Merge pull request #12 from bakkot/lint

Lint

.eslintrc.js

@@ -0,0 +1,21 @@
+'use strict';
+module.exports = {
+  extends: ['eslint:recommended', 'eslint-config-prettier'],
+  parserOptions: {
+    ecmaVersion: 2020,
+  },
+  env: {
+    browser: true,
+  },
+  globals: {
+    browser: 'readonly',
+    chrome: 'readonly',
+  },
+  rules: {
+    strict: ['error', 'global'],
+    'no-unused-vars': ['error', { vars: 'local' }],
+    eqeqeq: ['error', 'always', { null: 'ignore' }],
+    curly: ['error', 'multi-line'],
+    'no-var': 'error',
+  },
+};

.github/workflows/lint_js.yml

@@ -0,0 +1,16 @@
+name: lint_js
+
+on: [pull_request, push]
+
+jobs:
+  check:
+    name: lint_js
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v3
+        with:
+          node-version: '16'
+      - run: npm ci
+      - run: npm run lint
+      - run: npm run format -- --check

.gitignore

@@ -3,3 +3,6 @@ extension/manifest.json
 
 # release builds
 release/*
+
+# JavaScript stuff
+node_modules

README.md

@@ -78,3 +78,6 @@ Join us on [Discord](https://www.tubearchivist.com/discord) and help us improve
 - [ ] Implement download button for videos on playlist
 - [ ] Error handling for connection errors
 - [X] Dynamically inject buttons with mutation observer
+
+## Making changes to the JavaScript
+The JavaScript does not require any build step; you just edit the files directly. However, there is config for eslint and prettier (a linter and formatter respectively); their use is recommended but not required. To use them, install `node`, run `npm i` from the root directory of this repository to install dependencies, then run `npm run lint` and `npm run format` to run eslint and prettier respectively.

extension/background.js

@@ -2,51 +2,48 @@
 extension background script listening for events
 */
 
-console.log("running background.js");
+'use strict';
+
+console.log('running background.js');
 
 let browserType = getBrowser();
 
-
 // boilerplate to dedect browser type api
 function getBrowser() {
-    if (typeof chrome !== "undefined") {
+  if (typeof chrome !== 'undefined') {
-        if (typeof browser !== "undefined") {
+    if (typeof browser !== 'undefined') {
       return browser;
     } else {
       return chrome;
     }
   } else {
-        console.log("failed to detect browser");
+    console.log('failed to detect browser');
-        throw "browser detection error"
+    throw 'browser detection error';
-    };
+  }
 }
-
 
 // send get request to API backend
 async function sendGet(path) {
-
   let access = await getAccess();
   const url = `${access.url}:${access.port}/${path}`;
-    console.log("GET: " + url);
+  console.log('GET: ' + url);
 
   const rawResponse = await fetch(url, {
-        method: "GET",
+    method: 'GET',
     headers: {
-            "Accept": "application/json",
+      Accept: 'application/json',
-            "Content-Type": "application/json",
+      'Content-Type': 'application/json',
-            "Authorization": "Token " + access.apiKey,
+      Authorization: 'Token ' + access.apiKey,
-            "mode": "no-cors"
+      mode: 'no-cors',
-        }
+    },
   });
 
   const content = await rawResponse.json();
   return content;
 }
 
-
 // send post/put request to API backend
 async function sendData(path, payload, method) {
-
   let access = await getAccess();
   const url = `${access.url}:${access.port}/${path}`;
   console.log(`${method}: ${url}`);
@@ -56,129 +53,113 @@ async function sendData(path, payload, method) {
     const rawResponse = await fetch(url, {
       method: method,
       headers: {
-                "Accept": "application/json",
+        Accept: 'application/json',
-                "Content-Type": "application/json",
+        'Content-Type': 'application/json',
-                "Authorization": "Token " + access.apiKey,
+        Authorization: 'Token ' + access.apiKey,
-                "mode": "no-cors"
+        mode: 'no-cors',
       },
-            body: JSON.stringify(payload)
+      body: JSON.stringify(payload),
     });
     const content = await rawResponse.json();
     return content;
   } catch (e) {
     console.error(e);
-        return null
+    return null;
   }
-
 }
 
