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index.js
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index.js
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import path from "path";
import { validate } from "schema-utils";
import { getOptions } from "loader-utils";
import schema from "./options.json";
import {
getSassImplementation,
getSassOptions,
getWebpackImporter,
getRenderFunctionFromSassImplementation,
normalizeSourceMap,
} from "./utils";
import SassError from "./SassError";
/**
* The sass-loader makes node-sass and dart-sass available to webpack modules.
*
* @this {object}
* @param {string} content
*/
async function loader(content) {
const options = getOptions(this);
validate(schema, options, {
name: "Sass Loader",
baseDataPath: "options",
});
const callback = this.async();
const implementation = getSassImplementation(this, options.implementation);
if (!implementation) {
callback();
return;
}
const useSourceMap =
typeof options.sourceMap === "boolean" ? options.sourceMap : this.sourceMap;
const sassOptions = await getSassOptions(
this,
options,
content,
implementation,
useSourceMap
);
const shouldUseWebpackImporter =
typeof options.webpackImporter === "boolean"
? options.webpackImporter
: true;
if (shouldUseWebpackImporter) {
const { includePaths } = sassOptions;
sassOptions.importer.push(
getWebpackImporter(this, implementation, includePaths)
);
}
const render = getRenderFunctionFromSassImplementation(implementation);
render(sassOptions, (error, result) => {
if (error) {
// There are situations when the `file` property do not exist
if (error.file) {
// `node-sass` returns POSIX paths
this.addDependency(path.normalize(error.file));
}
callback(new SassError(error));
return;
}
let map = result.map ? JSON.parse(result.map) : null;
// Modify source paths only for webpack, otherwise we do nothing
if (map && useSourceMap) {
map = normalizeSourceMap(map, this.rootContext);
}
result.stats.includedFiles.forEach((includedFile) => {
const normalizedIncludedFile = path.normalize(includedFile);
// Custom `importer` can return only `contents` so includedFile will be relative
if (path.isAbsolute(normalizedIncludedFile)) {
this.addDependency(normalizedIncludedFile);
}
});
callback(null, result.css.toString(), map);
});
}
export default loader;