loader.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
var fs = require("fs");
var loaderUtils = require("loader-utils");
var NodeTemplatePlugin = require("webpack/lib/node/NodeTemplatePlugin");
var NodeTargetPlugin = require("webpack/lib/node/NodeTargetPlugin");
var LibraryTemplatePlugin = require("webpack/lib/LibraryTemplatePlugin");
var SingleEntryPlugin = require("webpack/lib/SingleEntryPlugin");
var LimitChunkCountPlugin = require("webpack/lib/optimize/LimitChunkCountPlugin");
var NS = fs.realpathSync(__dirname);
module.exports = function(source) {
if(this.cacheable) this.cacheable();
return source;
};
module.exports.pitch = function(request) {
if(this.cacheable) this.cacheable();
var query = loaderUtils.parseQuery(this.query);
var loaders = this.loaders.slice(this.loaderIndex + 1);
this.addDependency(this.resourcePath);
// We already in child compiler, return empty bundle
if(this[NS] === undefined) {
throw new Error(
'"extract-text-webpack-plugin" loader is used without the corresponding plugin, ' +
'refer to https://github.com/webpack/extract-text-webpack-plugin for the usage example'
);
} else if(this[NS] === false) {
return "";
} else if(this[NS](null, query)) {
if(query.omit) {
this.loaderIndex += +query.omit + 1;
request = request.split("!").slice(+query.omit).join("!");
loaders = loaders.slice(+query.omit);
}
var resultSource;
if(query.remove) {
resultSource = "// removed by extract-text-webpack-plugin";
} else {
resultSource = undefined;
}
var childFilename = "extract-text-webpack-plugin-output-filename"; // eslint-disable-line no-path-concat
var publicPath = typeof query.publicPath === "string" ? query.publicPath : this._compilation.outputOptions.publicPath;
var outputOptions = {
filename: childFilename,
publicPath: publicPath
};
var childCompiler = this._compilation.createChildCompiler("extract-text-webpack-plugin", outputOptions);
childCompiler.apply(new NodeTemplatePlugin(outputOptions));
childCompiler.apply(new LibraryTemplatePlugin(null, "commonjs2"));
childCompiler.apply(new NodeTargetPlugin());
childCompiler.apply(new SingleEntryPlugin(this.context, "!!" + request));
childCompiler.apply(new LimitChunkCountPlugin({ maxChunks: 1 }));
var subCache = "subcache " + NS + " " + request; // eslint-disable-line no-path-concat
childCompiler.plugin("compilation", function(compilation) {
if(compilation.cache) {
if(!compilation.cache[subCache])
compilation.cache[subCache] = {};
compilation.cache = compilation.cache[subCache];
}
});
// We set loaderContext[NS] = false to indicate we already in
// a child compiler so we don't spawn another child compilers from there.
childCompiler.plugin("this-compilation", function(compilation) {
compilation.plugin("normal-module-loader", function(loaderContext, module) {
loaderContext[NS] = false;
if (module.request === request) {
module.loaders = loaders.map(function(loader) {
return {
loader: loader.path,
options: loader.options
};
});
}
});
});
var source;
childCompiler.plugin("after-compile", function(compilation, callback) {
source = compilation.assets[childFilename] && compilation.assets[childFilename].source();
// Remove all chunk assets
compilation.chunks.forEach(function(chunk) {
chunk.files.forEach(function(file) {
delete compilation.assets[file];
});
});
callback();
});
var callback = this.async();
childCompiler.runAsChild(function(err, entries, compilation) {
if(err) return callback(err);
if(compilation.errors.length > 0) {
return callback(compilation.errors[0]);
}
compilation.fileDependencies.forEach(function(dep) {
this.addDependency(dep);
}, this);
compilation.contextDependencies.forEach(function(dep) {
this.addContextDependency(dep);
}, this);
if(!source) {
return callback(new Error("Didn't get a result from child compiler"));
}
try {
var text = this.exec(source, request);
if(typeof text === "string")
text = [[0, text]];
text.forEach(function(item) {
var id = item[0];
compilation.modules.forEach(function(module) {
if(module.id === id)
item[0] = module.identifier();
});
});
this[NS](text, query);
if(text.locals && typeof resultSource !== "undefined") {
resultSource += "\nmodule.exports = " + JSON.stringify(text.locals) + ";";
}
} catch(e) {
return callback(e);
}
if(resultSource)
callback(null, resultSource);
else
callback();
}.bind(this));
}
};