-
 // read access details from storage.local
 async function getAccess() {
+  let storage = await browserType.storage.local.get('access');
 
-    var storage = await browserType.storage.local.get("access");
+  return storage.access;
-
-    return storage.access
-
 }
 
-
 // check if cookie is valid
 async function getCookieState() {
+  const path = 'api/cookie/';
+  let response = await sendGet(path);
+  console.log('cookie state: ' + JSON.stringify(response));
 
-    const path = "api/cookie/";
+  return response;
-    let response = await sendGet(path)
-    console.log("cookie state: " + JSON.stringify(response));
-    
-    return response
-
 }
 
-
 // send ping to server, return response
 async function verifyConnection() {
+  const path = 'api/ping/';
+  let response = await sendGet(path);
+  console.log('verify connection: ' + JSON.stringify(response));
 
-    const path = "api/ping/";
+  return response;
-    let response = await sendGet(path)
-    console.log("verify connection: " + JSON.stringify(response));
-
-    return response
 }
 
-
 // send youtube link from injected buttons
 async function youtubeLink(youtubeMessage) {
-    
   let path;
   let payload;
 
-    if (youtubeMessage.action === "download") {
+  if (youtubeMessage.action === 'download') {
-        path = "api/download/";
+    path = 'api/download/';
     payload = {
-            "data": [
+      data: [
         {
-                    "youtube_id": youtubeMessage.url,
+          youtube_id: youtubeMessage.url,
-                    "status": "pending",
+          status: 'pending',
-                }
+        },
-            ]
+      ],
-        }
+    };
-    } else if (youtubeMessage.action === "subscribe") {
+  } else if (youtubeMessage.action === 'subscribe') {
-        path = "api/channel/";
+    path = 'api/channel/';
     payload = {
-            "data": [
+      data: [
         {
-                    "channel_id": youtubeMessage.url,
+          channel_id: youtubeMessage.url,
-                    "channel_subscribed": true,
+          channel_subscribed: true,
-                }
+        },
-            ]
+      ],
-        }
+    };
   }
 
-    let response = await sendData(path, payload, "POST");
+  let response = await sendData(path, payload, 'POST');
-    return response
+  return response;
 }
 
-
 async function cookieStr(cookieLines) {
-
+  const path = 'api/cookie/';
-    const path = "api/cookie/";
   let payload = {
-        "cookie": cookieLines.join("\n")
+    cookie: cookieLines.join('\n'),
+  };
+  let response = await sendData(path, payload, 'PUT');
+
+  return response;
 }
-    let response = await sendData(path, payload, "PUT");
-
-    return response
-
-}
-
 
 function buildCookieLine(cookie) {
   return [
     cookie.domain,
-        "TRUE",
+    'TRUE',
     cookie.path,
     cookie.httpOnly.toString().toUpperCase(),
     Math.trunc(cookie.expirationDate) || 0,
     cookie.name,
     cookie.value,
-    ].join("\t");
+  ].join('\t');
 }
 
-
 async function sendCookies() {
-    console.log("function sendCookies");
+  console.log('function sendCookies');
 
   let cookieStores = await browserType.cookies.getAllCookieStores();
-    var cookieLines = [
+  let cookieLines = [
-        "# Netscape HTTP Cookie File",
+    '# Netscape HTTP Cookie File',
-        "# https://curl.haxx.se/rfc/cookie_spec.html",
+    '# https://curl.haxx.se/rfc/cookie_spec.html',
-        "# This is a generated file! Do not edit.\n"
+    '# This is a generated file! Do not edit.\n',
   ];
   for (let i = 0; i < cookieStores.length; i++) {
     const cookieStore = cookieStores[i];
-        var allCookiesStore = await browserType.cookies.getAll({
+    let allCookiesStore = await browserType.cookies.getAll({
-            domain: ".youtube.com",
+      domain: '.youtube.com',
-            storeId: cookieStore["id"]
+      storeId: cookieStore['id'],
     });
     for (let j = 0; j < allCookiesStore.length; j++) {
       const cookie = allCookiesStore[j];
@@ -188,37 +169,34 @@ async function sendCookies() {
 
   let response = cookieStr(cookieLines);
 
