webpack/lib/LibraryTemplatePlugin.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jade, coffee, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
var SetVarMainTemplatePlugin = require("./SetVarMainTemplatePlugin");

function accessorToObjectAccess(accessor) {
	return accessor.map(function(a) {
		return "[" + JSON.stringify(a) + "]";
	}).join("");
}

function accessorAccess(base, accessor, joinWith) {
	accessor = [].concat(accessor);
	return accessor.map(function(a, idx) {
		a = base ? base + accessorToObjectAccess(accessor.slice(0, idx+1)) : accessor[0] + accessorToObjectAccess(accessor.slice(1, idx+1));
		if(idx === accessor.length - 1) return a;
		if(idx === 0 && typeof base === "undefined") return a + " = typeof " + a + " === \"object\" ? " + a + " : {}";
		return a + " = " + a + " || {}";
	}).join(joinWith || "; ");
}

function LibraryTemplatePlugin(name, target) {
	this.name = name;
	this.target = target;
}
module.exports = LibraryTemplatePlugin;
LibraryTemplatePlugin.prototype.apply = function(compiler) {
	compiler.plugin("this-compilation", function(compilation) {
		switch(this.target) {
		case "var":
			compilation.mainTemplate.apply(new SetVarMainTemplatePlugin("var " + accessorAccess(false, this.name)));
			break;
		case "assign":
			compilation.mainTemplate.apply(new SetVarMainTemplatePlugin(accessorAccess(undefined, this.name)));
			break;
		case "this":
		case "window":
		case "global":
			if(this.name)
				compilation.mainTemplate.apply(new SetVarMainTemplatePlugin(accessorAccess(this.target, this.name)));
			else
				compilation.mainTemplate.apply(new SetVarMainTemplatePlugin(this.target, true));
			break;
		case "commonjs":
			if(this.name)
				compilation.mainTemplate.apply(new SetVarMainTemplatePlugin(accessorAccess("exports", this.name)));
			else
				compilation.mainTemplate.apply(new SetVarMainTemplatePlugin("exports", true));
			break;
		case "commonjs2":
			compilation.mainTemplate.apply(new SetVarMainTemplatePlugin("module.exports"));
			break;
		case "amd":
			var AmdMainTemplatePlugin = require("./AmdMainTemplatePlugin");
			compilation.mainTemplate.apply(new AmdMainTemplatePlugin(this.name));
			break;
		case "umd":
		case "umd2":
			var UmdMainTemplatePlugin = require("./UmdMainTemplatePlugin");
			compilation.mainTemplate.apply(new UmdMainTemplatePlugin(this.name, this.target === "umd2"));
			break;
		case "jsonp":
			var JsonpExportMainTemplatePlugin = require("./JsonpExportMainTemplatePlugin");
			compilation.mainTemplate.apply(new JsonpExportMainTemplatePlugin(this.name));
			break;
		default:
			throw new Error(this.target + " is not a valid Library target");
		}
	}.bind(this));
};