61 lines
2.0 KiB
JavaScript
61 lines
2.0 KiB
JavaScript
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"use strict";
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const path = require("path");
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const utils = require("loader-utils");
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const matchModuleImport = /^~([^\/]+|@[^\/]+[\/][^\/]+)$/;
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/**
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* When libsass tries to resolve an import, it uses a special algorithm.
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* Since the sass-loader uses webpack to resolve the modules, we need to simulate that algorithm. This function
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* returns an array of import paths to try. The last entry in the array is always the original url
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* to enable straight-forward webpack.config aliases.
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*
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* @param {string} url
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* @returns {Array<string>}
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*/
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function importsToResolve(url) {
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const request = utils.urlToRequest(url);
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// Keep in mind: ext can also be something like '.datepicker' when the true extension is omitted and the filename contains a dot.
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// @see https://github.com/webpack-contrib/sass-loader/issues/167
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const ext = path.extname(request);
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if (matchModuleImport.test(url)) {
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return [request, url];
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}
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// libsass' import algorithm works like this:
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// In case there is a file extension...
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// - If the file is a CSS-file, do not include it all, but just link it via @import url().
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// - The exact file name must match (no auto-resolving of '_'-modules).
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if (ext === ".css") {
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return [];
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}
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if (ext === ".scss" || ext === ".sass") {
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return [request, url];
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}
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// In case there is no file extension...
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// - Prefer modules starting with '_'.
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// - File extension precedence: .scss, .sass, .css.
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const basename = path.basename(request);
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if (basename.charAt(0) === "_") {
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return [
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`${ request }.scss`, `${ request }.sass`, `${ request }.css`,
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url
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];
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}
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const dirname = path.dirname(request);
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return [
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`${ dirname }/_${ basename }.scss`, `${ dirname }/_${ basename }.sass`, `${ dirname }/_${ basename }.css`,
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`${ request }.scss`, `${ request }.sass`, `${ request }.css`,
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url
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];
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}
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module.exports = importsToResolve;
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