-    return response
+  return response;
-
 }
 
-
-
 // process and return message if needed
 function handleMessage(request, sender, sendResponse) {
-    console.log("message background.js listener: " + JSON.stringify(request));
+  console.log('message background.js listener: ' + JSON.stringify(request));
 
   if (request.verify === true) {
     let response = verifyConnection();
     response.then(message => {
       sendResponse(message);
-        })
+    });
   } else if (request.youtube) {
     let response = youtubeLink(request.youtube);
     response.then(message => {
-            sendResponse(message)
+      sendResponse(message);
-        })
+    });
   } else if (request.cookieState) {
     let response = getCookieState();
     response.then(message => {
-            sendResponse(message)
+      sendResponse(message);
-        })
+    });
   } else if (request.sendCookie) {
-        console.log("backgound: " + JSON.stringify(request));
+    console.log('backgound: ' + JSON.stringify(request));
     let response = sendCookies();
     response.then(message => {
-            sendResponse(message)
+      sendResponse(message);
-        })
+    });
   }
 
   return true;

extension/popup.js

@@ -2,93 +2,89 @@
 Loaded into popup index.html
 */
 
+'use strict';
+
 let browserType = getBrowser();
 
 // boilerplate to dedect browser type api
 function getBrowser() {
-    if (typeof chrome !== "undefined") {
+  if (typeof chrome !== 'undefined') {
-        if (typeof browser !== "undefined") {
+    if (typeof browser !== 'undefined') {
       return browser;
     } else {
       return chrome;
     }
   } else {
-        console.log("failed to dedect browser");
+    console.log('failed to dedect browser');
-        throw "browser detection error"
+    throw 'browser detection error';
-    };
+  }
 }
 
-
 // store access details
-document.getElementById("save-login").addEventListener("click", function () {
+document.getElementById('save-login').addEventListener('click', function () {
-    let url = document.getElementById("full-url").value;
+  let url = document.getElementById('full-url').value;
   if (!url.includes('://')) {
     url = 'http://' + url;
   }
   let parsed = new URL(url);
   let toStore = {
-        "access": {
+    access: {
-            "url": `${parsed.protocol}//${parsed.hostname}`,
+      url: `${parsed.protocol}//${parsed.hostname}`,
-            "port": parsed.port || (parsed.protocol === 'https:' ? '443' : '80'),
+      port: parsed.port || (parsed.protocol === 'https:' ? '443' : '80'),
-            "apiKey": document.getElementById("api-key").value
+      apiKey: document.getElementById('api-key').value,
-        }
+    },
   };
   browserType.storage.local.set(toStore, function () {
-        console.log("Stored connection details: " + JSON.stringify(toStore));
+    console.log('Stored connection details: ' + JSON.stringify(toStore));
     pingBackend();
   });
-})
+});
-
 
 // verify connection status
-document.getElementById("status-icon").addEventListener("click", function() {
+document.getElementById('status-icon').addEventListener('click', function () {
   pingBackend();
-})
+});
-
 
