diff --git a/package-lock.json b/package-lock.json
index 16ce095f9..f9465888c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3606,12 +3606,6 @@
       "integrity": "sha512-a+EPoD+uZiNfh+5fxw2nO9QwFa6nJe2Or35fGY6Ipw1R3R4AGz1d1TEZrCegvw2YTmZ0jXirGYlzxxpYSHwpEg==",
       "dev": true
     },
-    "css.escape": {
-      "version": "1.5.1",
-      "resolved": "https://registry.npmjs.org/css.escape/-/css.escape-1.5.1.tgz",
-      "integrity": "sha1-QuJ9T6BK4y+TGktNQZH6nN3ul8s=",
-      "dev": true
-    },
     "cssesc": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/cssesc/-/cssesc-2.0.0.tgz",
diff --git a/package.json b/package.json
index 55a765ece..365598520 100644
--- a/package.json
+++ b/package.json
@@ -76,7 +76,6 @@
     "conventional-changelog-cli": "^2.0.25",
     "copy-dir": "^1.2.0",
     "cross-env": "^6.0.3",
-    "css.escape": "^1.5.1",
     "cssnano": "^4.1.10",
     "cypress": "^3.8.1",
     "cypress-image-snapshot": "^3.1.1",
diff --git a/packages/docsify-server-renderer/index.js b/packages/docsify-server-renderer/index.js
index 8f70f78d7..0d87dffdd 100644
--- a/packages/docsify-server-renderer/index.js
+++ b/packages/docsify-server-renderer/index.js
@@ -1,13 +1,13 @@
 import { readFileSync } from 'fs';
 import { resolve, basename } from 'path';
 import resolvePathname from 'resolve-pathname';
-import debug from 'debug';
-import fetch from 'node-fetch';
 import { AbstractHistory } from '../../src/core/router/history/abstract';
 import { Compiler } from '../../src/core/render/compiler';
 import { isAbsolutePath } from '../../src/core/router/util';
 import * as tpl from '../../src/core/render/tpl';
 import { prerenderEmbed } from '../../src/core/render/embed';
+import fetch from 'node-fetch';
+import debug from 'debug';
 
 function cwd(...args) {
   return resolve(process.cwd(), ...args);
diff --git a/src/core/event/scroll.js b/src/core/event/scroll.js
index 7458ec0a6..ef78443ba 100644
--- a/src/core/event/scroll.js
+++ b/src/core/event/scroll.js
@@ -1,7 +1,7 @@
-import Tweezer from 'tweezer.js';
 import { isMobile } from '../util/env';
 import * as dom from '../util/dom';
 import config from '../config';
+import Tweezer from 'tweezer.js';
 
 const nav = {};
 let hoverOver = false;
diff --git a/src/core/global-api.js b/src/core/global-api.js
index fd5269ae1..5529bdaf3 100644
--- a/src/core/global-api.js
+++ b/src/core/global-api.js
@@ -1,10 +1,10 @@
-import marked from 'marked';
-import prism from 'prismjs';
 import * as util from './util';
 import * as dom from './util/dom';
 import { Compiler } from './render/compiler';
 import { slugify } from './render/slugify';
 import { get } from './fetch/ajax';
+import prism from 'prismjs';
+import marked from 'marked';
 
 export default function() {
   window.Docsify = {
diff --git a/src/core/render/compiler.js b/src/core/render/compiler.js
index 4916aae5e..c4c026205 100644
--- a/src/core/render/compiler.js
+++ b/src/core/render/compiler.js
@@ -1,40 +1,20 @@
-import marked from 'marked';
 import { isAbsolutePath, getPath, getParentPath } from '../router/util';
 import { isFn, merge, cached, isPrimitive } from '../util/core';
 import { tree as treeTpl } from './tpl';
 import { genTree } from './gen-tree';
 import { slugify } from './slugify';
 import { emojify } from './emojify';
+import { getAndRemoveConfig } from './utils';
 import { imageCompiler } from './compiler/image';
 import { highlightCodeCompiler } from './compiler/code';
 import { paragraphCompiler } from './compiler/paragraph';
 import { taskListCompiler } from './compiler/taskList';
 import { taskListItemCompiler } from './compiler/taskListItem';
 import { linkCompiler } from './compiler/link';
+import marked from 'marked';
 
 const cachedLinks = {};
 
