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index.js
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index.js
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import path from "path";
import less from "less";
import { getOptions } from "loader-utils";
import { validate } from "schema-utils";
import schema from "./options.json";
import { getLessOptions, isUnsupportedUrl, normalizeSourceMap } from "./utils";
import LessError from "./LessError";
async function lessLoader(source) {
const options = getOptions(this);
validate(schema, options, {
name: "Less Loader",
baseDataPath: "options",
});
const callback = this.async();
const lessOptions = getLessOptions(this, options);
const useSourceMap =
typeof options.sourceMap === "boolean" ? options.sourceMap : this.sourceMap;
if (useSourceMap) {
lessOptions.sourceMap = {
outputSourceFiles: true,
};
}
let data = source;
if (typeof options.additionalData !== "undefined") {
data =
typeof options.additionalData === "function"
? `${await options.additionalData(data, this)}`
: `${options.additionalData}\n${data}`;
}
let result;
try {
result = await less.render(data, lessOptions);
} catch (error) {
if (error.filename) {
// `less` returns forward slashes on windows when `webpack` resolver return an absolute windows path in `WebpackFileManager`
// Ref: https://github.com/webpack-contrib/less-loader/issues/357
this.addDependency(path.normalize(error.filename));
}
callback(new LessError(error));
return;
}
const { css, imports } = result;
imports.forEach((item) => {
if (isUnsupportedUrl(item)) {
return;
}
// `less` return forward slashes on windows when `webpack` resolver return an absolute windows path in `WebpackFileManager`
// Ref: https://github.com/webpack-contrib/less-loader/issues/357
this.addDependency(path.normalize(item));
});
let map =
typeof result.map === "string" ? JSON.parse(result.map) : result.map;
if (map && useSourceMap) {
map = normalizeSourceMap(map, this.rootContext);
}
callback(null, css, map);
}
export default lessLoader;