normalizeOptions.js
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"use strict";
const os = require("os");
const utils = require("loader-utils");
const cloneDeep = require("clone-deep");
const path = require("path");
const proxyCustomImporters = require("./proxyCustomImporters");
/**
* Derives the sass options from the loader context and normalizes its values with sane defaults.
*
* Please note: If loaderContext.query is an options object, it will be re-used across multiple invocations.
* That's why we must not modify the object directly.
*
* @param {LoaderContext} loaderContext
* @param {string} content
* @param {Function} webpackImporter
* @returns {Object}
*/
function normalizeOptions(loaderContext, content, webpackImporter) {
const options = cloneDeep(utils.getOptions(loaderContext)) || {};
const resourcePath = loaderContext.resourcePath;
options.data = options.data ? (options.data + os.EOL + content) : content;
// opt.outputStyle
if (!options.outputStyle && loaderContext.minimize) {
options.outputStyle = "compressed";
}
// opt.sourceMap
// Not using the `this.sourceMap` flag because css source maps are different
// @see https://github.com/webpack/css-loader/pull/40
if (options.sourceMap) {
// Deliberately overriding the sourceMap option here.
// node-sass won't produce source maps if the data option is used and options.sourceMap is not a string.
// In case it is a string, options.sourceMap should be a path where the source map is written.
// But since we're using the data option, the source map will not actually be written, but
// all paths in sourceMap.sources will be relative to that path.
// Pretty complicated... :(
options.sourceMap = path.join(process.cwd(), "/sass.map");
if ("sourceMapRoot" in options === false) {
options.sourceMapRoot = process.cwd();
}
if ("omitSourceMapUrl" in options === false) {
// The source map url doesn't make sense because we don't know the output path
// The css-loader will handle that for us
options.omitSourceMapUrl = true;
}
if ("sourceMapContents" in options === false) {
// If sourceMapContents option is not set, set it to true otherwise maps will be empty/null
// when exported by webpack-extract-text-plugin.
options.sourceMapContents = true;
}
}
// indentedSyntax is a boolean flag.
const ext = path.extname(resourcePath);
// If we are compiling sass and indentedSyntax isn't set, automatically set it.
if (ext && ext.toLowerCase() === ".sass" && "indentedSyntax" in options === false) {
options.indentedSyntax = true;
} else {
options.indentedSyntax = Boolean(options.indentedSyntax);
}
// Allow passing custom importers to `node-sass`. Accepts `Function` or an array of `Function`s.
options.importer = options.importer ? proxyCustomImporters(options.importer, resourcePath) : [];
options.importer.push(webpackImporter);
// `node-sass` uses `includePaths` to resolve `@import` paths. Append the currently processed file.
options.includePaths = options.includePaths || [];
options.includePaths.push(path.dirname(resourcePath));
return options;
}
module.exports = normalizeOptions;