fix: deprecation warning (#415)

Author: cap-Bernardito

src/index.js

@@ -9,7 +9,11 @@ import LessError from "./LessError";
 async function lessLoader(source) {
  const options = this.getOptions(schema);
  const callback = this.async();
- const lessOptions = getLessOptions(this, options);
+ const webpackContextSymbol = Symbol("loaderContext");
+ const lessOptions = getLessOptions(this, {
+ ...options,
+ webpackContextSymbol,
+ });
  const useSourceMap =
  typeof options.sourceMap === "boolean" ? options.sourceMap : this.sourceMap;
 
@@ -44,9 +48,7 @@ async function lessLoader(source) {
  return;
  }
 
- if ("webpackLoaderContext" in less) {
- delete less.webpackLoaderContext;
- }
+ delete less[webpackContextSymbol];
 
  const { css, imports } = result;
 

src/utils.js

@@ -182,26 +182,27 @@ function getLessOptions(loaderContext, loaderOptions) {
  lessOptions.plugins.unshift(createWebpackLessPlugin(loaderContext));
  }
 
- const webpackContextDeprecated = util.deprecate(
- (context) => context,
- "less.webpackLoaderContext is deprecated and will be removed in next major release. Instead use pluginManager.webpackLoaderContext (https://webpack.js.org/loaders/less-loader/#plugins)"
- );
-
  lessOptions.plugins.unshift({
  install(lessProcessor, pluginManager) {
  // eslint-disable-next-line no-param-reassign
  pluginManager.webpackLoaderContext = loaderContext;
 
- // Todo remove in next major release
- if (typeof lessProcessor.webpackLoaderContext === "undefined") {
- Object.defineProperty(lessProcessor, "webpackLoaderContext", {
- configurable: true,
+ // Todo remove in next major release `lessProcessor[webpackContextSymbol]`
+ const { webpackContextSymbol } = options;
 
- get() {
- return webpackContextDeprecated(loaderContext);
- },
- });
- }
+ // eslint-disable-next-line no-param-reassign
+ lessProcessor[webpackContextSymbol] = loaderContext;
+
+ Object.defineProperty(lessProcessor, "webpackLoaderContext", {
+ configurable: true,
+
+ get() {
+ util.deprecate(() => {},
+ "less.webpackLoaderContext is deprecated and will be removed in next major release. Instead use pluginManager.webpackLoaderContext (https://webpack.js.org/loaders/less-loader/#plugins)")();
+
+ return lessProcessor[webpackContextSymbol];
+ },
+ });
  },
  });