index.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
var path = require("path");
var loaderUtils = require("loader-utils");
var validateOptions = require('schema-utils');
module.exports = function () {};
module.exports.pitch = function (request) {
if (this.cacheable) this.cacheable();
var options = loaderUtils.getOptions(this) || {};
validateOptions(require('./options.json'), options, 'Style Loader')
options.hmr = typeof options.hmr === 'undefined' ? true : options.hmr;
// The variable is needed, because the function should be inlined.
// If is just stored it in options, JSON.stringify will quote
// the function and it would be just a string at runtime
var insertInto;
if (typeof options.insertInto === "function") {
insertInto = options.insertInto.toString();
}
// We need to check if it a string, or variable will be "undefined"
// and the loader crashes
if (typeof options.insertInto === "string") {
insertInto = '"' + options.insertInto + '"';
}
var hmr = [
// Hot Module Replacement,
"if(module.hot) {",
// When the styles change, update the <style> tags
" module.hot.accept(" + loaderUtils.stringifyRequest(this, "!!" + request) + ", function() {",
" var newContent = require(" + loaderUtils.stringifyRequest(this, "!!" + request) + ");",
"",
" if(typeof newContent === 'string') newContent = [[module.id, newContent, '']];",
"",
" var locals = (function(a, b) {",
" var key, idx = 0;",
"",
" for(key in a) {",
" if(!b || a[key] !== b[key]) return false;",
" idx++;",
" }",
"",
" for(key in b) idx--;",
"",
" return idx === 0;",
" }(content.locals, newContent.locals));",
"",
// This error is caught and not shown and causes a full reload
" if(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');",
"",
" update(newContent);",
" });",
"",
// When the module is disposed, remove the <style> tags
" module.hot.dispose(function() { update(); });",
"}"
].join("\n");
return [
// Style Loader
// Adds CSS to the DOM by adding a <style> tag
"",
// Load styles
"var content = require(" + loaderUtils.stringifyRequest(this, "!!" + request) + ");",
"",
"if(typeof content === 'string') content = [[module.id, content, '']];",
"",
// Transform styles",
"var transform;",
"var insertInto;",
"",
options.transform ? "transform = require(" + loaderUtils.stringifyRequest(this, "!" + path.resolve(options.transform)) + ");" : "",
"",
"var options = " + JSON.stringify(options),
"",
"options.transform = transform",
"options.insertInto = " + insertInto + ";",
"",
// Add styles to the DOM
"var update = require(" + loaderUtils.stringifyRequest(this, "!" + path.join(__dirname, "lib", "addStyles.js")) + ")(content, options);",
"",
"if(content.locals) module.exports = content.locals;",
"",
options.hmr ? hmr : ""
].join("\n");
};