diff --git a/.gitignore b/.gitignore
index c4061e4..9bdffbe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,7 @@
 .vscode
 node_modules/
 dist
-benchmark
-bin
+test
 
 *.sublime-project
 *.sublime-workspace
diff --git a/build.js b/build.js
new file mode 100644
index 0000000..87cb73b
--- /dev/null
+++ b/build.js
@@ -0,0 +1,12 @@
+import Es from 'esbuild'
+import fs from 'iofs'
+
+Es.buildSync({
+  entryPoints: ['src/less-node/index.js'],
+  outdir: 'dist',
+  platform: 'node',
+  format: 'esm',
+  // minify: true,
+  bundle: true,
+  target: 'node12'
+})
diff --git a/build/banner.js b/build/banner.js
deleted file mode 100644
index aea4a6e..0000000
--- a/build/banner.js
+++ /dev/null
@@ -1,14 +0,0 @@
-import pkg from './../package.json' assert { type: 'json' }
-
-export default `/**
- * Less - ${pkg.description} v${pkg.version}
- * http://lesscss.org
- * 
- * Copyright (c) 2009-${new Date().getFullYear()}, ${pkg.author.name} <${
-  pkg.author.email
-}>
- * Licensed under the ${pkg.license} License.
- *
- * @license ${pkg.license}
- */
-`
diff --git a/build/rollup.js b/build/rollup.js
deleted file mode 100644
index f0c6c52..0000000
--- a/build/rollup.js
+++ /dev/null
@@ -1,90 +0,0 @@
-import rollup from 'rollup'
-import typescript from 'rollup-plugin-typescript2'
-import commonjs from '@rollup/plugin-commonjs'
-import json from '@rollup/plugin-json'
-import resolve from '@rollup/plugin-node-resolve'
-import terser from 'rollup-plugin-terser'
-import banner from './banner'
-import path from 'path')
-
-const rootPath = path.join(__dirname, '..')
-
-import minimist from 'minimist' 
-
-const args = minimist(process.argv.slice(2))
-
-let outDir = args.dist ? './dist' : './tmp'
-
-async function buildBrowser() {
-  let bundle = await rollup.rollup({
-    input: './src/less-browser/bootstrap.js',
-    output: [
-      {
-        file: 'less.js',
-        format: 'umd'
-      },
-      {
-        file: 'less.min.js',
-        format: 'umd'
-      }
-    ],
-    plugins: [
-      resolve(),
-      commonjs(),
-      json(),
-      typescript({
-        verbosity: 2,
-        tsconfigDefaults: {
-          compilerOptions: {
-            allowJs: true,
-            sourceMap: true,
-            target: 'ES5'
-          }
-        },
-        include: ['*.ts', '**/*.ts', '*.js', '**/*.js'],
-        exclude: ['node_modules'] // only transpile our source code
-      }),
-      terser({
-        compress: true,
-        include: [/^.+\.min\.js$/],
-        output: {
-          comments: function (node, comment) {
-            if (comment.type == 'comment2') {
-              // preserve banner
-              return /@license/i.test(comment.value)
-            }
-          }
-        }
-      })
-    ]
-  })
-
-  if (!args.out || args.out.indexOf('less.js') > -1) {
-    const file = args.out || `${outDir}/less.js`
-    console.log(`Writing ${file}...`)
-    await bundle.write({
-      file: path.join(rootPath, file),
-      format: 'umd',
-      name: 'less',
-      banner
-    })
-  }
-
-  if (!args.out || args.out.indexOf('less.min.js') > -1) {
-    const file = args.out || `${outDir}/less.min.js`
-    console.log(`Writing ${file}...`)
-    await bundle.write({
-      file: path.join(rootPath, file),
-      format: 'umd',
-      name: 'less',
-      sourcemap: true,
-      banner
-    })
-  }
-}
-
-async function build() {
-  await buildBrowser()
-}
-
-build()
diff --git a/index.js b/index.js
deleted file mode 100644
index 7c440d5..0000000
--- a/index.js
+++ /dev/null
@@ -1 +0,0 @@
-export default './lib/less-node'
diff --git a/package.json b/package.json
index fcaaf43..4df0bb8 100644
--- a/package.json
