diff --git a/docs/assets/example/backlight.js b/docs/assets/example/backlight.js
deleted file mode 100644
index 0583aa641..000000000
--- a/docs/assets/example/backlight.js
+++ /dev/null
@@ -1,21 +0,0 @@
-var art = new Artplayer({
-    container: '.artplayer-app',
-    url: '/assets/sample/video.mp4',
-    autoSize: true,
-    light: true,
-    localVideo: true,
-    moreVideoAttr: {
-        crossOrigin: 'anonymous',
-    },
-    controls: [
-        {
-            name: 'open',
-            position: 'right',
-            html: 'Local Video',
-            mounted: $open => {
-                art.plugins.localVideo.attach($open);
-            },
-        },
-    ],
-    plugins: [artplayerPluginBacklight],
-});
diff --git a/docs/assets/example/github.js b/docs/assets/example/github.js
deleted file mode 100644
index 906262be0..000000000
--- a/docs/assets/example/github.js
+++ /dev/null
@@ -1,68 +0,0 @@
-// 使用 Github Issues Api 做弹幕接口
-// 接口每小时限制 5000 次请求，勿滥用
-var danmuku = new ArtplayerToolGithub({
-    api: 'zhw2590582/github-issues-api-as-danmuku/issues/1',
-    clientID: '749a95aad589f8849abe',
-    clientSecret: '7bb6fa67ef6e525e5bd5fda46cd3925ecc4a3760',
-});
-
-var art = new Artplayer({
-    container: '.artplayer-app',
-    url: '/assets/sample/video.mp4',
-    autoSize: true,
-    controls: [
-        {
-            name: 'danmuku',
-            position: 'right',
-            html: '发送弹幕',
-            click: () => {
-                if (window.location.href.includes('code=')) {
-                    art.notice.show = '正在登陆中，请稍等！！！';
-                } else if (!danmuku.isLogin) {
-                    danmuku.login();
-                } else {
-                    var text = prompt('请输入：', '弹幕内容');
-                    if (!text || !text.trim()) return;
-                    if (text.length >= 20) {
-                        art.notice.show = '弹幕字数不能大于20字！！！';
-                        return;
-                    }
-                    if (danmuku.remaining <= 10) {
-                        art.notice.show = '接口请求到达上限，请稍后再试！！！';
-                        return;
-                    }
-                    art.notice.show = '弹幕发送中...';
-                    danmuku
-                        .send({
-                            text: text,
-                            time: art.player.currentTime,
-                            color: '#' + Math.floor(Math.random() * 0xffffff).toString(16),
-                        })
-                        .then(data => {
-                            art.notice.show = `发送弹幕成功: ${danmuku.remaining} / ${danmuku.limit}`;
-                            art.plugins.artplayerPluginDanmuku.emit({
-                                ...data,
-                                mode: 0,
-                                time: art.player.currentTime + 0.2,
-                                border: true,
-                            });
-                        })
-                        .catch(() => {
-                            art.notice.show = `发送弹幕失败: ${danmuku.remaining} / ${danmuku.limit}`;
-                        });
-                }
-            },
-        },
-    ],
-    plugins: [
-        artplayerPluginDanmuku({
-            danmuku: () => danmuku.load(),
-            speed: 5,
-            opacity: 1,
-            color: '#fff',
-            size: 25,
-            maxlength: 50,
-            margin: [10, 100],
-        }),
-    ],
-});
diff --git a/docs/assets/js/ssr.js b/docs/assets/js/ssr.js
deleted file mode 100644
index 3b92c1071..000000000
--- a/docs/assets/js/ssr.js
+++ /dev/null
@@ -1,132 +0,0 @@
-const $container = document.querySelector('.artplayer-app');
-
-// 在服务器端可以直接访问 Artplayer.html 属性，返回供 ssr 使用的 html
-// 然后直接插值于播放器的容器里
-// const Artplayer = require('artplayer');
-// console.log(Artplayer.html);
-// 在浏览器端，开启 useSSR 即可
-
-// 模拟效果
-$container.innerHTML = Artplayer.html;
-
-var art = new Artplayer({
-    useSSR: true,
-    container: $container,
-    url: 'https://artplayer.org/assets/sample/video.mp4',
-    title: 'One More Time One More Chance',
-    poster: '/assets/sample/poster.jpg',
