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 ConstDependency = require("./dependencies/ConstDependency");
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8 | const BasicEvaluatedExpression = require("./BasicEvaluatedExpression");
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9 | const ParserHelpers = require("./ParserHelpers");
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10 | const NullFactory = require("./NullFactory");
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11 |
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12 |
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13 |
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14 |
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15 |
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16 |
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17 | class RuntimeValue {
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18 | constructor(fn, fileDependencies) {
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19 | this.fn = fn;
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20 | this.fileDependencies = fileDependencies || [];
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21 | }
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22 |
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23 | exec(parser) {
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24 | if (this.fileDependencies === true) {
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25 | parser.state.module.buildInfo.cacheable = false;
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26 | } else {
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27 | for (const fileDependency of this.fileDependencies) {
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28 | parser.state.module.buildInfo.fileDependencies.add(fileDependency);
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29 | }
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30 | }
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31 |
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32 | return this.fn({ module: parser.state.module });
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33 | }
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34 | }
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35 |
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36 | const stringifyObj = (obj, parser) => {
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37 | return (
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38 | "Object({" +
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39 | Object.keys(obj)
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40 | .map(key => {
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41 | const code = obj[key];
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42 | return JSON.stringify(key) + ":" + toCode(code, parser);
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43 | })
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44 | .join(",") +
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45 | "})"
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46 | );
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47 | };
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48 |
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49 |
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50 |
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51 |
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52 |
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53 |
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54 |
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55 | const toCode = (code, parser) => {
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56 | if (code === null) {
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57 | return "null";
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58 | }
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59 | if (code === undefined) {
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60 | return "undefined";
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61 | }
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62 | if (code instanceof RuntimeValue) {
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63 | return toCode(code.exec(parser), parser);
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64 | }
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65 | if (code instanceof RegExp && code.toString) {
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66 | return code.toString();
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67 | }
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68 | if (typeof code === "function" && code.toString) {
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69 | return "(" + code.toString() + ")";
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70 | }
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71 | if (typeof code === "object") {
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72 | return stringifyObj(code, parser);
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73 | }
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74 | return code + "";
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75 | };
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76 |
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77 | class DefinePlugin {
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78 | |
79 |
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80 |
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81 |
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82 | constructor(definitions) {
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83 | this.definitions = definitions;
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84 | }
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85 |
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86 | static runtimeValue(fn, fileDependencies) {
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87 | return new RuntimeValue(fn, fileDependencies);
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88 | }
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89 |
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90 | |
91 |
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92 |
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93 |
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94 |
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95 | apply(compiler) {
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96 | const definitions = this.definitions;
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97 | compiler.hooks.compilation.tap(
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98 | "DefinePlugin",
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99 | (compilation, { normalModuleFactory }) => {
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100 | compilation.dependencyFactories.set(ConstDependency, new NullFactory());
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101 | compilation.dependencyTemplates.set(
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102 | ConstDependency,
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103 | new ConstDependency.Template()
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104 | );
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105 |
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106 | |
107 |
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108 |
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109 |
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110 |
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111 | const handler = parser => {
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112 | |
113 |
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114 |
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115 |
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116 |
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117 |
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118 | const walkDefinitions = (definitions, prefix) => {
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119 | Object.keys(definitions).forEach(key => {
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120 | const code = definitions[key];
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121 | if (
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122 | code &&
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123 | typeof code === "object" &&
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124 | !(code instanceof RuntimeValue) &&
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125 | !(code instanceof RegExp)
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126 | ) {
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127 | walkDefinitions(code, prefix + key + ".");
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128 | applyObjectDefine(prefix + key, code);
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129 | return;
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130 | }
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131 | applyDefineKey(prefix, key);
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132 | applyDefine(prefix + key, code);
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133 | });
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134 | };
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135 |
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136 | |
137 |
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138 |
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139 |
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140 |
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141 |
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142 | const applyDefineKey = (prefix, key) => {
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143 | const splittedKey = key.split(".");
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144 | splittedKey.slice(1).forEach((_, i) => {
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145 | const fullKey = prefix + splittedKey.slice(0, i + 1).join(".");
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146 | parser.hooks.canRename
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147 | .for(fullKey)
