/
normalizeOptions.js
97 lines (81 loc) · 3.38 KB
/
normalizeOptions.js
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'use strict';
const os = require('os');
const path = require('path');
const utils = require('loader-utils');
const cloneDeep = require('clone-deep');
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;
// allow opt.functions to be configured WRT loaderContext
if (typeof options.functions === 'function') {
options.functions = options.functions(loaderContext);
}
let { data } = options;
if (typeof options.data === 'function') {
data = options.data(loaderContext);
}
options.data = data ? 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;