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