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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Joel Denning @joeldenning
*/
"use strict";
const { ConcatSource } = require("webpack-sources");
const { UsageState } = require("../ExportsInfo");
const ExternalModule = require("../ExternalModule");
const Template = require("../Template");
const propertyAccess = require("../util/propertyAccess");
const AbstractLibraryPlugin = require("./AbstractLibraryPlugin");
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../../declarations/WebpackOptions").LibraryOptions} LibraryOptions */
/** @typedef {import("../../declarations/WebpackOptions").LibraryType} LibraryType */
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../Compilation").ChunkHashContext} ChunkHashContext */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../javascript/JavascriptModulesPlugin").RenderContext} RenderContext */
/** @typedef {import("../util/Hash")} Hash */
/** @template T @typedef {import("./AbstractLibraryPlugin").LibraryContext<T>} LibraryContext<T> */
/**
* @typedef {Object} SystemLibraryPluginOptions
* @property {LibraryType} type
*/
/**
* @typedef {Object} SystemLibraryPluginParsed
* @property {string} name
*/
/**
* @typedef {SystemLibraryPluginParsed} T
* @extends {AbstractLibraryPlugin<SystemLibraryPluginParsed>}
*/
class SystemLibraryPlugin extends AbstractLibraryPlugin {
/**
* @param {SystemLibraryPluginOptions} options the plugin options
*/
constructor(options) {
super({
pluginName: "SystemLibraryPlugin",
type: options.type
});
}
/**
* @param {LibraryOptions} library normalized library option
* @returns {T | false} preprocess as needed by overriding
*/
parseOptions(library) {
const { name } = library;
if (name && typeof name !== "string") {
throw new Error(
`System.js library name must be a simple string or unset. ${AbstractLibraryPlugin.COMMON_LIBRARY_NAME_MESSAGE}`
);
}
return {
name: /** @type {string=} */ (name)
};
}
/**
* @param {Source} source source
* @param {RenderContext} renderContext render context
* @param {LibraryContext<T>} libraryContext context
* @returns {Source} source with library export
*/
render(source, { chunkGraph, moduleGraph, chunk }, { options, compilation }) {
const modules = chunkGraph
.getChunkModules(chunk)
.filter(m => m instanceof ExternalModule && m.externalType === "system");
const externals = /** @type {ExternalModule[]} */ (modules);
// The name this bundle should be registered as with System
const name = options.name
? `${JSON.stringify(compilation.getPath(options.name, { chunk }))}, `
: "";
// The array of dependencies that are external to webpack and will be provided by System
const systemDependencies = JSON.stringify(
externals.map(m =>
typeof m.request === "object" && !Array.isArray(m.request)
? m.request.amd
: m.request
)
);
// The name of the variable provided by System for exporting
const dynamicExport = "__WEBPACK_DYNAMIC_EXPORT__";
// An array of the internal variable names for the webpack externals
const externalWebpackNames = externals.map(
m =>
`__WEBPACK_EXTERNAL_MODULE_${Template.toIdentifier(
`${chunkGraph.getModuleId(m)}`
)}__`
);
// Declaring variables for the internal variable names for the webpack externals
const externalVarDeclarations = externalWebpackNames
.map(name => `var ${name} = {};`)
.join("\n");
// Define __esModule flag on all internal variables and helpers
const externalVarInitialization = [];
// The system.register format requires an array of setter functions for externals.
const setters =
externalWebpackNames.length === 0
? ""
: Template.asString([
"setters: [",
Template.indent(
externals
.map((module, i) => {
const external = externalWebpackNames[i];
const exportsInfo = moduleGraph.getExportsInfo(module);
const otherUnused =
exportsInfo.otherExportsInfo.getUsed(chunk.runtime) ===
UsageState.Unused;
const instructions = [];
const handledNames = [];
for (const exportInfo of exportsInfo.orderedExports) {
const used = exportInfo.getUsedName(
undefined,
chunk.runtime
);
if (used) {
if (otherUnused || used !== exportInfo.name) {
instructions.push(
`${external}${propertyAccess([
used
])} = module${propertyAccess([exportInfo.name])};`
);
handledNames.push(exportInfo.name);
}
} else {
handledNames.push(exportInfo.name);
}
}
if (!otherUnused) {
if (
!Array.isArray(module.request) ||
module.request.length === 1
) {
externalVarInitialization.push(
`Object.defineProperty(${external}, "__esModule", { value: true });`
);
}
if (handledNames.length > 0) {
const name = `${external}handledNames`;
externalVarInitialization.push(
`var ${name} = ${JSON.stringify(handledNames)};`
);
instructions.push(
Template.asString([
"Object.keys(module).forEach(function(key) {",
Template.indent([
`if(${name}.indexOf(key) >= 0)`,
Template.indent(`${external}[key] = module[key];`)
]),
"});"
])
);
} else {
instructions.push(
Template.asString([
"Object.keys(module).forEach(function(key) {",
Template.indent([`${external}[key] = module[key];`]),
"});"
])
);
}
}
if (instructions.length === 0) return "function() {}";
return Template.asString([
"function(module) {",
Template.indent(instructions),
"}"
]);
})
.join(",\n")
),
"],"
]);
return new ConcatSource(
Template.asString([
`System.register(${name}${systemDependencies}, function(${dynamicExport}, __system_context__) {`,
Template.indent([
externalVarDeclarations,
Template.asString(externalVarInitialization),
"return {",
Template.indent([
setters,
"execute: function() {",
Template.indent(`${dynamicExport}(`)
])
]),
""
]),
source,
Template.asString([
"",
Template.indent([
Template.indent([Template.indent([");"]), "}"]),
"};"
]),
"})"
])
);
}
/**
* @param {Chunk} chunk the chunk
* @param {Hash} hash hash
* @param {ChunkHashContext} chunkHashContext chunk hash context
* @param {LibraryContext<T>} libraryContext context
* @returns {void}
*/
chunkHash(chunk, hash, chunkHashContext, { options, compilation }) {
hash.update("SystemLibraryPlugin");
if (options.name) {
hash.update(compilation.getPath(options.name, { chunk }));
}
}
}
module.exports = SystemLibraryPlugin;