 // send cookie
-document.getElementById("sendCookies").addEventListener("click", function() {
+document.getElementById('sendCookies').addEventListener('click', function () {
   sendCookie();
-})
+});
-
 
 function sendCookie() {
-    console.log("popup send cookie");
+  console.log('popup send cookie');
 
   function handleResponse(message) {
-        console.log("handle cookie response: " + JSON.stringify(message));
+    console.log('handle cookie response: ' + JSON.stringify(message));
     let cookie_validated = message.cookie_validated;
-        document.getElementById("sendCookiesStatus").innerText = "validated: " + cookie_validated
+    document.getElementById('sendCookiesStatus').innerText = 'validated: ' + cookie_validated;
   }
 
   function handleError(error) {
     console.log(`Error: ${error}`);
   }
 
-    let checked = document.getElementById("sendCookies").checked;
+  let checked = document.getElementById('sendCookies').checked;
   let toStore = {
-        "sendCookies": {
+    sendCookies: {
-            "checked": checked
+      checked: checked,
-        }
+    },
   };
   browserType.storage.local.set(toStore, function () {
-        console.log("stored option: " + JSON.stringify(toStore));
+    console.log('stored option: ' + JSON.stringify(toStore));
-    })
+  });
   if (checked === false) {
-        return
+    return;
   }
-    let sending = browserType.runtime.sendMessage({"sendCookie": true});
+  let sending = browserType.runtime.sendMessage({ sendCookie: true });
   sending.then(handleResponse, handleError);
 }
 
-
 // send ping message to TA backend
 function pingBackend() {
-
   function handleResponse(message) {
-        if (message.response === "pong") {
+    if (message.response === 'pong') {
       setStatusIcon(true);
-            console.log("connection validated")
+      console.log('connection validated');
     }
   }
 
@@ -97,26 +93,23 @@ function pingBackend() {
     setStatusIcon(false);
   }
 
-    console.log("ping TA server")
+  console.log('ping TA server');
-    let sending = browserType.runtime.sendMessage({"verify": true});
+  let sending = browserType.runtime.sendMessage({ verify: true });
   sending.then(handleResponse, handleError);
-
 }
 
 // add url to image
 function addUrl(access) {
   const url = `${access.url}:${access.port}`;
-    document.getElementById("ta-url").setAttribute("href", url);
+  document.getElementById('ta-url').setAttribute('href', url);
 }
 
-
 function setCookieState() {
-
   function handleResponse(message) {
     console.log(message);
-        document.getElementById("sendCookies").checked = message.cookie_enabled;
+    document.getElementById('sendCookies').checked = message.cookie_enabled;
     if (message.validated_str) {
-            document.getElementById("sendCookiesStatus").innerText = message.validated_str;
+      document.getElementById('sendCookiesStatus').innerText = message.validated_str;
     }
   }
 
@@ -124,68 +117,57 @@ function setCookieState() {
     console.log(`Error: ${error}`);
   }
 
-    console.log("set cookie state");
+  console.log('set cookie state');
-    let sending = browserType.runtime.sendMessage({"cookieState": true});
+  let sending = browserType.runtime.sendMessage({ cookieState: true });
-    sending.then(handleResponse, handleError)
+  sending.then(handleResponse, handleError);
-    document.getElementById("sendCookies").checked = true;
+  document.getElementById('sendCookies').checked = true;
 }
 
-
 // change status icon based on connection status
 function setStatusIcon(connected) {
-
+  let statusIcon = document.getElementById('status-icon');
-    let statusIcon = document.getElementById("status-icon")
+  if (connected) {
-    if (connected == true) {
+    statusIcon.innerHTML = '☑';
-        statusIcon.innerHTML = "☑";
+    statusIcon.style.color = 'green';
-        statusIcon.style.color = "green";
   } else {
-        statusIcon.innerHTML = "☒";
+    statusIcon.innerHTML = '☒';
-        statusIcon.style.color = "red";
+    statusIcon.style.color = 'red';
   }
-
 }
 
