spawn-loader/index.js

/**
 * @author Eoin Hennessy
 * @author Erik Desjardins
 * See LICENSE file in root directory for full license.
 */

'use strict';

var SingleEntryPlugin = require('webpack/lib/SingleEntryPlugin');
var utils = require('loader-utils');

module.exports = function() {
	// ...
};

module.exports.pitch = function(request) {
	var query = utils.parseQuery(this.query);
	var compiler = createCompiler(this, request, {
		filename: query.name
	});
	runCompiler(compiler, this.async());
};

function runCompiler(compiler, callback) {
	compiler.runAsChild(function(error, entries) {
		if (error) {
			callback(error);
		} else if (entries[0]){
			var url = entries[0].files[0];
			callback(null, getSource(url));
		} else {
			callback(null, null);
		}
	});
}

function createCompiler(loader, request, options) {
	var compiler = getCompilation(loader).createChildCompiler('entry', options);
	var plugin = new SingleEntryPlugin(loader.context, '!!' + request, utils.interpolateName(loader, '[name]', {}));
	compiler.apply(plugin);
	var subCache = 'subcache ' + __dirname + ' ' + request;
	compiler.plugin('compilation', function(compilation) {
		if (!compilation.cache) {
			return;
		}
		if (!compilation.cache[subCache]) {
			compilation.cache[subCache] = {};
		}
		compilation.cache = compilation.cache[subCache];
	});
	return compiler;
}

function getSource(url) {
	return 'module.exports = __webpack_public_path__ + ' + JSON.stringify(url);
}

function getCompilation(loader) {
	return loader._compilation;
}