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ExternalModule.js
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Wed, Nov 6, 20:54

ExternalModule.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { OriginalSource, RawSource } = require("webpack-sources");
const ConcatenationScope = require("./ConcatenationScope");
const Module = require("./Module");
const RuntimeGlobals = require("./RuntimeGlobals");
const Template = require("./Template");
const StaticExportsDependency = require("./dependencies/StaticExportsDependency");
const extractUrlAndGlobal = require("./util/extractUrlAndGlobal");
const makeSerializable = require("./util/makeSerializable");
const propertyAccess = require("./util/propertyAccess");
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../declarations/WebpackOptions").WebpackOptionsNormalized} WebpackOptions */
/** @typedef {import("./Chunk")} Chunk */
/** @typedef {import("./ChunkGraph")} ChunkGraph */
/** @typedef {import("./Compilation")} Compilation */
/** @typedef {import("./Dependency").UpdateHashContext} UpdateHashContext */
/** @typedef {import("./DependencyTemplates")} DependencyTemplates */
/** @typedef {import("./Module").CodeGenerationContext} CodeGenerationContext */
/** @typedef {import("./Module").CodeGenerationResult} CodeGenerationResult */
/** @typedef {import("./Module").ConcatenationBailoutReasonContext} ConcatenationBailoutReasonContext */
/** @typedef {import("./Module").LibIdentOptions} LibIdentOptions */
/** @typedef {import("./Module").NeedBuildContext} NeedBuildContext */
/** @typedef {import("./RequestShortener")} RequestShortener */
/** @typedef {import("./ResolverFactory").ResolverWithOptions} ResolverWithOptions */
/** @typedef {import("./RuntimeTemplate")} RuntimeTemplate */
/** @typedef {import("./WebpackError")} WebpackError */
/** @typedef {import("./util/Hash")} Hash */
/** @typedef {import("./util/fs").InputFileSystem} InputFileSystem */
/**
* @typedef {Object} SourceData
* @property {boolean=} iife
* @property {string=} init
* @property {string} expression
*/
/**
* @param {string|string[]} variableName the variable name or path
* @param {string} type the module system
* @returns {SourceData} the generated source
*/
const getSourceForGlobalVariableExternal = (variableName, type) => {
if (!Array.isArray(variableName)) {
// make it an array as the look up works the same basically
variableName = [variableName];
}
// needed for e.g. window["some"]["thing"]
const objectLookup = variableName.map(r => `[${JSON.stringify(r)}]`).join("");
return {
iife: type === "this",
expression: `${type}${objectLookup}`
};
};
/**
* @param {string|string[]} moduleAndSpecifiers the module request
* @returns {SourceData} the generated source
*/
const getSourceForCommonJsExternal = moduleAndSpecifiers => {
if (!Array.isArray(moduleAndSpecifiers)) {
return {
expression: `require(${JSON.stringify(moduleAndSpecifiers)});`
};
}
const moduleName = moduleAndSpecifiers[0];
return {
expression: `require(${JSON.stringify(moduleName)})${propertyAccess(
moduleAndSpecifiers,
1
)};`
};
};
/**
* @param {string|string[]} moduleAndSpecifiers the module request
* @param {RuntimeTemplate} runtimeTemplate the runtime template
* @returns {SourceData} the generated source
*/
const getSourceForImportExternal = (moduleAndSpecifiers, runtimeTemplate) => {
const importName = runtimeTemplate.outputOptions.importFunctionName;
if (!runtimeTemplate.supportsDynamicImport() && importName === "import") {
throw new Error(
"The target environment doesn't support 'import()' so it's not possible to use external type 'import'"
);
}
if (!Array.isArray(moduleAndSpecifiers)) {
return {
expression: `${importName}(${JSON.stringify(moduleAndSpecifiers)});`
};
}
if (moduleAndSpecifiers.length === 1) {
return {
expression: `${importName}(${JSON.stringify(moduleAndSpecifiers[0])});`
};
}
const moduleName = moduleAndSpecifiers[0];
return {
expression: `${importName}(${JSON.stringify(
moduleName
)}).then(${runtimeTemplate.returningFunction(
`module${propertyAccess(moduleAndSpecifiers, 1)}`,
"module"
)});`
};
};
/**
* @param {string|string[]} urlAndGlobal the script request
* @param {RuntimeTemplate} runtimeTemplate the runtime template
* @returns {SourceData} the generated source
*/
const getSourceForScriptExternal = (urlAndGlobal, runtimeTemplate) => {
if (typeof urlAndGlobal === "string") {
urlAndGlobal = extractUrlAndGlobal(urlAndGlobal);
}
const url = urlAndGlobal[0];
const globalName = urlAndGlobal[1];
return {
init: "var error = new Error();",
expression: `new Promise(${runtimeTemplate.basicFunction(
"resolve, reject",
[