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148 | .tap("DefinePlugin", ParserHelpers.approve);
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149 | });
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150 | };
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151 |
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152 | |
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 | const applyDefine = (key, code) => {
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159 | const isTypeof = /^typeof\s+/.test(key);
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160 | if (isTypeof) key = key.replace(/^typeof\s+/, "");
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161 | let recurse = false;
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162 | let recurseTypeof = false;
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163 | if (!isTypeof) {
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164 | parser.hooks.canRename
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165 | .for(key)
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166 | .tap("DefinePlugin", ParserHelpers.approve);
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167 | parser.hooks.evaluateIdentifier
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168 | .for(key)
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169 | .tap("DefinePlugin", expr => {
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170 | |
171 |
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172 |
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173 |
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174 |
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175 |
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176 |
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177 |
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178 | if (recurse) return;
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179 | recurse = true;
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180 | const res = parser.evaluate(toCode(code, parser));
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181 | recurse = false;
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182 | res.setRange(expr.range);
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183 | return res;
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184 | });
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185 | parser.hooks.expression.for(key).tap("DefinePlugin", expr => {
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186 | const strCode = toCode(code, parser);
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187 | if (/__webpack_require__/.test(strCode)) {
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188 | return ParserHelpers.toConstantDependencyWithWebpackRequire(
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189 | parser,
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190 | strCode
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191 | )(expr);
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192 | } else {
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193 | return ParserHelpers.toConstantDependency(parser, strCode)(
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194 | expr
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195 | );
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196 | }
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197 | });
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198 | }
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199 | parser.hooks.evaluateTypeof.for(key).tap("DefinePlugin", expr => {
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200 | |
201 |
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202 |
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203 |
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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 | if (recurseTypeof) return;
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209 | recurseTypeof = true;
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210 | const typeofCode = isTypeof
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211 | ? toCode(code, parser)
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212 | : "typeof (" + toCode(code, parser) + ")";
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213 | const res = parser.evaluate(typeofCode);
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214 | recurseTypeof = false;
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215 | res.setRange(expr.range);
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216 | return res;
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217 | });
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218 | parser.hooks.typeof.for(key).tap("DefinePlugin", expr => {
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219 | const typeofCode = isTypeof
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220 | ? toCode(code, parser)
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221 | : "typeof (" + toCode(code, parser) + ")";
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222 | const res = parser.evaluate(typeofCode);
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223 | if (!res.isString()) return;
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224 | return ParserHelpers.toConstantDependency(
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225 | parser,
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226 | JSON.stringify(res.string)
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227 | ).bind(parser)(expr);
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228 | });
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229 | };
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230 |
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231 | |
232 |
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233 |
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234 |
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235 |
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236 |
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237 | const applyObjectDefine = (key, obj) => {
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238 | parser.hooks.canRename
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239 | .for(key)
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240 | .tap("DefinePlugin", ParserHelpers.approve);
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241 | parser.hooks.evaluateIdentifier
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242 | .for(key)
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243 | .tap("DefinePlugin", expr =>
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244 | new BasicEvaluatedExpression().setTruthy().setRange(expr.range)
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245 | );
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246 | parser.hooks.evaluateTypeof.for(key).tap("DefinePlugin", expr => {
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247 | return ParserHelpers.evaluateToString("object")(expr);
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248 | });
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249 | parser.hooks.expression.for(key).tap("DefinePlugin", expr => {
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250 | const strCode = stringifyObj(obj, parser);
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251 |
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252 | if (/__webpack_require__/.test(strCode)) {
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253 | return ParserHelpers.toConstantDependencyWithWebpackRequire(
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254 | parser,
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255 | strCode
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256 | )(expr);
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257 | } else {
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258 | return ParserHelpers.toConstantDependency(parser, strCode)(
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259 | expr
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260 | );
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261 | }
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262 | });
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263 | parser.hooks.typeof.for(key).tap("DefinePlugin", expr => {
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264 | return ParserHelpers.toConstantDependency(
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265 | parser,
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266 | JSON.stringify("object")
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267 | )(expr);
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268 | });
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269 | };
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270 |
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271 | walkDefinitions(definitions, "");
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272 | };
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273 |
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274 | normalModuleFactory.hooks.parser
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275 | .for("javascript/auto")
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276 | .tap("DefinePlugin", handler);
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277 | normalModuleFactory.hooks.parser
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278 | .for("javascript/dynamic")
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279 | .tap("DefinePlugin", handler);
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280 | normalModuleFactory.hooks.parser
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281 | .for("javascript/esm")
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282 | .tap("DefinePlugin", handler);
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283 | }
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284 | );
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285 | }
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286 | }
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287 | module.exports = DefinePlugin;
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