-    volume: 0.5,
-    isLive: false,
-    muted: false,
-    autoplay: false,
-    pip: true,
-    autoSize: true,
-    autoMini: true,
-    screenshot: true,
-    setting: true,
-    loop: true,
-    flip: true,
-    rotate: true,
-    playbackRate: true,
-    aspectRatio: true,
-    fullscreen: true,
-    fullscreenWeb: true,
-    subtitleOffset: true,
-    miniProgressBar: true,
-    localVideo: true,
-    localSubtitle: true,
-    networkMonitor: false,
-    mutex: true,
-    light: true,
-    backdrop: true,
-    log: true,
-    theme: '#ffad00',
-    lang: navigator.language.toLowerCase(),
-    moreVideoAttr: {
-        crossOrigin: 'anonymous',
-    },
-    contextmenu: [
-        {
-            html: 'Custom menu',
-            click: function (contextmenu) {
-                console.info('You clicked on the custom menu');
-                contextmenu.show = false;
-            },
-        },
-    ],
-    layers: [
-        {
-            html: `<img style="width: 100px" src="/assets/sample/layer.png">`,
-            click: function () {
-                console.info('You clicked on the custom layer');
-            },
-            style: {
-                position: 'absolute',
-                top: '20px',
-                right: '20px',
-                opacity: '.9',
-            },
-        },
-    ],
-    quality: [
-        {
-            default: true,
-            name: 'SD 480P',
-            url: '/assets/sample/video.mp4',
-        },
-        {
-            name: 'HD 720P',
-            url: '/assets/sample/video.mp4',
-        },
-    ],
-    thumbnails: {
-        url: '/assets/sample/thumbnails.png',
-        number: 100,
-        width: 160,
-        height: 90,
-        column: 10,
-    },
-    subtitle: {
-        url: '/assets/sample/subtitle.srt',
-        style: {
-            color: '#03A9F4',
-        },
-        encoding: 'utf-8',
-        bilingual: true,
-    },
-    highlight: [
-        {
-            time: 60,
-            text: 'One more chance',
-        },
-        {
-            time: 120,
-            text: '谁でもいいはずなのに',
-        },
-        {
-            time: 180,
-            text: '夏の想い出がまわる',
-        },
-        {
-            time: 240,
-            text: 'こんなとこにあるはずもないのに',
-        },
-        {
-            time: 300,
-            text: '终わり',
-        },
-    ],
-    controls: [
-        {
-            position: 'right',
-            html: 'Control',
-            click: function () {
-                console.info('You clicked on the custom control');
-            },
-        },
-    ],
-    icons: {
-        loading: '<img src="/assets/img/ploading.gif">',
-        state: '<img src="/assets/img/state.png">',
-    },
-});
diff --git a/docs/index.html b/docs/index.html
index edcc02af4..1f8a8b533 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -30,18 +30,12 @@
                                 <li>
                                     <a href="./?libs=.%2Funcompiled%2Fartplayer-plugin-danmuku.js&example=danmuku">artplayer-plugin-danmuku</a>
                                 </li>
-                                <li>
-                                    <a href="./?libs=.%2Funcompiled%2Fartplayer-plugin-backlight.js&example=backlight">artplayer-plugin-backlight</a>
-                                </li>
                             </ul>
                             <ul>
                                 <li class="title">Tools</li>
                                 <li>
                                     <a href="./?libs=.%2Funcompiled%2Fartplayer-tool-thumbnail.js&example=thumbnail">artplayer-tool-thumbnail</a>
                                 </li>
-                                <li>
-                                    <a href="./?libs=.%2Funcompiled%2Fartplayer-tool-github.js%0A.%2Funcompiled%2Fartplayer-plugin-danmuku.js&example=github">artplayer-tool-github</a>
-                                </li>
                             </ul>
                         </div>
                     </div>
diff --git a/docs/ssr.html b/docs/ssr.html