`if(typeof ${globalName} !== "undefined") return resolve();`,
`${RuntimeGlobals.loadScript}(${JSON.stringify(
url
)}, ${runtimeTemplate.basicFunction("event", [
`if(typeof ${globalName} !== "undefined") return resolve();`,
"var errorType = event && (event.type === 'load' ? 'missing' : event.type);",
"var realSrc = event && event.target && event.target.src;",
"error.message = 'Loading script failed.\\n(' + errorType + ': ' + realSrc + ')';",
"error.name = 'ScriptExternalLoadError';",
"error.type = errorType;",
"error.request = realSrc;",
"reject(error);"
])}, ${JSON.stringify(globalName)});`
]
)}).then(${runtimeTemplate.returningFunction(
`${globalName}${propertyAccess(urlAndGlobal, 2)}`
)})`
};
};
/**
* @param {string} variableName the variable name to check
* @param {string} request the request path
* @param {RuntimeTemplate} runtimeTemplate the runtime template
* @returns {string} the generated source
*/
const checkExternalVariable = (variableName, request, runtimeTemplate) => {
return `if(typeof ${variableName} === 'undefined') { ${runtimeTemplate.throwMissingModuleErrorBlock(
{ request }
)} }\n`;
};
/**
* @param {string|number} id the module id
* @param {boolean} optional true, if the module is optional
* @param {string|string[]} request the request path
* @param {RuntimeTemplate} runtimeTemplate the runtime template
* @returns {SourceData} the generated source
*/
const getSourceForAmdOrUmdExternal = (
id,
optional,
request,
runtimeTemplate
) => {
const externalVariable = `__WEBPACK_EXTERNAL_MODULE_${Template.toIdentifier(
`${id}`
)}__`;
return {
init: optional
? checkExternalVariable(
externalVariable,
Array.isArray(request) ? request.join(".") : request,
runtimeTemplate
)
: undefined,
expression: externalVariable
};
};
/**
* @param {boolean} optional true, if the module is optional
* @param {string|string[]} request the request path
* @param {RuntimeTemplate} runtimeTemplate the runtime template
* @returns {SourceData} the generated source
*/
const getSourceForDefaultCase = (optional, request, runtimeTemplate) => {
if (!Array.isArray(request)) {
// make it an array as the look up works the same basically
request = [request];
}
const variableName = request[0];
const objectLookup = propertyAccess(request, 1);
return {
init: optional
? checkExternalVariable(variableName, request.join("."), runtimeTemplate)
: undefined,
expression: `${variableName}${objectLookup}`
};
};
const TYPES = new Set(["javascript"]);
const RUNTIME_REQUIREMENTS = new Set([RuntimeGlobals.module]);
const RUNTIME_REQUIREMENTS_FOR_SCRIPT = new Set([
RuntimeGlobals.module,
RuntimeGlobals.loadScript
]);
const RUNTIME_REQUIREMENTS_CONCATENATED = new Set([]);
class ExternalModule extends Module {
constructor(request, type, userRequest) {
super("javascript/dynamic", null);
// Info from Factory
/** @type {string | string[] | Record<string, string | string[]>} */
this.request = request;
/** @type {string} */
this.externalType = type;
/** @type {string} */
this.userRequest = userRequest;
}
/**
* @returns {Set<string>} types available (do not mutate)
*/
getSourceTypes() {
return TYPES;
}
/**
* @param {LibIdentOptions} options options
* @returns {string | null} an identifier for library inclusion
*/
libIdent(options) {
return this.userRequest;
}
/**
* @param {Chunk} chunk the chunk which condition should be checked
* @param {Compilation} compilation the compilation
* @returns {boolean} true, if the chunk is ok for the module
*/
chunkCondition(chunk, { chunkGraph }) {
return chunkGraph.getNumberOfEntryModules(chunk) > 0;
}
/**
* @returns {string} a unique identifier of the module
*/
identifier() {
return "external " + JSON.stringify(this.request);
}
/**
* @param {RequestShortener} requestShortener the request shortener
* @returns {string} a user readable identifier of the module
*/
readableIdentifier(requestShortener) {
return "external " + JSON.stringify(this.request);
}
/**
* @param {NeedBuildContext} context context info
* @param {function(WebpackError=, boolean=): void} callback callback function, returns true, if the module needs a rebuild
* @returns {void}
*/
needBuild(context, callback) {
return callback(null, !this.buildMeta);
}
/**
* @param {WebpackOptions} options webpack options
* @param {Compilation} compilation the compilation
* @param {ResolverWithOptions} resolver the resolver
* @param {InputFileSystem} fs the file system
* @param {function(WebpackError=): void} callback callback function
* @returns {void}
*/
build(options, compilation, resolver, fs, callback) {
this.buildMeta = {
async: false,
exportsType: undefined
};
this.buildInfo = {
strict: this.externalType !== "this"
};
this.buildMeta.exportsType = "dynamic";