-
 // fill in form
-document.addEventListener("DOMContentLoaded", async () => {
+document.addEventListener('DOMContentLoaded', async () => {
-
   function onGot(item) {
     if (!item.access) {
-            console.log("no access details found");
+      console.log('no access details found');
       setStatusIcon(false);
-            return
+      return;
     }
     let { url, port } = item.access;
     let fullUrl = url;
     if (!(url.startsWith('http://') && port === '80')) {
       fullUrl += `:${port}`;
     }
-        document.getElementById("full-url").value = fullUrl;
+    document.getElementById('full-url').value = fullUrl;
-        document.getElementById("api-key").value = item.access.apiKey;
+    document.getElementById('api-key').value = item.access.apiKey;
     pingBackend();
     addUrl(item.access);
-    };
+  }
 
   function setCookiesOptions(result) {
     if (!result.sendCookies || result.sendCookies.checked === false) {
-            console.log("sync cookies not set");
+      console.log('sync cookies not set');
-            return
+      return;
     }
-        console.log("set options: " + JSON.stringify(result));
+    console.log('set options: ' + JSON.stringify(result));
     setCookieState();
-
   }
 
-    function onError(error) {
+  browserType.storage.local.get('access', function (result) {
-        console.log(`Error: ${error}`);
+    onGot(result);
-    };
-
-    browserType.storage.local.get("access", function(result) {
-        onGot(result)
   });
 
-    browserType.storage.local.get("sendCookies", function(result) {
+  browserType.storage.local.get('sendCookies', function (result) {
-        setCookiesOptions(result)
+    setCookiesOptions(result);
-    })
+  });
-
+});
-})

extension/script.js

@@ -2,23 +2,24 @@
 content script running on youtube.com
 */
 
-let browserType = getBrowser();
+'use strict';
 
+let browserType = getBrowser();
 
 // boilerplate to dedect browser type api
 function getBrowser() {
-    if (typeof chrome !== "undefined") {
+  if (typeof chrome !== 'undefined') {
-        if (typeof browser !== "undefined") {
+    if (typeof browser !== 'undefined') {
-            console.log("detected firefox");
+      console.log('detected firefox');
       return browser;
     } else {
-            console.log("detected chrome");
+      console.log('detected chrome');
       return chrome;
     }
   } else {
-        console.log("failed to dedect browser");
+    console.log('failed to dedect browser');
-        throw "browser detection error"
+    throw 'browser detection error';
-    };
+  }
 }
 
 const downloadIcon = `<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
@@ -100,187 +101,181 @@ viewBox="0 0 500 500" style="enable-background:new 0 0 500 500;" xml:space="pres
    </g>
 </g>
 </g>
-</svg>`
+</svg>`;
-
 
 function buildButtonDiv() {
-    var buttonDiv = document.createElement("div");
+  let buttonDiv = document.createElement('div');
-    buttonDiv.setAttribute("id", "ta-channel-button");
+  buttonDiv.setAttribute('id', 'ta-channel-button');
 
   Object.assign(buttonDiv.style, {
-        display: "flex",
+    display: 'flex',
-        alignItems: "center",
+    alignItems: 'center',
-        backgroundColor: "#00202f",
+    backgroundColor: '#00202f',
-        color: "#fff",
+    color: '#fff',
-        fontSize: "14px",
+    fontSize: '14px',
-        padding: "5px",
+    padding: '5px',
-        margin: "0 5px",
+    margin: '0 5px',
-        borderRadius: "8px",
+    borderRadius: '8px',
   });
-    return buttonDiv
+  return buttonDiv;
 }
 
 function buildSubLink(channelContainer) {
-    var subLink = document.createElement("span");
+  let subLink = document.createElement('span');
-    subLink.innerText = "Subscribe";
+  subLink.innerText = 'Subscribe';
   subLink.addEventListener('click', e => {
     e.preventDefault();
-        var currentLocation = window.location.href;
+    let currentLocation = window.location.href;
-        console.log("subscribe to: " + currentLocation);
+    console.log('subscribe to: ' + currentLocation);
-        sendUrl(currentLocation, "subscribe", subLink);
+    sendUrl(currentLocation, 'subscribe', subLink);
   });
-    subLink.addEventListener("mouseover", e => {
+  subLink.addEventListener('mouseover', e => {
-        let subText
+    let subText;
-        if (window.location.pathname == "/watch") {
+    if (window.location.pathname === '/watch') {
-            var currentLocation = window.location.href;
+      let currentLocation = window.location.href;
       subText = currentLocation;
     } else {
-            subText = channelContainer.querySelector("#text").textContent;
+      subText = channelContainer.querySelector('#text').textContent;
-        };
+    }
 