-export function getAndRemoveConfig(str = '') {
-  const config = {};
-
-  if (str) {
-    str = str
-      .replace(/^'/, '')
-      .replace(/'$/, '')
-      .replace(/(?:^|\s):([\w-]+:?)=?([\w-]+)?/g, (m, key, value) => {
-        if (key.indexOf(':') === -1) {
-          config[key] = (value && value.replace(/"/g, '')) || true;
-          return '';
-        }
-
-        return m;
-      })
-      .trim();
-  }
-
-  return { str, config };
-}
-
 const compileMedia = {
   markdown(url) {
     return {
diff --git a/src/core/render/compiler/headline.js b/src/core/render/compiler/headline.js
index 10cb4ac84..3f5c22039 100644
--- a/src/core/render/compiler/headline.js
+++ b/src/core/render/compiler/headline.js
@@ -1,4 +1,4 @@
-import { getAndRemoveConfig } from '../compiler';
+import { getAndRemoveConfig } from '../utils';
 import { slugify } from './slugify';
 
 export const headingCompiler = ({ renderer, router, _self }) =>
diff --git a/src/core/render/compiler/link.js b/src/core/render/compiler/link.js
index 2c4b0cd79..faf2e4f7c 100644
--- a/src/core/render/compiler/link.js
+++ b/src/core/render/compiler/link.js
@@ -1,4 +1,4 @@
-import { getAndRemoveConfig } from '../compiler';
+import { getAndRemoveConfig } from '../utils';
 import { isAbsolutePath } from '../../router/util';
 
 export const linkCompiler = ({ renderer, router, linkTarget, compilerClass }) =>
diff --git a/src/core/render/embed.js b/src/core/render/embed.js
index b64d11a8b..083fb7f97 100644
--- a/src/core/render/embed.js
+++ b/src/core/render/embed.js
@@ -1,6 +1,6 @@
-import stripIndent from 'strip-indent';
 import { get } from '../fetch/ajax';
 import { merge } from '../util/core';
+import stripIndent from 'strip-indent';
 
 const cached = {};
 
diff --git a/src/core/render/index.js b/src/core/render/index.js
index 37cd6af34..9b50dc708 100644
--- a/src/core/render/index.js
+++ b/src/core/render/index.js
@@ -1,5 +1,4 @@
 /* eslint-disable no-unused-vars */
-import tinydate from 'tinydate';
 import * as dom from '../util/dom';
 import cssVars from '../util/polyfill/css-vars';
 import { callHook } from '../init/lifecycle';
@@ -11,6 +10,7 @@ import { scrollActiveSidebar } from '../event/scroll';
 import { Compiler } from './compiler';
 import * as tpl from './tpl';
 import { prerenderEmbed } from './embed';
+import tinydate from 'tinydate';
 
 function executeScript() {
   const script = dom
diff --git a/src/core/render/utils.js b/src/core/render/utils.js
new file mode 100644
index 000000000..2b7f0e052
--- /dev/null
+++ b/src/core/render/utils.js
@@ -0,0 +1,20 @@
+export function getAndRemoveConfig(str = '') {
+  const config = {};
+
+  if (str) {
+    str = str
+      .replace(/^'/, '')
+      .replace(/'$/, '')
+      .replace(/(?:^|\s):([\w-]+:?)=?([\w-]+)?/g, (m, key, value) => {
+        if (key.indexOf(':') === -1) {
+          config[key] = (value && value.replace(/"/g, '')) || true;
+          return '';
+        }
+
+        return m;
+      })
+      .trim();
+  }
+
+  return { str, config };
+}
diff --git a/src/core/router/index.js b/src/core/router/index.js
index 1cb2f67d8..923168898 100644
--- a/src/core/router/index.js
+++ b/src/core/router/index.js
@@ -1,8 +1,8 @@
 import { supportsPushState } from '../util/env';
 import * as dom from '../util/dom';
+import { noop } from '../util/core';
 import { HashHistory } from './history/hash';
 import { HTML5History } from './history/html5';
-import { noop } from '../util/core';
 
 export function routerMixin(proto) {
   proto.route = {};
diff --git a/test/unit/base.test.js b/test/unit/base.test.js
index ed050424a..736b70ac6 100644
--- a/test/unit/base.test.js
+++ b/test/unit/base.test.js
@@ -2,8 +2,8 @@
 require = require('esm')(
   module /* , options */
 ); /* eslint-disable-line no-global-assign */
-const { expect } = require('chai');
 const { History } = require('../../src/core/router/history/base');
+const { expect } = require('chai');
 
 class MockHistory extends History {
   parse(path) {
diff --git a/test/unit/render.test.js b/test/unit/render.test.js
index 60ed5e0a0..c65d4c958 100644
--- a/test/unit/render.test.js
+++ b/test/unit/render.test.js
@@ -1,5 +1,5 @@
-const { expect } = require('chai');
 const { init, expectSameDom } = require('../_helper');
+const { expect } = require('chai');
 
 describe('render', function() {
   it('important content (tips)', async function() {
diff --git a/test/unit/util.test.js b/test/unit/util.test.js
index 9dadf28a3..e4e8a0e3b 100644
--- a/test/unit/util.test.js
+++ b/test/unit/util.test.js
@@ -2,8 +2,8 @@
 require = require('esm')(
   module /* , options */
 ); /* eslint-disable-line no-global-assign */
-const { expect } = require('chai');
 const { resolvePath } = require('../../src/core/router/util');
+const { expect } = require('chai');
 
 describe('router/util', function() {
   it('resolvePath', async function() {