node-sass-selector-importer/dist/index.js

Custom importer for node-sass to import only certain CSS selectors instead of the whole file

"use strict";
const cssSelectorExtract = require("css-selector-extract");
const fs = require("fs");
const postcssSyntax = require("postcss-scss");
const toolbox_1 = require("node-sass-magic-importer/dist/toolbox");
module.exports = function selectorImporter() {
    return function importer(url, prev) {
        const nodeSassOptions = this.options;
        const selectorFilters = toolbox_1.parseSelectorFilters(url);
        if (selectorFilters.length === 0) {
            return null;
        }
        const includePaths = toolbox_1.buildIncludePaths(nodeSassOptions.includePaths, prev);
        const cleanedUrl = toolbox_1.cleanImportUrl(url);
        const resolvedUrl = toolbox_1.resolveUrl(cleanedUrl, includePaths);
        const css = fs.readFileSync(resolvedUrl, { encoding: `utf8` });
        const contents = cssSelectorExtract.processSync({
            css,
            filters: selectorFilters,
            postcssSyntax,
            preserveLines: true,
        });
        return contents ? {
            file: resolvedUrl,
            contents,
        } : null;
    };
};
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