+++ b/package.json
@@ -1,101 +1,24 @@
 {
-  "name": "less",
-  "version": "4.1.3",
-  "description": "Leaner CSS",
+  "name": "@bytedo/less",
+  "version": "0.0.1",
+  "type": "module",
+  "description": "less精简版",
   "homepage": "http://lesscss.org",
-  "author": {
-    "name": "Alexis Sellier",
-    "email": "self@cloudhead.net"
-  },
+  "author": "yutent",
   "contributors": [
     "The Core Less Team"
   ],
   "repository": {
     "type": "git",
-    "url": "https://github.com/less/less.js.git"
+    "url": "https://github.com/bytedo/less.git"
   },
   "license": "Apache-2.0",
-  "bin": {
-    "lessc": "./bin/lessc"
-  },
-  "main": "index",
-  "module": "./lib/less-node/index",
-  "directories": {
-    "test": "./test"
-  },
-  "browser": "./dist/less.js",
-  "engines": {
-    "node": ">=6"
-  },
+  "main": "dist/index.js",
+  "files": [
+    "dist/*"
+  ],
   "scripts": {
-    "test": "grunt test",
-    "grunt": "grunt",
-    "lint": "eslint '**/*.{ts,js}'",
-    "lint:fix": "eslint '**/*.{ts,js}' --fix",
-    "build": "npm-run-all clean compile",
-    "clean": "shx rm -rf ./lib tsconfig.tsbuildinfo",
-    "compile": "tsc -p tsconfig.build.json",
-    "copy:root": "shx cp -rf ./dist ../../",
-    "dev": "tsc -p tsconfig.build.json -w",
-    "prepublishOnly": "grunt dist"
-  },
-  "optionalDependencies": {
-    "errno": "^0.1.1",
-    "graceful-fs": "^4.1.2",
-    "image-size": "~0.5.0",
-    "make-dir": "^2.1.0",
-    "mime": "^1.4.1",
-    "needle": "^3.1.0",
-    "source-map": "~0.6.0"
-  },
-  "devDependencies": {
-    "@less/test-data": "^4.1.0",
-    "@less/test-import-module": "^4.0.0",
-    "@rollup/plugin-commonjs": "^17.0.0",
-    "@rollup/plugin-json": "^4.1.0",
-    "@rollup/plugin-node-resolve": "^11.0.0",
-    "@typescript-eslint/eslint-plugin": "^4.28.0",
-    "@typescript-eslint/parser": "^4.28.0",
-    "benny": "^3.6.12",
-    "bootstrap-less-port": "0.3.0",
-    "chai": "^4.2.0",
-    "cross-env": "^7.0.3",
-    "diff": "^3.2.0",
-    "eslint": "^7.29.0",
-    "fs-extra": "^8.1.0",
-    "git-rev": "^0.2.1",
-    "globby": "^10.0.1",
-    "grunt": "^1.0.4",
-    "grunt-cli": "^1.3.2",
-    "grunt-contrib-clean": "^1.0.0",
-    "grunt-contrib-connect": "^1.0.2",
-    "grunt-eslint": "^23.0.0",
-    "grunt-saucelabs": "^9.0.1",
-    "grunt-shell": "^1.3.0",
-    "html-template-tag": "^3.2.0",
-    "jit-grunt": "^0.10.0",
-    "less-plugin-autoprefix": "^1.5.1",
-    "less-plugin-clean-css": "^1.5.1",
-    "minimist": "^1.2.0",
-    "mocha": "^6.2.1",
-    "mocha-headless-chrome": "^4.0.0",
-    "mocha-teamcity-reporter": "^3.0.0",
-    "nock": "^11.8.2",
-    "npm-run-all": "^4.1.5",
-    "performance-now": "^0.2.0",
-    "phin": "^2.2.3",
-    "promise": "^7.1.1",
-    "read-glob": "^3.0.0",
-    "resolve": "^1.17.0",
-    "rollup": "^2.52.2",
-    "rollup-plugin-terser": "^5.1.1",
-    "rollup-plugin-typescript2": "^0.29.0",
-    "semver": "^6.3.0",
-    "shx": "^0.3.2",
-    "time-grunt": "^1.3.0",
-    "ts-node": "^9.1.1",
-    "typescript": "^4.3.4",
-    "uikit": "2.27.4"
+    "build": "node build.js"
   },
   "keywords": [
     "compile less",
@@ -121,9 +44,5 @@
     "stylesheet",
     "variables in css",
     "css less"
-  ],
-  "dependencies": {
-    "copy-anything": "^2.0.1",
-    "parse-node-version": "^1.0.1"
-  }
+  ]
 }
diff --git a/src/less-node/file-manager.js b/src/less-node/file-manager.js
index a4d2f7c..588002a 100644
--- a/src/less-node/file-manager.js
+++ b/src/less-node/file-manager.js
@@ -1,16 +1,15 @@
 import path from 'path'
-import fs from './fs'
+import fs from 'fs'
 import AbstractFileManager from '../less/environment/abstract-file-manager.js'
 
