125 lines
4.6 KiB
JavaScript
125 lines
4.6 KiB
JavaScript
"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;
|