1 |
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4 |
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5 | "use strict";
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6 |
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7 | const RuntimeGlobals = require("../RuntimeGlobals");
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8 | const Template = require("../Template");
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9 | const HelperRuntimeModule = require("./HelperRuntimeModule");
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10 |
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11 | class AsyncModuleRuntimeModule extends HelperRuntimeModule {
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12 | constructor() {
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13 | super("async module");
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14 | }
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15 |
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16 | |
17 |
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18 |
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19 | generate() {
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20 | const { runtimeTemplate } = this.compilation;
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21 | const fn = RuntimeGlobals.asyncModule;
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22 | return Template.asString([
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23 | 'var webpackThen = typeof Symbol === "function" ? Symbol("webpack then") : "__webpack_then__";',
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24 | 'var webpackExports = typeof Symbol === "function" ? Symbol("webpack exports") : "__webpack_exports__";',
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25 | `var completeQueue = ${runtimeTemplate.basicFunction("queue", [
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26 | "if(queue) {",
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27 | Template.indent([
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28 | `queue.forEach(${runtimeTemplate.expressionFunction(
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29 | "fn.r--",
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30 | "fn"
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31 | )});`,
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32 | `queue.forEach(${runtimeTemplate.expressionFunction(
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33 | "fn.r-- ? fn.r++ : fn()",
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34 | "fn"
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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 | `var completeFunction = ${runtimeTemplate.expressionFunction(
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40 | "!--fn.r && fn()",
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41 | "fn"
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42 | )};`,
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43 | `var queueFunction = ${runtimeTemplate.expressionFunction(
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44 | "queue ? queue.push(fn) : completeFunction(fn)",
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45 | "queue, fn"
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46 | )};`,
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47 | `var wrapDeps = ${runtimeTemplate.returningFunction(
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48 | `deps.map(${runtimeTemplate.basicFunction("dep", [
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49 | 'if(dep !== null && typeof dep === "object") {',
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50 | Template.indent([
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51 | "if(dep[webpackThen]) return dep;",
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52 | "if(dep.then) {",
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53 | Template.indent([
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54 | "var queue = [];",
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55 | `dep.then(${runtimeTemplate.basicFunction("r", [
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56 | "obj[webpackExports] = r;",
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57 | "completeQueue(queue);",
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58 | "queue = 0;"
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59 | ])});`,
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60 | `var obj = {};
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61 | obj[webpackThen] = ${runtimeTemplate.expressionFunction(
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62 | "queueFunction(queue, fn), dep.catch(reject)",
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63 | "fn, reject"
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64 | )};`,
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65 | "return obj;"
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66 | ]),
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67 | "}"
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68 | ]),
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69 | "}",
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70 | `var ret = {};
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71 | ret[webpackThen] = ${runtimeTemplate.expressionFunction(
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72 | "completeFunction(fn)",
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73 | "fn"
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74 | )};
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75 | ret[webpackExports] = dep;
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76 | return ret;`
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77 | ])})`,
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78 | "deps"
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79 | )};`,
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80 | `${fn} = ${runtimeTemplate.basicFunction("module, body, hasAwait", [
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81 | "var queue = hasAwait && [];",
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82 | "var exports = module.exports;",
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83 | "var currentDeps;",
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84 | "var outerResolve;",
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85 | "var reject;",
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86 | "var isEvaluating = true;",
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87 | "var nested = false;",
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88 | `var whenAll = ${runtimeTemplate.basicFunction(
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89 | "deps, onResolve, onReject",
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90 | [
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91 | "if (nested) return;",
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92 | "nested = true;",
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93 | "onResolve.r += deps.length;",
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94 | `deps.map(${runtimeTemplate.expressionFunction(
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95 | "dep[webpackThen](onResolve, onReject)",
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96 | "dep, i"
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97 | )});`,
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98 | "nested = false;"
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99 | ]
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100 | )};`,
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101 | `var promise = new Promise(${runtimeTemplate.basicFunction(
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102 | "resolve, rej",
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103 | [
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104 | "reject = rej;",
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105 | `outerResolve = ${runtimeTemplate.expressionFunction(
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106 | "resolve(exports), completeQueue(queue), queue = 0"
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107 | )};`
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108 | ]
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109 | )});`,
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110 | "promise[webpackExports] = exports;",
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111 | `promise[webpackThen] = ${runtimeTemplate.basicFunction(
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112 | "fn, rejectFn",
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113 | [
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114 | "if (isEvaluating) { return completeFunction(fn); }",
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115 | "if (currentDeps) whenAll(currentDeps, fn, rejectFn);",
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116 | "queueFunction(queue, fn);",
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117 | "promise.catch(rejectFn);"
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118 | ]
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119 | )};`,
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120 | "module.exports = promise;",
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121 | `body(${runtimeTemplate.basicFunction("deps", [
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122 | "if(!deps) return outerResolve();",
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123 | "currentDeps = wrapDeps(deps);",
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124 | "var fn, result;",
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125 | `var promise = new Promise(${runtimeTemplate.basicFunction(
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126 | "resolve, reject",
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127 | [
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128 | `fn = ${runtimeTemplate.expressionFunction(
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129 | `resolve(result = currentDeps.map(${runtimeTemplate.returningFunction(
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130 | "d[webpackExports]",
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131 | "d"
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132 | )}))`
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133 | )};`,
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134 | "fn.r = 0;",
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135 | "whenAll(currentDeps, fn, reject);"
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136 | ]
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137 | )});`,
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138 | "return fn.r ? promise : result;"
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139 | ])}).then(outerResolve, reject);`,
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140 | "isEvaluating = false;"
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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 = AsyncModuleRuntimeModule;
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