-        e.target.title = "TA Subscribe: " + subText;
+    e.target.title = 'TA Subscribe: ' + subText;
   });
   Object.assign(subLink.style, {
-        padding: "5px",
+    padding: '5px',
-        cursor: "pointer",
+    cursor: 'pointer',
   });
 
-    return subLink
+  return subLink;
 }
 
 function buildSpacer() {
-    var spacer = document.createElement("span");
+  let spacer = document.createElement('span');
-    spacer.innerText = "|";
+  spacer.innerText = '|';
 
-    return spacer
+  return spacer;
 }
 
 function buildDlLink(channelContainer) {
-    var dlLink = document.createElement("span");
+  let dlLink = document.createElement('span');
   dlLink.innerHTML = downloadIcon;
 
   dlLink.addEventListener('click', e => {
     e.preventDefault();
-        var currentLocation = window.location.href;
+    let currentLocation = window.location.href;
-        console.log("download: " + currentLocation)
+    console.log('download: ' + currentLocation);
-        sendUrl(currentLocation, "download", dlLink);
+    sendUrl(currentLocation, 'download', dlLink);
   });
-    dlLink.addEventListener("mouseover", e => {
+  dlLink.addEventListener('mouseover', e => {
-        let subText
+    let subText;
-        if (window.location.pathname == "/watch") {
+    if (window.location.pathname === '/watch') {
-            var currentLocation = window.location.href;
+      let currentLocation = window.location.href;
       subText = currentLocation;
     } else {
-            subText = channelContainer.querySelector("#text").textContent;
+      subText = channelContainer.querySelector('#text').textContent;
-        };
-
-        e.target.title = "TA Download: " + subText;
-    });
-    Object.assign(dlLink.style, {
-        filter: "invert()",
-        width: "20px",
-        padding: "0 5px",
-        cursor: "pointer",
-    });
-
-    return dlLink
     }
 
+    e.target.title = 'TA Download: ' + subText;
+  });
+  Object.assign(dlLink.style, {
+    filter: 'invert()',
+    width: '20px',
+    padding: '0 5px',
+    cursor: 'pointer',
+  });
+
+  return dlLink;
+}
 
 function buildChannelButton(channelContainer) {
+  let buttonDiv = buildButtonDiv();
 
-    var buttonDiv = buildButtonDiv()
+  let subLink = buildSubLink(channelContainer);
+  buttonDiv.appendChild(subLink);
 
-    var subLink = buildSubLink(channelContainer);
+  let spacer = buildSpacer();
-    buttonDiv.appendChild(subLink)
-
-    var spacer = buildSpacer()
   buttonDiv.appendChild(spacer);
 
-    var dlLink = buildDlLink(channelContainer)
+  let dlLink = buildDlLink(channelContainer);
   buttonDiv.appendChild(dlLink);
 
-    return buttonDiv
+  return buttonDiv;
-
 }
 
 function getChannelContainers() {
-    var nodes = document.querySelectorAll("#inner-header-container, #owner");
+  let nodes = document.querySelectorAll('#inner-header-container, #owner');
-    return nodes
+  return nodes;
 }
 
 function getThubnailContainers() {
-    var nodes = document.querySelectorAll('#thumbnail');
+  let nodes = document.querySelectorAll('#thumbnail');
-    return nodes
+  return nodes;
 }
 
 function buildVideoButton(thumbContainer) {
-    var thumbLink = thumbContainer?.href;
+  let thumbLink = thumbContainer?.href;
   if (!thumbLink) return;
   if (thumbLink.includes('list=') || thumbLink.includes('/shorts/')) return;
 