deleted file mode 100644
index 935e5a727..000000000
--- a/docs/ssr.html
+++ /dev/null
@@ -1,60 +0,0 @@
-<!DOCTYPE html>
-<html>
-
-<head>
-    <meta charset="UTF-8" />
-    <title>Artplayer.js</title>
-    <meta name="viewport"
-        content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no">
-    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
-    <meta name="keywords" content="artplayer, player, js, html5, video" />
-    <meta name="description" content="ArtPlayer.js is a modern and full featured HTML5 video player" />
-    <link rel="shortcut icon" href="./assets/img/favicon.ico" type="image/x-icon" />
-    <link rel="stylesheet" href="./assets/css/normalize.css">
-    <style>
-        html,
-        body {
-            height: 100%;
-        }
-
-        .container {
-            height: 100%;
-            display: flex;
-            justify-content: center;
-            align-items: center;
-        }
-
-        .artplayer-app {
-            width: 800px;
-            height: 600px;
-        }
-    </style>
-</head>
-
-<body>
-    <div class="container">
-        <div class="artplayer-app"></div>
-    </div>
-    <script src="./uncompiled/artplayer.js?t=6"></script>
-    <script src="./assets/js/ssr.js"></script>
-    <script>
-        var isLocalhost = Boolean(
-            window.location.hostname === 'localhost' ||
-            window.location.hostname === '[::1]' ||
-            window.location.hostname.match(
-                /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
-            )
-        );
-        var _hmt = _hmt || [];
-        (function () {
-            if (!isLocalhost) {
-                var hm = document.createElement('script');
-                hm.src = 'https://hm.baidu.com/hm.js?b6c9b8bafbf5fe7225160101dafbbc7d';
-                var s = document.getElementsByTagName('script')[0];
-                s.parentNode.insertBefore(hm, s);
-            }
-        })();
-    </script>
-</body>
-
-</html>
\ No newline at end of file
diff --git a/packages/artplayer-plugin-backlight/.npmignore b/packages/artplayer-plugin-backlight/.npmignore
deleted file mode 100644
index 429145126..000000000
--- a/packages/artplayer-plugin-backlight/.npmignore
+++ /dev/null
@@ -1,9 +0,0 @@
-node_modules
-.DS_Store
-yarn.lock
-package-lock.json
-test
-coverage
-.nyc_output
-.cache
-docs
\ No newline at end of file
diff --git a/packages/artplayer-plugin-backlight/.npmrc b/packages/artplayer-plugin-backlight/.npmrc
deleted file mode 100644
index 9cf949503..000000000
--- a/packages/artplayer-plugin-backlight/.npmrc
+++ /dev/null
@@ -1 +0,0 @@
-package-lock=false
\ No newline at end of file
diff --git a/packages/artplayer-plugin-backlight/README.md b/packages/artplayer-plugin-backlight/README.md
deleted file mode 100644
index 66bdee3c3..000000000
--- a/packages/artplayer-plugin-backlight/README.md
+++ /dev/null
@@ -1,47 +0,0 @@
-# artplayer-plugin-backlight
-
-Backlight plugin for ArtPlayer
-
-## Demo
-
-[Checkout the demo](https://artplayer.org/?libs=.%2Funcompiled%2Fartplayer-plugin-backlight.js&example=backlight) from Github Pages
-
-## Install
-
-Install with `npm`
-
-```bash
-$ npm install artplayer-plugin-backlight
-```
-
-Or install with `yarn`
-
-```bash
-$ yarn add artplayer-plugin-backlight
-```
-
-```js
-import artplayerPluginBacklight from 'artplayer-plugin-backlight';
-```
-
-Or umd builds are also available
-
-```html
-<script src="artplayer-plugin-backlight.js"></script>
-```
-
-Will expose the global variable to `window.artplayerPluginBacklight`.
-
-## Usage
-
-```js
-var art = new Artplayer({
-    container: '.artplayer-app',
-    url: 'path/to/video.mp4',
-    plugins: [artplayerPluginBacklight],
-});
-```
-
-## License
-
-MIT © [Harvey Zack](https://sleepy.im/)
diff --git a/packages/artplayer-plugin-backlight/dist/artplayer-plugin-backlight.js b/packages/artplayer-plugin-backlight/dist/artplayer-plugin-backlight.js
deleted file mode 100644
index 1a026168f..000000000
--- a/packages/artplayer-plugin-backlight/dist/artplayer-plugin-backlight.js
+++ /dev/null
@@ -1,8 +0,0 @@
-/*!
