chore: remove unused vars and imports (#3682)

Author: ryouaki

packages/less/src/less-node/image-size.js

@@ -11,9 +11,7 @@ export default environment => {
             currentFileInfo.currentDirectory : currentFileInfo.entryPath;
 
         const fragmentStart = filePath.indexOf('#');
-        let fragment = '';
         if (fragmentStart !== -1) {
-            fragment = filePath.slice(fragmentStart);
             filePath = filePath.slice(0, fragmentStart);
         }
 

packages/less/src/less-node/index.js

@@ -4,7 +4,6 @@ import UrlFileManager from './url-file-manager';
 import createFromEnvironment from '../less';
 const less = createFromEnvironment(environment, [new FileManager(), new UrlFileManager()]);
 import lesscHelper from './lessc-helper';
-import path from 'path';
 
 // allow people to create less with their own environment
 less.createFromEnvironment = createFromEnvironment;

packages/less/src/less/tree/expression.js

@@ -2,8 +2,6 @@ import Node from './node';
 import Paren from './paren';
 import Comment from './comment';
 import Dimension from './dimension';
-import * as Constants from '../constants';
-const MATH = Constants.Math;
 
 const Expression = function(value, noSpacing) {
     this.value = value;