-const FileManager = function () {}
-FileManager.prototype = Object.assign(new AbstractFileManager(), {
+export default class FileManager extends AbstractFileManager {
   supports() {
     return true
-  },
+  }
 
   supportsSync() {
     return true
-  },
+  }
 
   loadFile(filename, currentDirectory, options, environment, callback) {
     let fullFilename
@@ -142,12 +141,10 @@ FileManager.prototype = Object.assign(new AbstractFileManager(), {
         }
       })(0)
     }
-  },
+  }
 
   loadFileSync(filename, currentDirectory, options, environment) {
     options.syncImport = true
     return this.loadFile(filename, currentDirectory, options, environment)
   }
-})
-
-export default FileManager
+}
diff --git a/src/less-node/fs.js b/src/less-node/fs.js
deleted file mode 100644
index c5063bf..0000000
--- a/src/less-node/fs.js
+++ /dev/null
@@ -1,6 +0,0 @@
-
-export default fs from 'graceful-fs'
-
-// export default fs from 'fs'
-
-
diff --git a/src/less-node/index.js b/src/less-node/index.js
index e073813..b01a3ea 100644
--- a/src/less-node/index.js
+++ b/src/less-node/index.js
@@ -1,20 +1,17 @@
-import environment from './environment'
+// import environment from './environment'
 import FileManager from './file-manager'
 import UrlFileManager from './url-file-manager'
 import createFromEnvironment from '../less'
-const less = createFromEnvironment(environment, [
+const less = createFromEnvironment({}, [
   new FileManager(),
   new UrlFileManager()
 ])
-import lesscHelper from './lessc-helper'
 import PluginLoader from './plugin-loader'
-import fs from './fs.js'
+import fs from 'fs'
 import options from '../less/default-options'
-import imageSize from './image-size'
 
 // allow people to create less with their own environment
 less.createFromEnvironment = createFromEnvironment
-less.lesscHelper = lesscHelper
 less.PluginLoader = PluginLoader
 less.fs = fs
 less.FileManager = FileManager
@@ -23,7 +20,4 @@ less.UrlFileManager = UrlFileManager
 // Set up options
 less.options = options
 
-// provide image-size functionality
-imageSize(less.environment)
-
 export default less
diff --git a/src/less-node/lessc-helper.js b/src/less-node/lessc-helper.js
index 519268b..c27afba 100644
--- a/src/less-node/lessc-helper.js
+++ b/src/less-node/lessc-helper.js
@@ -1,179 +1,165 @@
 // lessc_helper.js
 //
 //      helper functions for lessc
-const lessc_helper = {
-  // Stylize a string
-  stylize: function (str, style) {
-    const styles = {
-      reset: [0, 0],
-      bold: [1, 22],
-      inverse: [7, 27],
-      underline: [4, 24],
-      yellow: [33, 39],
-      green: [32, 39],
-      red: [31, 39],
-      grey: [90, 39]
-    }
-    return `\x1b[${styles[style][0]}m${str}\x1b[${styles[style][1]}m`
-  },
 