- * artplayer-plugin-backlight.js v4.0.0
- * Github: https://github.com/zhw2590582/ArtPlayer#readme
- * (c) 2017-2021 Harvey Zack
- * Released under the MIT License.
- */
-
-!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).artplayerPluginBacklight=e()}(this,(function(){"use strict";function t(t){for(var e=[],o=0;o<10;o+=1)for(var n=0;n<5;n+=1)0!==o&&9!==o&&0!==n&&4!==n||e.push(t(o,n,10,5));return e}return function(e){var o=e.constructor.utils.setStyles,n=e.template,a=n.$player,i=n.$video,r=e.player,c=document.createElement("div");c.classList.add("artplayer-backlight"),o(c,{position:"absolute",zIndex:9,left:0,top:0,right:0,bottom:0,width:"100%",height:"100%"});var l,s=(l=c,t((function(t,e,o,n){var a=document.createElement("div");return a.style.position="absolute",a.style.left="".concat(100*t/o,"%"),a.style.top="".concat(100*e/n,"%"),a.style.width="".concat(100/o,"%"),a.style.height="".concat(100/n,"%"),a.style.webkitBorderRadius="50%",a.style.borderRadius="50%",a.style.webkitTransition="all .2s ease",a.style.transition="all .2s ease",l.appendChild(a),{$box:a,left:0===t,right:t===o-1,top:0===e,bottom:e===n-1}}))),u=document.createElement("canvas");return a.insertBefore(c,i),function o(){setTimeout((function(){if(r.playing){var n=i.clientWidth,a=i.clientHeight,c=function(e,o,n,a){var i=e.getContext("2d");return e.width=n,e.height=a,i.drawImage(o,0,0),t((function(t,e,o,r){for(var c=n/o,l=a/r,s=t*c,u=e*l,d=i.getImageData(s,u,c,l).data,f=0,h=0,p=0,g=0,y=d.length;g<y;g+=4)f+=d[g],h+=d[g+1],p+=d[g+2];return{r:f=Math.floor(f/(d.length/4)),g:h=Math.floor(h/(d.length/4)),b:p=Math.floor(p/(d.length/4))}}))}(u,i,n,a);c.forEach((function(t,e){var o=t.r,n=t.g,a=t.b,i=s[e],r=i.$box,c=i.left,l=i.right,u=i.top,d=i.bottom,f=c?"-64px":l?"64px":"0",h=u?"-64px":d?"64px":"0";r.style.webkitBoxShadow="rgb(".concat(o,", ").concat(n,", ").concat(a,") ").concat(f," ").concat(h," 128px"),r.style.boxShadow="rgb(".concat(o,", ").concat(n,", ").concat(a,") ").concat(f," ").concat(h," 128px")}))}e.isDestroy||o()}),200)}(),{name:"artplayerPluginBacklight"}}}));
diff --git a/packages/artplayer-plugin-backlight/package.json b/packages/artplayer-plugin-backlight/package.json
deleted file mode 100644
index 53fe1bbd7..000000000
--- a/packages/artplayer-plugin-backlight/package.json
+++ /dev/null
@@ -1,25 +0,0 @@
-{
-  "name": "artplayer-plugin-backlight",
-  "version": "4.0.0",
-  "expose": "artplayerPluginBacklight",
-  "description": "Backlight plugin for ArtPlayer",
-  "main": "dist/artplayer-plugin-backlight.js",
-  "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/zhw2590582/ArtPlayer.git"
-  },
-  "keywords": [
-    "video",
-    "player"
-  ],
-  "author": "Harvey Zack <laozhaochaguan@gmail.com>",
-  "license": "MIT",
-  "bugs": {
-    "url": "https://github.com/zhw2590582/ArtPlayer/issues"
-  },
-  "homepage": "https://github.com/zhw2590582/ArtPlayer#readme",
-  "gitHead": "5ea211ef738351668e4acace326af4ff6947e2ee"
-}
diff --git a/packages/artplayer-plugin-backlight/src/index.js b/packages/artplayer-plugin-backlight/src/index.js
deleted file mode 100644
index ee5403068..000000000
--- a/packages/artplayer-plugin-backlight/src/index.js
+++ /dev/null
@@ -1,115 +0,0 @@
-function matrixCallback(callback) {
-    const result = [];
-    const x = 10;
-    const y = 5;
-    for (let xIndex = 0; xIndex < x; xIndex += 1) {
-        for (let yIndex = 0; yIndex < y; yIndex += 1) {
