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"use strict";
const path = require("path");
// libsass uses this precedence when importing files without extension
const extPrecedence = [".scss", ".sass", ".css"];
/**
* When libsass tries to resolve an import, it uses a special algorithm.
* Since the sass-loader uses webpack to resolve the modules, we need to simulate that algorithm. This function
* returns an array of import paths to try.
*
* @param {string} request
* @returns {Array<string>}
*/
function importsToResolve(request) {
// libsass' import algorithm works like this:
// In case there is no file extension...
// - Prefer modules starting with '_'.
// - File extension precedence: .scss, .sass, .css.
// In case there is a file extension...
// - If the file is a CSS-file, do not include it all, but just link it via @import url().
// - The exact file name must match (no auto-resolving of '_'-modules).
// Keep in mind: ext can also be something like '.datepicker' when the true extension is omitted and the filename contains a dot.
// @see https://github.com/webpack-contrib/sass-loader/issues/167
const ext = path.extname(request);
const basename = path.basename(request);
const dirname = path.dirname(request);
const startsWithUnderscore = basename.charAt(0) === "_";
const hasCssExt = ext === ".css";
const hasSassExt = ext === ".scss" || ext === ".sass";
// a module import is an identifier like 'bootstrap-sass'
// We also need to check for dirname since it might also be a deep import like 'bootstrap-sass/something'
let isModuleImport = request.charAt(0) !== "." && dirname === ".";
if (dirname.charAt(0) === "@") {
// Check whether it is a deep import from scoped npm package
// (i.e. @pkg/foo/file), if so, process import as file import;
// otherwise, if we import from root npm scoped package (i.e. @pkg/foo)
// process import as a module import.
isModuleImport = !(dirname.indexOf("/") > -1);
}
return (isModuleImport && [request]) || // Do not modify module imports
(hasCssExt && []) || // Do not import css files
(hasSassExt && [request]) || // Do not modify imports with explicit extensions
(startsWithUnderscore ? [] : extPrecedence) // Do not add underscore imports if there is already an underscore
.map(ext => "_" + basename + ext)
.concat(
extPrecedence.map(ext => basename + ext)
).map(
file => dirname + "/" + file // No path.sep required here, because imports inside SASS are usually with /
);
}
module.exports = importsToResolve;
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