-  // Print command line options
-  printUsage: function () {
-    console.log(
-      'usage: lessc [option option=parameter ...] <source> [destination]'
-    )
-    console.log('')
-    console.log(
-      "If source is set to `-' (dash or hyphen-minus), input is read from stdin."
-    )
-    console.log('')
-    console.log('options:')
-    console.log(
-      '  -h, --help                   Prints help (this message) and exit.'
-    )
-    console.log(
-      "  --include-path=PATHS         Sets include paths. Separated by `:'. `;' also supported on windows."
-    )
-    console.log(
-      '  -M, --depends                Outputs a makefile import dependency list to stdout.'
-    )
-    console.log('  --no-color                   Disables colorized output.')
-    console.log(
-      '  --ie-compat                  Enables IE8 compatibility checks.'
-    )
-    console.log(
-      '  --js                         Enables inline JavaScript in less files'
-    )
-    console.log('  -l, --lint                   Syntax check only (lint).')
-    console.log(
-      '  -s, --silent                 Suppresses output of error messages.'
-    )
-    console.log('  --strict-imports             Forces evaluation of imports.')
-    console.log(
-      '  --insecure                   Allows imports from insecure https hosts.'
-    )
-    console.log(
-      '  -v, --version                Prints version number and exit.'
-    )
-    console.log('  --verbose                    Be verbose.')
-    console.log(
-      '  --source-map[=FILENAME]      Outputs a v3 sourcemap to the filename (or output filename.map).'
-    )
-    console.log(
-      '  --source-map-rootpath=X      Adds this path onto the sourcemap filename and less file paths.'
-    )
-    console.log(
-      '  --source-map-basepath=X      Sets sourcemap base path, defaults to current working directory.'
-    )
-    console.log(
-      '  --source-map-include-source  Puts the less files into the map instead of referencing them.'
-    )
-    console.log(
-      '  --source-map-inline          Puts the map (and any less files) as a base64 data uri into the output css file.'
-    )
-    console.log(
-      '  --source-map-url=URL         Sets a custom URL to map file, for sourceMappingURL comment'
-    )
-    console.log('                               in generated CSS file.')
-    console.log(
-      '  --source-map-no-annotation   Excludes the sourceMappingURL comment from the output css file.'
-    )
-    console.log(
-      '  -rp, --rootpath=URL          Sets rootpath for url rewriting in relative imports and urls'
-    )
-    console.log(
-      '                               Works with or without the relative-urls option.'
-    )
-    console.log(
-      '  -ru=, --rewrite-urls=        Rewrites URLs to make them relative to the base less file.'
-    )
-    console.log(
-      "    all|local|off              'all' rewrites all URLs, 'local' just those starting with a '.'"
-    )
-    console.log('')
-    console.log('  -m=, --math=')
-    console.log(
-      '     always                    Less will eagerly perform math operations always.'
-    )
-    console.log(
-      '     parens-division           Math performed except for division (/) operator'
-    )
-    console.log(
-      '     parens | strict           Math only performed inside parentheses'
-    )
-    console.log(
-      '     strict-legacy             Parens required in very strict terms (legacy --strict-math)'
-    )
-    console.log('')
-    console.log(
-      '  -su=on|off                   Allows mixed units, e.g. 1px+1em or 1px*1px which have units'
-    )
-    console.log('  --strict-units=on|off        that cannot be represented.')
-    console.log(
-      "  --global-var='VAR=VALUE'     Defines a variable that can be referenced by the file."
-    )
-    console.log(
-      "  --modify-var='VAR=VALUE'     Modifies a variable already declared in the file."
-    )
-    console.log(
-      "  --url-args='QUERYSTRING'     Adds params into url tokens (e.g. 42, cb=42 or 'a=1&b=2')"
-    )
-    console.log(
-      '  --plugin=PLUGIN=OPTIONS      Loads a plugin. You can also omit the --plugin= if the plugin begins'
-    )
-    console.log(
-      '                               less-plugin. E.g. the clean css plugin is called less-plugin-clean-css'
-    )
-    console.log(
-      '                               once installed (npm install less-plugin-clean-css), use either with'
-    )
-    console.log(
-      '                               --plugin=less-plugin-clean-css or just --clean-css'
-    )
-    console.log(
-      '                               specify options afterwards e.g. --plugin=less-plugin-clean-css="advanced"'
-    )
-    console.log('                               or --clean-css="advanced"')
-    console.log('  --disable-plugin-rule        Disallow @plugin statements')
-    console.log('')
-    console.log('-------------------------- Deprecated ----------------')
-    console.log(
-      '  -sm=on|off               Legacy parens-only math. Use --math'
-    )
-    console.log('  --strict-math=on|off     ')
-    console.log('')
-    console.log('  --line-numbers=TYPE      Outputs filename and line numbers.')
-    console.log(
-      "                           TYPE can be either 'comments', which will output"
-    )
-    console.log(
-      "                           the debug info within comments, 'mediaquery'"
-    )
-    console.log(
-      '                           that will output the information within a fake'
-    )
-    console.log(
-      '                           media query which is compatible with the SASS'
-    )
-    console.log(
-      "                           format, and 'all' which will do both."
-    )
-    console.log(
-      '  -x, --compress           Compresses output by removing some whitespaces.'
-    )
-    console.log(
-      '                           We recommend you use a dedicated minifer like less-plugin-clean-css'
-    )
-    console.log('')
-    console.log('Report bugs to: http://github.com/less/less.js/issues')
-    console.log('Home page: <http://lesscss.org/>')
+export function stylize(str, style) {
+  const styles = {
+    reset: [0, 0],
+    bold: [1, 22],
+    inverse: [7, 27],
+    underline: [4, 24],
+    yellow: [33, 39],
+    green: [32, 39],
+    red: [31, 39],
+    grey: [90, 39]
   }
+  return `\x1b[${styles[style][0]}m${str}\x1b[${styles[style][1]}m`
 }
 