let canMangle = false;
this.clearDependenciesAndBlocks();
switch (this.externalType) {
case "system":
if (!Array.isArray(this.request) || this.request.length === 1) {
this.buildMeta.exportsType = "namespace";
canMangle = true;
}
break;
case "promise":
this.buildMeta.async = true;
break;
case "import":
this.buildMeta.async = true;
if (!Array.isArray(this.request) || this.request.length === 1) {
this.buildMeta.exportsType = "namespace";
canMangle = false;
}
break;
case "script":
this.buildMeta.async = true;
break;
}
this.addDependency(new StaticExportsDependency(true, canMangle));
callback();
}
/**
* @param {ConcatenationBailoutReasonContext} context context
* @returns {string | undefined} reason why this module can't be concatenated, undefined when it can be concatenated
*/
getConcatenationBailoutReason({ moduleGraph }) {
switch (this.externalType) {
case "amd":
case "amd-require":
case "umd":
case "umd2":
case "system":
case "jsonp":
return `${this.externalType} externals can't be concatenated`;
}
return undefined;
}
getSourceData(runtimeTemplate, moduleGraph, chunkGraph) {
const request =
typeof this.request === "object" && !Array.isArray(this.request)
? this.request[this.externalType]
: this.request;
switch (this.externalType) {
case "this":
case "window":
case "self":
return getSourceForGlobalVariableExternal(request, this.externalType);
case "global":
return getSourceForGlobalVariableExternal(
request,
runtimeTemplate.outputOptions.globalObject
);
case "commonjs":
case "commonjs2":
case "commonjs-module":
return getSourceForCommonJsExternal(request);
case "amd":
case "amd-require":
case "umd":
case "umd2":
case "system":
case "jsonp":
return getSourceForAmdOrUmdExternal(
chunkGraph.getModuleId(this),
this.isOptional(moduleGraph),
request,
runtimeTemplate
);
case "import":
return getSourceForImportExternal(request, runtimeTemplate);
case "script":
return getSourceForScriptExternal(request, runtimeTemplate);
case "module":
if (!runtimeTemplate.supportsEcmaScriptModuleSyntax()) {
throw new Error(
"The target environment doesn't support EcmaScriptModule syntax so it's not possible to use external type 'module'"
);
}
throw new Error("Module external type is not implemented yet");
case "var":
case "promise":
case "const":
case "let":
case "assign":
default:
return getSourceForDefaultCase(
this.isOptional(moduleGraph),
request,
runtimeTemplate
);
}
}
/**
* @param {CodeGenerationContext} context context for code generation
* @returns {CodeGenerationResult} result
*/
codeGeneration({
runtimeTemplate,
moduleGraph,
chunkGraph,
concatenationScope
}) {
const sourceData = this.getSourceData(
runtimeTemplate,
moduleGraph,
chunkGraph
);
let sourceString = sourceData.expression;
if (sourceData.iife)
sourceString = `(function() { return ${sourceString}; }())`;
if (concatenationScope) {
sourceString = `${runtimeTemplate.supportsConst() ? "const" : "var"} ${
ConcatenationScope.NAMESPACE_OBJECT_EXPORT
} = ${sourceString};`;
concatenationScope.registerNamespaceExport(
ConcatenationScope.NAMESPACE_OBJECT_EXPORT
);
} else {
sourceString = `module.exports = ${sourceString};`;
}
if (sourceData.init) sourceString = `${sourceData.init}\n${sourceString}`;
const sources = new Map();
if (this.useSourceMap || this.useSimpleSourceMap) {
sources.set(
"javascript",
new OriginalSource(sourceString, this.identifier())
);
} else {
sources.set("javascript", new RawSource(sourceString));
}
return {
sources,
runtimeRequirements: concatenationScope
? RUNTIME_REQUIREMENTS_CONCATENATED
: this.externalType === "script"
? RUNTIME_REQUIREMENTS_FOR_SCRIPT
: RUNTIME_REQUIREMENTS
};
}
/**
* @param {string=} type the source type for which the size should be estimated
* @returns {number} the estimated size of the module (must be non-zero)
*/
size(type) {
return 42;
}
/**
* @param {Hash} hash the hash used to track dependencies
* @param {UpdateHashContext} context context
* @returns {void}
*/
updateHash(hash, context) {
const { chunkGraph } = context;
hash.update(this.externalType);
hash.update(JSON.stringify(this.request));
hash.update(
JSON.stringify(Boolean(this.isOptional(chunkGraph.moduleGraph)))
);
super.updateHash(hash, context);
}
serialize(context) {
const { write } = context;
write(this.request);
write(this.externalType);
write(this.userRequest);
super.serialize(context);
}
deserialize(context) {
const { read } = context;
this.request = read();
this.externalType = read();
this.userRequest = read();
super.deserialize(context);
}
}
makeSerializable(ExternalModule, "webpack/lib/ExternalModule");
module.exports = ExternalModule;

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