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4 years ago
/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Joel Denning @joeldenning
*/
"use strict";
const { ConcatSource } = require("webpack-sources");
const Template = require("./Template");
/** @typedef {import("./Compilation")} Compilation */
/**
* @typedef {Object} SystemMainTemplatePluginOptions
* @param {string=} name the library name
*/
class SystemMainTemplatePlugin {
/**
* @param {SystemMainTemplatePluginOptions} options the plugin options
*/
constructor(options) {
this.name = options.name;
}
/**
* @param {Compilation} compilation the compilation instance
* @returns {void}
*/
apply(compilation) {
const { mainTemplate, chunkTemplate } = compilation;
const onRenderWithEntry = (source, chunk, hash) => {
const externals = chunk.getModules().filter(m => m.external);
// The name this bundle should be registered as with System
const name = this.name
? `${JSON.stringify(
mainTemplate.getAssetPath(this.name, { hash, chunk })
)}, `
: "";
// The array of dependencies that are external to webpack and will be provided by System
const systemDependencies = JSON.stringify(
externals.map(m =>
typeof m.request === "object" ? m.request.amd : m.request
)
);
// The name of the variable provided by System for exporting
const dynamicExport = "__WEBPACK_DYNAMIC_EXPORT__";
// An array of the internal variable names for the webpack externals
const externalWebpackNames = externals.map(
m => `__WEBPACK_EXTERNAL_MODULE_${Template.toIdentifier(`${m.id}`)}__`
);
// Declaring variables for the internal variable names for the webpack externals
const externalVarDeclarations =
externalWebpackNames.length > 0
? `var ${externalWebpackNames.join(", ")};`
: "";
// The system.register format requires an array of setter functions for externals.
const setters =
externalWebpackNames.length === 0
? ""
: Template.asString([
"setters: [",
Template.indent(
externalWebpackNames
.map(external =>
Template.asString([
"function(module) {",
Template.indent(`${external} = module;`),
"}"
])
)
.join(",\n")
),
"],"
]);
return new ConcatSource(
Template.asString([
`System.register(${name}${systemDependencies}, function(${dynamicExport}) {`,
Template.indent([
externalVarDeclarations,
"return {",
Template.indent([
setters,
"execute: function() {",
Template.indent(`${dynamicExport}(`)
])
])
]) + "\n",
source,
"\n" +
Template.asString([
Template.indent([
Template.indent([Template.indent([");"]), "}"]),
"};"
]),
"})"
])
);
};
for (const template of [mainTemplate, chunkTemplate]) {
template.hooks.renderWithEntry.tap(
"SystemMainTemplatePlugin",
onRenderWithEntry
);
}
mainTemplate.hooks.globalHashPaths.tap(
"SystemMainTemplatePlugin",
paths => {
if (this.name) {
paths.push(this.name);
}
return paths;
}
);
mainTemplate.hooks.hash.tap("SystemMainTemplatePlugin", hash => {
hash.update("exports system");
if (this.name) {
hash.update(this.name);
}
});
}
}
module.exports = SystemMainTemplatePlugin;