mirror of https://github.com/webpack/webpack.git
129 lines
3.4 KiB
JavaScript
129 lines
3.4 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const Module = require("./Module");
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const OriginalSource = require("webpack-sources").OriginalSource;
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const RawSource = require("webpack-sources").RawSource;
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const WebpackMissingModule = require("./dependencies/WebpackMissingModule");
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const Template = require("./Template");
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class ExternalModule extends Module {
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constructor(request, type, userRequest) {
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super();
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this.request = request;
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this.userRequest = userRequest;
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this.type = type;
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this.built = false;
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this.external = true;
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}
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libIdent() {
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return this.userRequest;
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}
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chunkCondition(chunk) {
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return chunk.hasEntryModule();
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}
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identifier() {
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return "external " + JSON.stringify(this.request);
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}
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readableIdentifier() {
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return "external " + JSON.stringify(this.request);
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}
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needRebuild() {
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return false;
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}
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build(options, compilation, resolver, fs, callback) {
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this.builtTime = Date.now();
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callback();
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}
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getSourceForGlobalVariableExternal(variableName, type) {
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if(!Array.isArray(variableName)) {
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// make it an array as the look up works the same basically
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variableName = [variableName];
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}
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// needed for e.g. window["some"]["thing"]
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const objectLookup = variableName.map(r => `[${JSON.stringify(r)}]`).join("");
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return `(function() { module.exports = ${type}${objectLookup}; }());`;
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}
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getSourceForCommonJsExternal(moduleAndSpecifiers) {
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if(!Array.isArray(moduleAndSpecifiers)) {
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return `module.exports = require(${JSON.stringify(moduleAndSpecifiers)});`;
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}
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const moduleName = moduleAndSpecifiers[0];
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const objectLookup = moduleAndSpecifiers.slice(1).map(r => `[${JSON.stringify(r)}]`).join("");
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return `module.exports = require(${moduleName})${objectLookup};`;
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}
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checkExternalVariable(variableToCheck, request) {
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return `if(typeof ${variableToCheck} === 'undefined') {${WebpackMissingModule.moduleCode(request)}}\n`;
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}
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getSourceForAmdOrUmdExternal(id, optional, request) {
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const externalVariable = Template.toIdentifier(`__WEBPACK_EXTERNAL_MODULE_${id}__`);
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const missingModuleError = optional ? this.checkExternalVariable(externalVariable, request) : "";
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return `${missingModuleError}module.exports = ${externalVariable};`;
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}
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getSourceForDefaultCase(optional, request) {
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const missingModuleError = optional ? this.checkExternalVariable(request, request) : "";
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return `${missingModuleError}module.exports = ${request};`;
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}
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getSourceString() {
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const request = typeof this.request === "object" ? this.request[this.type] : this.request;
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switch(this.type) {
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case "this":
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case "window":
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case "global":
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return this.getSourceForGlobalVariableExternal(request, this.type);
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case "commonjs":
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case "commonjs2":
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return this.getSourceForCommonJsExternal(request);
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case "amd":
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case "umd":
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case "umd2":
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return this.getSourceForAmdOrUmdExternal(this.id, this.optional, request);
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default:
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return this.getSourceForDefaultCase(this.optional, request);
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}
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}
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getSource(sourceString) {
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if(this.useSourceMap) {
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return new OriginalSource(sourceString, this.identifier());
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}
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return new RawSource(sourceString);
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}
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source() {
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return this.getSource(
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this.getSourceString()
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);
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}
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size() {
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return 42;
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}
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updateHash(hash) {
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hash.update(this.type);
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hash.update(JSON.stringify(this.request));
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hash.update(JSON.stringify(this.optional));
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super.updateHash(hash);
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}
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}
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module.exports = ExternalModule;
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