-            if (xIndex === 0 || xIndex === x - 1 || yIndex === 0 || yIndex === y - 1) {
-                result.push(callback(xIndex, yIndex, x, y));
-            }
-        }
-    }
-    return result;
-}
-
-function getColors($canvas, $video, width, height) {
-    const ctx = $canvas.getContext('2d');
-    $canvas.width = width;
-    $canvas.height = height;
-    ctx.drawImage($video, 0, 0);
-    return matrixCallback((xIndex, yIndex, x, y) => {
-        const itemW = width / x;
-        const itemH = height / y;
-        const itemX = xIndex * itemW;
-        const itemY = yIndex * itemH;
-        const { data } = ctx.getImageData(itemX, itemY, itemW, itemH);
-        let r = 0;
-        let g = 0;
-        let b = 0;
-        for (let i = 0, l = data.length; i < l; i += 4) {
-            r += data[i];
-            g += data[i + 1];
-            b += data[i + 2];
-        }
-        r = Math.floor(r / (data.length / 4));
-        g = Math.floor(g / (data.length / 4));
-        b = Math.floor(b / (data.length / 4));
-        return { r, g, b };
-    });
-}
-
-function creatMatrix(parent) {
-    return matrixCallback((xIndex, yIndex, x, y) => {
-        const $box = document.createElement('div');
-        $box.style.position = 'absolute';
-        $box.style.left = `${(xIndex * 100) / x}%`;
-        $box.style.top = `${(yIndex * 100) / y}%`;
-        $box.style.width = `${100 / x}%`;
-        $box.style.height = `${100 / y}%`;
-        $box.style.webkitBorderRadius = '50%';
-        $box.style.borderRadius = '50%';
-        $box.style.webkitTransition = 'all .2s ease';
-        $box.style.transition = 'all .2s ease';
-        parent.appendChild($box);
-        return {
-            $box,
-            left: xIndex === 0,
-            right: xIndex === x - 1,
-            top: yIndex === 0,
-            bottom: yIndex === y - 1,
-        };
-    });
-}
-
-function artplayerPluginBacklight(art) {
-    const { setStyles } = art.constructor.utils;
-    const {
-        template: { $player, $video },
-        player,
-    } = art;
-
-    const $backlight = document.createElement('div');
-    $backlight.classList.add('artplayer-backlight');
-    setStyles($backlight, {
-        position: 'absolute',
-        zIndex: 9,
-        left: 0,
-        top: 0,
-        right: 0,
-        bottom: 0,
-        width: '100%',
-        height: '100%',
-    });
-
-    const matrix = creatMatrix($backlight);
-    const $canvas = document.createElement('canvas');
-    $player.insertBefore($backlight, $video);
-
-    (function loop() {
-        setTimeout(() => {
-            if (player.playing) {
-                const { clientWidth, clientHeight } = $video;
-                const colors = getColors($canvas, $video, clientWidth, clientHeight);
-                colors.forEach(({ r, g, b }, index) => {
-                    const { $box, left, right, top, bottom } = matrix[index];
-                    // eslint-disable-next-line no-nested-ternary
-                    const x = left ? '-64px' : right ? '64px' : '0';
-                    // eslint-disable-next-line no-nested-ternary
-                    const y = top ? '-64px' : bottom ? '64px' : '0';
-                    $box.style.webkitBoxShadow = `rgb(${r}, ${g}, ${b}) ${x} ${y} 128px`;
-                    $box.style.boxShadow = `rgb(${r}, ${g}, ${b}) ${x} ${y} 128px`;
-                });
-            }
-
-            if (!art.isDestroy) {
-                loop();
-            }