-// Exports helper functions
-// eslint-disable-next-line no-prototype-builtins
-for (const h in lessc_helper) {
-  if (lessc_helper.hasOwnProperty(h)) {
-    exports[h] = lessc_helper[h]
-  }
+// Print command line options
+export function printUsage() {
+  console.log(
+    'usage: lessc [option option=parameter ...] <source> [destination]'
+  )
+  console.log('')
+  console.log(
+    "If source is set to `-' (dash or hyphen-minus), input is read from stdin."
+  )
+  console.log('')
+  console.log('options:')
+  console.log(
+    '  -h, --help                   Prints help (this message) and exit.'
+  )
+  console.log(
+    "  --include-path=PATHS         Sets include paths. Separated by `:'. `;' also supported on windows."
+  )
+  console.log(
+    '  -M, --depends                Outputs a makefile import dependency list to stdout.'
+  )
+  console.log('  --no-color                   Disables colorized output.')
+  console.log(
+    '  --ie-compat                  Enables IE8 compatibility checks.'
+  )
+  console.log(
+    '  --js                         Enables inline JavaScript in less files'
+  )
+  console.log('  -l, --lint                   Syntax check only (lint).')
+  console.log(
+    '  -s, --silent                 Suppresses output of error messages.'
+  )
+  console.log('  --strict-imports             Forces evaluation of imports.')
+  console.log(
+    '  --insecure                   Allows imports from insecure https hosts.'
+  )
+  console.log('  -v, --version                Prints version number and exit.')
+  console.log('  --verbose                    Be verbose.')
+  console.log(
+    '  --source-map[=FILENAME]      Outputs a v3 sourcemap to the filename (or output filename.map).'
+  )
+  console.log(
+    '  --source-map-rootpath=X      Adds this path onto the sourcemap filename and less file paths.'
+  )
+  console.log(
+    '  --source-map-basepath=X      Sets sourcemap base path, defaults to current working directory.'
+  )
+  console.log(
+    '  --source-map-include-source  Puts the less files into the map instead of referencing them.'
+  )
+  console.log(
+    '  --source-map-inline          Puts the map (and any less files) as a base64 data uri into the output css file.'
+  )
+  console.log(
+    '  --source-map-url=URL         Sets a custom URL to map file, for sourceMappingURL comment'
+  )
+  console.log('                               in generated CSS file.')
+  console.log(
+    '  --source-map-no-annotation   Excludes the sourceMappingURL comment from the output css file.'
+  )
+  console.log(
+    '  -rp, --rootpath=URL          Sets rootpath for url rewriting in relative imports and urls'
+  )
+  console.log(
+    '                               Works with or without the relative-urls option.'
+  )
+  console.log(
+    '  -ru=, --rewrite-urls=        Rewrites URLs to make them relative to the base less file.'
+  )
+  console.log(
+    "    all|local|off              'all' rewrites all URLs, 'local' just those starting with a '.'"
+  )
+  console.log('')
+  console.log('  -m=, --math=')
+  console.log(
+    '     always                    Less will eagerly perform math operations always.'
+  )
+  console.log(
