refactor: moving processResult in index (#344)

src/formatLessError.js

@@ -1,5 +1,3 @@
-const os = require('os');
-
 /**
  * Tries to get an excerpt of the file where the error happened.
  * Uses err.line and err.column.
@@ -51,11 +49,11 @@ function formatLessError(err) {
   err.hideStack = true;
 
   err.message = [
-    os.EOL,
+    '\n',
     ...getFileExcerptIfPossible(err),
     msg.charAt(0).toUpperCase() + msg.slice(1),
     `      in ${err.filename} (line ${err.line}, column ${err.column})`,
-  ].join(os.EOL);
+  ].join('\n');
 
   return err;
 } /* eslint-enable no-param-reassign */

src/index.js

@@ -6,8 +6,9 @@ import { getOptions } from 'loader-utils';
 import validateOptions from 'schema-utils';
 
 import schema from './options.json';
-import processResult from './processResult';
 import getLessOptions from './getLessOptions';
+import removeSourceMappingUrl from './removeSourceMappingUrl';
+import formatLessError from './formatLessError';
 
 const render = promisify(less.render.bind(less));
 
@@ -22,7 +23,25 @@ function lessLoader(source) {
   const callback = this.async();
   const lessOptions = getLessOptions(this, options, source);
 
-  processResult(this, render(lessOptions.data, lessOptions), callback);
+  render(lessOptions.data, lessOptions)
+    .then(({ css, map, imports }) => {
+      imports.forEach(this.addDependency, this);
+
+      // Removing the sourceMappingURL comment.
+      // See removeSourceMappingUrl.js for the reasoning behind this.
+      callback(
+        null,
+        removeSourceMappingUrl(css),
+        typeof map === 'string' ? JSON.parse(map) : map
+      );
+    })
+    .catch((lessError) => {
+      if (lessError.filename) {
+        this.addDependency(lessError.filename);
+      }
+
+      callback(formatLessError(lessError));
+    });
 }
 
 export default lessLoader;