-        }, 200);
-    })();
-
-    return {
-        name: 'artplayerPluginBacklight',
-    };
-}
-
-export default artplayerPluginBacklight;
diff --git a/packages/artplayer-tool-github/.npmignore b/packages/artplayer-tool-github/.npmignore
deleted file mode 100644
index 429145126..000000000
--- a/packages/artplayer-tool-github/.npmignore
+++ /dev/null
@@ -1,9 +0,0 @@
-node_modules
-.DS_Store
-yarn.lock
-package-lock.json
-test
-coverage
-.nyc_output
-.cache
-docs
\ No newline at end of file
diff --git a/packages/artplayer-tool-github/.npmrc b/packages/artplayer-tool-github/.npmrc
deleted file mode 100644
index 9cf949503..000000000
--- a/packages/artplayer-tool-github/.npmrc
+++ /dev/null
@@ -1 +0,0 @@
-package-lock=false
\ No newline at end of file
diff --git a/packages/artplayer-tool-github/README.md b/packages/artplayer-tool-github/README.md
deleted file mode 100644
index 93720cde6..000000000
--- a/packages/artplayer-tool-github/README.md
+++ /dev/null
@@ -1,37 +0,0 @@
-# artplayer-plugin-github
-
-Danmu plugin for ArtPlayer
-
-## Demo
-
-[Checkout the demo](https://artplayer.org/?libs=./uncompiled/artplayer-tool-github.js%0A./uncompiled/artplayer-plugin-danmuku.js&example=github) from Github Pages
-
-## Install
-
-Install with `npm`
-
-```bash
-$ npm install artplayer-plugin-github
-```
-
-Or install with `yarn`
-
-```bash
-$ yarn add artplayer-plugin-github
-```
-
-```js
-import ArtplayerToolGithub from 'artplayer-plugin-github';
-```
-
-Or umd builds are also available
-
-```html
-<script src="artplayer-plugin-github.js"></script>
-```
-
-Will expose the global variable to `window.ArtplayerToolGithub`.
-
-## License
-
-MIT © [Harvey Zack](https://sleepy.im/)
diff --git a/packages/artplayer-tool-github/dist/artplayer-tool-github.js b/packages/artplayer-tool-github/dist/artplayer-tool-github.js
deleted file mode 100644
index ea6ea12e3..000000000
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-/*!
- * artplayer-tool-github.js v4.0.0
- * Github: https://github.com/zhw2590582/ArtPlayer#readme
- * (c) 2017-2021 Harvey Zack
- * Released under the MIT License.
- */
-
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diff --git a/packages/artplayer-tool-github/package.json b/packages/artplayer-tool-github/package.json
deleted file mode 100644
index ae740c14f..000000000
--- a/packages/artplayer-tool-github/package.json
+++ /dev/null
@@ -1,28 +0,0 @@
-{
-  "name": "artplayer-tool-github",
-  "version": "4.0.0",
-  "expose": "ArtplayerToolGithub",
-  "description": "Github tool for ArtPlayer",
-  "main": "dist/artplayer-tool-github.js",
-  "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/zhw2590582/ArtPlayer.git"
-  },
-  "keywords": [
-    "video",
-    "player"
-  ],
-  "author": "Harvey Zack <laozhaochaguan@gmail.com>",
-  "license": "MIT",
-  "bugs": {
-    "url": "https://github.com/zhw2590582/ArtPlayer/issues"
-  },
-  "homepage": "https://github.com/zhw2590582/ArtPlayer#readme",
-  "dependencies": {
-    "issues-danmuku": "latest"
-  },
-  "gitHead": "5ea211ef738351668e4acace326af4ff6947e2ee"
-}
diff --git a/packages/artplayer-tool-github/src/index.js b/packages/artplayer-tool-github/src/index.js
deleted file mode 100644
index eaad309c8..000000000
--- a/packages/artplayer-tool-github/src/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-import ArtplayerToolGithub from 'issues-danmuku';
-
-export default ArtplayerToolGithub;
\ No newline at end of file