleWithExports) {
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117 | module.buildMeta.providedExports = true;
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118 | notifyDependencies();
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119 | } else if (module.buildMeta.providedExports !== true) {
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120 | module.buildMeta.providedExports = Array.from(
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121 | moduleProvidedExports
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122 | );
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123 | }
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124 | }
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125 | }
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126 | }
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127 | );
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128 | const providedExportsCache = new WeakMap();
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129 | compilation.hooks.rebuildModule.tap(
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130 | "FlagDependencyExportsPlugin",
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131 | module => {
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132 | providedExportsCache.set(module, module.buildMeta.providedExports);
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133 | }
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134 | );
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135 | compilation.hooks.finishRebuildingModule.tap(
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136 | "FlagDependencyExportsPlugin",
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137 | module => {
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138 | module.buildMeta.providedExports = providedExportsCache.get(module);
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139 | }
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140 | );
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141 | }
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142 | );
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143 | }
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144 | }
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145 |
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146 | module.exports = FlagDependencyExportsPlugin;
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