+    '     parens-division           Math performed except for division (/) operator'
+  )
+  console.log(
+    '     parens | strict           Math only performed inside parentheses'
+  )
+  console.log(
+    '     strict-legacy             Parens required in very strict terms (legacy --strict-math)'
+  )
+  console.log('')
+  console.log(
+    '  -su=on|off                   Allows mixed units, e.g. 1px+1em or 1px*1px which have units'
+  )
+  console.log('  --strict-units=on|off        that cannot be represented.')
+  console.log(
+    "  --global-var='VAR=VALUE'     Defines a variable that can be referenced by the file."
+  )
+  console.log(
+    "  --modify-var='VAR=VALUE'     Modifies a variable already declared in the file."
+  )
+  console.log(
+    "  --url-args='QUERYSTRING'     Adds params into url tokens (e.g. 42, cb=42 or 'a=1&b=2')"
+  )
+  console.log(
+    '  --plugin=PLUGIN=OPTIONS      Loads a plugin. You can also omit the --plugin= if the plugin begins'
+  )
+  console.log(
+    '                               less-plugin. E.g. the clean css plugin is called less-plugin-clean-css'
+  )
+  console.log(
+    '                               once installed (npm install less-plugin-clean-css), use either with'
+  )
+  console.log(
+    '                               --plugin=less-plugin-clean-css or just --clean-css'
+  )
+  console.log(
+    '                               specify options afterwards e.g. --plugin=less-plugin-clean-css="advanced"'
+  )
+  console.log('                               or --clean-css="advanced"')
+  console.log('  --disable-plugin-rule        Disallow @plugin statements')
+  console.log('')
+  console.log('-------------------------- Deprecated ----------------')
+  console.log('  -sm=on|off               Legacy parens-only math. Use --math')
+  console.log('  --strict-math=on|off     ')
+  console.log('')
+  console.log('  --line-numbers=TYPE      Outputs filename and line numbers.')
+  console.log(
+    "                           TYPE can be either 'comments', which will output"
+  )
+  console.log(
+    "                           the debug info within comments, 'mediaquery'"
+  )
+  console.log(
+    '                           that will output the information within a fake'
+  )
+  console.log(
+    '                           media query which is compatible with the SASS'
+  )
+  console.log(
+    "                           format, and 'all' which will do both."
+  )
+  console.log(
+    '  -x, --compress           Compresses output by removing some whitespaces.'
+  )
+  console.log(
+    '                           We recommend you use a dedicated minifer like less-plugin-clean-css'
+  )
+  console.log('')
+  console.log('Report bugs to: http://github.com/less/less.js/issues')
+  console.log('Home page: <http://lesscss.org/>')
 }
diff --git a/src/less-node/url-file-manager.js b/src/less-node/url-file-manager.js
index c51a50e..d628ab4 100644
--- a/src/less-node/url-file-manager.js
+++ b/src/less-node/url-file-manager.js
@@ -8,7 +8,6 @@ import url from 'url'
 let request
 import AbstractFileManager from '../less/environment/abstract-file-manager.js'
 import logger from '../less/logger'
-import needle from 'needle'
 