-    var dlButton = document.createElement("a");
+  let dlButton = document.createElement('a');
-    dlButton.setAttribute("id", "ta-video-button");
+  dlButton.setAttribute('id', 'ta-video-button');
-    dlButton.href = '#'
+  dlButton.href = '#';
 
   dlButton.addEventListener('click', e => {
     e.preventDefault();
     let videoLink = thumbContainer.href;
-        console.log("download: " + videoLink);
+    console.log('download: ' + videoLink);
-        sendUrl(videoLink, "download", dlButton)
+    sendUrl(videoLink, 'download', dlButton);
   });
   dlButton.addEventListener('mouseover', e => {
     Object.assign(dlButton.style, {
       opacity: 1,
     });
     let videoTitle = thumbContainer.href;
-        e.target.title = "TA download: " + videoTitle;
+    e.target.title = 'TA download: ' + videoTitle;
-    })
+  });
-    dlButton.addEventListener('mouseout', e => {
+  dlButton.addEventListener('mouseout', () => {
     Object.assign(dlButton.style, {
       opacity: 0,
     });
-    })
-
-    Object.assign(dlButton.style, {
-        display: "flex",
-        position: "absolute",
-        top: "5px",
-        left: "5px",
-        alignItems: "center",
-        backgroundColor: "#00202f",
-        color: "#fff",
-        fontSize: "1.4rem",
-        textDecoration: "none",
-        borderRadius: "8px",
-        cursor: "pointer",
-        opacity: 0,
-        transition: "all 0.3s ease 0.3s",
   });
 
-    var dlIcon = document.createElement("span");
+  Object.assign(dlButton.style, {
+    display: 'flex',
+    position: 'absolute',
+    top: '5px',
+    left: '5px',
+    alignItems: 'center',
+    backgroundColor: '#00202f',
+    color: '#fff',
+    fontSize: '1.4rem',
+    textDecoration: 'none',
+    borderRadius: '8px',
+    cursor: 'pointer',
+    opacity: 0,
+    transition: 'all 0.3s ease 0.3s',
+  });
+
+  let dlIcon = document.createElement('span');
   dlIcon.innerHTML = downloadIcon;
   Object.assign(dlIcon.style, {
-        filter: "invert()",
+    filter: 'invert()',
-        width: "20px",
+    width: '20px',
-        padding: "10px 13px",
+    padding: '10px 13px',
   });
 
   dlButton.appendChild(dlIcon);
 
-    return dlButton
+  return dlButton;
-
 }
 
-
 // fix positioning of #owner div to fit new button
 function adjustOwner(channelContainer) {
   let sponsorButton = channelContainer.querySelector('#sponsor-button');
   if (sponsorButton === null) {
-        return channelContainer
+    return channelContainer;
   }
 
-    let variableMinWidth
+  let variableMinWidth;
   if (sponsorButton.hasChildNodes()) {
     variableMinWidth = '140px';
   } else {
@@ -288,65 +283,62 @@ function adjustOwner(channelContainer) {
   }
 
   Object.assign(channelContainer.firstElementChild.style, {
-        minWidth: variableMinWidth
+    minWidth: variableMinWidth,
-    })
+  });
   Object.assign(channelContainer.style, {
-        minWidth: 'calc(40% + 50px)'
+    minWidth: 'calc(40% + 50px)',
-    })
+  });
-    return channelContainer
+  return channelContainer;
 }
 
-
 function ensureTALinks() {
+  let channelContainerNodes = getChannelContainers();
 
-    var channelContainerNodes = getChannelContainers()
+  for (let channelContainer of channelContainerNodes) {
-
-    for (var channelContainer of channelContainerNodes) {
     channelContainer = adjustOwner(channelContainer);
     if (channelContainer.hasTA) continue;
-        var channelButton = buildChannelButton(channelContainer);
+    let channelButton = buildChannelButton(channelContainer);
     channelContainer.appendChild(channelButton);
     channelContainer.hasTA = true;
   }
 
-    var thumbContainerNodes = getThubnailContainers();
+  let thumbContainerNodes = getThubnailContainers();
 
