loader.js
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"use strict";
const path = require("path");
const async = require("neo-async");
const formatSassError = require("./formatSassError");
const webpackImporter = require("./webpackImporter");
const normalizeOptions = require("./normalizeOptions");
const pify = require("pify");
const semver = require("semver");
let nodeSassJobQueue = null;
/**
* The sass-loader makes node-sass available to webpack modules.
*
* @this {LoaderContext}
* @param {string} content
*/
function sassLoader(content) {
const callback = this.async();
const isSync = typeof callback !== "function";
const self = this;
const resourcePath = this.resourcePath;
function addNormalizedDependency(file) {
// node-sass returns POSIX paths
self.dependency(path.normalize(file));
}
if (isSync) {
throw new Error("Synchronous compilation is not supported anymore. See https://github.com/webpack-contrib/sass-loader/issues/333");
}
const options = normalizeOptions(this, content, webpackImporter(
resourcePath,
pify(this.resolve.bind(this)),
addNormalizedDependency
));
// Skip empty files, otherwise it will stop webpack, see issue #21
if (options.data.trim() === "") {
callback(null, "");
return;
}
const render = getRenderFuncFromSassImpl(options.implementation || require("node-sass"));
render(options, (err, result) => {
if (err) {
formatSassError(err, this.resourcePath);
err.file && this.dependency(err.file);
callback(err);
return;
}
if (result.map && result.map !== "{}") {
result.map = JSON.parse(result.map);
// result.map.file is an optional property that provides the output filename.
// Since we don't know the final filename in the webpack build chain yet, it makes no sense to have it.
delete result.map.file;
// The first source is 'stdin' according to node-sass because we've used the data input.
// Now let's override that value with the correct relative path.
// Since we specified options.sourceMap = path.join(process.cwd(), "/sass.map"); in normalizeOptions,
// we know that this path is relative to process.cwd(). This is how node-sass works.
result.map.sources[0] = path.relative(process.cwd(), resourcePath);
// node-sass returns POSIX paths, that's why we need to transform them back to native paths.
// This fixes an error on windows where the source-map module cannot resolve the source maps.
// @see https://github.com/webpack-contrib/sass-loader/issues/366#issuecomment-279460722
result.map.sourceRoot = path.normalize(result.map.sourceRoot);
result.map.sources = result.map.sources.map(path.normalize);
} else {
result.map = null;
}
result.stats.includedFiles.forEach(addNormalizedDependency);
callback(null, result.css.toString(), result.map);
});
}
/**
* Verifies that the implementation and version of Sass is supported by this loader.
*
* @param {Object} module
* @returns {Function}
*/
function getRenderFuncFromSassImpl(module) {
const info = module.info;
const components = info.split("\t");
if (components.length < 2) {
throw new Error("Unknown Sass implementation \"" + info + "\".");
}
const implementation = components[0];
const version = components[1];
if (!semver.valid(version)) {
throw new Error("Invalid Sass version \"" + version + "\".");
}
if (implementation === "dart-sass") {
if (!semver.satisfies(version, "^1.3.0")) {
throw new Error("Dart Sass version " + version + " is incompatible with ^1.3.0.");
}
return module.render.bind(module);
} else if (implementation === "node-sass") {
if (!semver.satisfies(version, "^4.0.0")) {
throw new Error("Node Sass version " + version + " is incompatible with ^4.0.0.");
}
// There is an issue with node-sass when async custom importers are used
// See https://github.com/sass/node-sass/issues/857#issuecomment-93594360
// We need to use a job queue to make sure that one thread is always available to the UV lib
if (nodeSassJobQueue === null) {
const threadPoolSize = Number(process.env.UV_THREADPOOL_SIZE || 4);
nodeSassJobQueue = async.queue(module.render.bind(module), threadPoolSize - 1);
}
return nodeSassJobQueue.push.bind(nodeSassJobQueue);
}
throw new Error("Unknown Sass implementation \"" + implementation + "\".");
}
module.exports = sassLoader;