 const UrlFileManager = function () {}
 UrlFileManager.prototype = Object.assign(new AbstractFileManager(), {
@@ -18,13 +17,6 @@ UrlFileManager.prototype = Object.assign(new AbstractFileManager(), {
 
   loadFile(filename, currentDirectory, options, environment) {
     return new Promise((fulfill, reject) => {
-      if (request === undefined) {
-        try {
-          request = needle
-        } catch (e) {
-          request = null
-        }
-      }
       if (!request) {
         reject({
           type: 'File',
diff --git a/src/less/index.js b/src/less/index.js
index d838a18..72475c7 100644
--- a/src/less/index.js
+++ b/src/less/index.js
@@ -19,7 +19,6 @@ import ImportManager from './import-manager'
 import Parse from './parse'
 import Render from './render'
 import { version } from '../../package.json'
-import parseVersion from 'parse-node-version'
 
 export default function (environment, fileManagers) {
   let sourceMapOutput, sourceMapBuilder, parseTree, importManager
@@ -33,9 +32,9 @@ export default function (environment, fileManagers) {
   const render = Render(environment, parseTree, importManager)
   const parse = Parse(environment, parseTree, importManager)
 
-  const v = parseVersion(`v${version}`)
+  const v = version.split('.').map(n => +n)
   const initial = {
-    version: [v.major, v.minor, v.patch],
+    version: [v[0], v[1], v[2]],
     data,
     tree,
     Environment,
diff --git a/src/less/parser/parser.js b/src/less/parser/parser.js
index 4f191d1..ace89a5 100644
--- a/src/less/parser/parser.js
+++ b/src/less/parser/parser.js
@@ -145,7 +145,7 @@ const Parser = function Parser(context, imports, fileInfo, currentIndex) {
     // @param callback call `callback` when done.
     // @param [additionalData] An optional map which can contains vars - a map (key, value) of variables to apply
     //
-    parse: function (str, callback, additionalData) {
+    parse(str, callback, additionalData) {
       let root
       let err = null
       let globalVars
diff --git a/src/less/utils.js b/src/less/utils.js
index fb990f9..ae0a2ba 100644
--- a/src/less/utils.js
+++ b/src/less/utils.js
@@ -1,6 +1,27 @@
 /* jshint proto: true */
 import * as Constants from './constants'
-import { copy } from 'copy-anything'
+
+function copy(obj = {}) {
+  if (Array.isArray(obj)) {
+    return obj.map(it => copy(it))
+  } else if (typeof obj === 'object') {
+    let tmp = {}
+    for (let k in obj) {
+      if (obj[k] === void 0) {
+        continue
+      } else {
+        if (typeof obj[k] === 'object' && obj[k] !== null) {
+          tmp[k] = copy(obj[k])
+        } else {
+          tmp[k] = obj[k]
+        }
+      }
+    }
+    return tmp
+  } else {
+    return obj
+  }
+}
 
 export function getLocation(index, inputStream) {
   let n = index + 1
@@ -22,14 +43,7 @@ export function getLocation(index, inputStream) {
 }
 
 export function copyArray(arr) {
-  let i
-  const length = arr.length
-  const copy = new Array(length)
-
-  for (i = 0; i < length; i++) {
-    copy[i] = arr[i]
-  }
-  return copy
+  return [...arr]
 }
 
 export function clone(obj) {
@@ -46,10 +60,10 @@ export function defaults(obj1, obj2) {
   let newObj = obj2 || {}
   if (!obj2._defaults) {
     newObj = {}
-    const defaults = copy(obj1)
-    newObj._defaults = defaults
+    const _defaults = copy(obj1)
+    newObj._defaults = _defaults
     const cloned = obj2 ? copy(obj2) : {}
-    Object.assign(newObj, defaults, cloned)
+    Object.assign(newObj, _defaults, cloned)
   }
   return newObj
 }