96 lines
3.7 KiB
JavaScript
96 lines
3.7 KiB
JavaScript
"use strict";
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const path = require("path");
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const async = require("neo-async");
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const formatSassError = require("./formatSassError");
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const webpackImporter = require("./webpackImporter");
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const normalizeOptions = require("./normalizeOptions");
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const pify = require("pify");
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// This queue makes sure node-sass leaves one thread available for executing
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// fs tasks when running the custom importer code.
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// This can be removed as soon as node-sass implements a fix for this.
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const threadPoolSize = process.env.UV_THREADPOOL_SIZE || 4;
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let asyncSassJobQueue = null;
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/**
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* The sass-loader makes node-sass available to webpack modules.
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*
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* @this {LoaderContext}
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* @param {string} content
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*/
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function sassLoader(content) {
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if (asyncSassJobQueue === null) {
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const sass = require("node-sass");
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const sassVersion = /^(\d+)/.exec(require("node-sass/package.json").version).pop();
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if (Number(sassVersion) < 4) {
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throw new Error(
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"The installed version of `node-sass` is not compatible (expected: >= 4, actual: " + sassVersion + ")."
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);
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}
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asyncSassJobQueue = async.queue(sass.render, threadPoolSize - 1);
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}
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const callback = this.async();
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const isSync = typeof callback !== "function";
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const self = this;
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const resourcePath = this.resourcePath;
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function addNormalizedDependency(file) {
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// node-sass returns POSIX paths
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self.dependency(path.normalize(file));
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}
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if (isSync) {
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throw new Error("Synchronous compilation is not supported anymore. See https://github.com/webpack-contrib/sass-loader/issues/333");
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}
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const options = normalizeOptions(this, content, webpackImporter(
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resourcePath,
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pify(this.resolve.bind(this)),
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addNormalizedDependency
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));
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// Skip empty files, otherwise it will stop webpack, see issue #21
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if (options.data.trim() === "") {
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callback(null, "");
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return;
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}
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// start the actual rendering
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asyncSassJobQueue.push(options, (err, result) => {
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if (err) {
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formatSassError(err, this.resourcePath);
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err.file && this.dependency(err.file);
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callback(err);
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return;
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}
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if (result.map && result.map !== "{}") {
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result.map = JSON.parse(result.map);
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// result.map.file is an optional property that provides the output filename.
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// Since we don't know the final filename in the webpack build chain yet, it makes no sense to have it.
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delete result.map.file;
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// The first source is 'stdin' according to node-sass because we've used the data input.
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// Now let's override that value with the correct relative path.
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// Since we specified options.sourceMap = path.join(process.cwd(), "/sass.map"); in normalizeOptions,
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// we know that this path is relative to process.cwd(). This is how node-sass works.
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result.map.sources[0] = path.relative(process.cwd(), resourcePath);
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// node-sass returns POSIX paths, that's why we need to transform them back to native paths.
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// This fixes an error on windows where the source-map module cannot resolve the source maps.
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// @see https://github.com/webpack-contrib/sass-loader/issues/366#issuecomment-279460722
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result.map.sourceRoot = path.normalize(result.map.sourceRoot);
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result.map.sources = result.map.sources.map(path.normalize);
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} else {
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result.map = null;
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}
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result.stats.includedFiles.forEach(addNormalizedDependency);
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callback(null, result.css.toString(), result.map);
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});
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}
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module.exports = sassLoader;
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