-    for (var thumbContainer of thumbContainerNodes) {
+  for (let thumbContainer of thumbContainerNodes) {
     if (thumbContainer.hasTA) continue;
-        var videoButton = buildVideoButton(thumbContainer);
+    let videoButton = buildVideoButton(thumbContainer);
     if (videoButton == null) continue;
     thumbContainer.parentElement.appendChild(videoButton);
     thumbContainer.hasTA = true;
   }
-
 }
 
-
 function buttonError(button) {
-    let buttonSpan = button.querySelector("span");
+  let buttonSpan = button.querySelector('span');
-    if (buttonSpan === null) {
-        buttonSpan = button
-    }
-    buttonSpan.style.filter = "invert(19%) sepia(93%) saturate(7472%) hue-rotate(359deg) brightness(105%) contrast(113%)";
-    buttonSpan.style.color = "red";
-
-    button.style.opacity = 1;
-    button.addEventListener('mouseout', e => {
-        Object.assign(button.style, {
-            opacity: 1,
-        });
-    })
-}
-
-function buttonSuccess(button) {
-    let buttonSpan = button.querySelector("span");
   if (buttonSpan === null) {
     buttonSpan = button;
   }
-    if (buttonSpan.innerHTML === "Subscribe") {
+  buttonSpan.style.filter =
-        buttonSpan.innerHTML = "Success";
+    'invert(19%) sepia(93%) saturate(7472%) hue-rotate(359deg) brightness(105%) contrast(113%)';
+  buttonSpan.style.color = 'red';
+
+  button.style.opacity = 1;
+  button.addEventListener('mouseout', () => {
+    Object.assign(button.style, {
+      opacity: 1,
+    });
+  });
+}
+
+function buttonSuccess(button) {
+  let buttonSpan = button.querySelector('span');
+  if (buttonSpan === null) {
+    buttonSpan = button;
+  }
+  if (buttonSpan.innerHTML === 'Subscribe') {
+    buttonSpan.innerHTML = 'Success';
     setTimeout(() => {
-            buttonSpan.innerHTML = "Subscribe";
+      buttonSpan.innerHTML = 'Subscribe';
     }, 2000);
   } else {
     buttonSpan.innerHTML = checkmarkIcon;
@@ -356,12 +348,10 @@ function buttonSuccess(button) {
   }
 }
 
-
 function sendUrl(url, action, button) {
-
   function handleResponse(message) {
-        console.log("sendUrl response: " + JSON.stringify(message));
+    console.log('sendUrl response: ' + JSON.stringify(message));
-        if (message === null || message.detail === "Invalid token.") {
+    if (message === null || message.detail === 'Invalid token.') {
       buttonError(button);
     } else {
       buttonSuccess(button);
@@ -369,24 +359,22 @@ function sendUrl(url, action, button) {
   }
 
   function handleError(error) {
-        console.log("error");
+    console.log('error');
     console.log(JSON.stringify(error));
   }
 
   let payload = {
-        "youtube": {
+    youtube: {
-            "url": url,
+      url: url,
-            "action": action,
+      action: action,
-        }
+    },
-    }
+  };
 
-    console.log("youtube link: " + JSON.stringify(payload));
+  console.log('youtube link: ' + JSON.stringify(payload));
 
   let sending = browserType.runtime.sendMessage(payload);
   sending.then(handleResponse, handleError);
-
+}
-};
-
 
 let throttleBlock;
 const throttle = (callback, time) => {

package.json

@@ -0,0 +1,18 @@
+{
+  "name": "tubearchivist-browser-extension",
+  "private": true,
+  "scripts": {
+    "lint": "eslint 'extension/**/*.js'",
+    "format": "prettier --write 'extension/**/*.js'"
+  },
+  "devDependencies": {
+    "eslint": "^8.26.0",
+    "prettier": "^2.7.1",
+    "eslint-config-prettier": "^8.5.0"
+  },
+  "prettier": {
+    "singleQuote": true,
+    "arrowParens": "avoid",
+    "printWidth": 100
+  }
+}