JavaScript

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New JavaScript Set methods (developer.mozilla.org)
submitted 5 months ago by [email protected] to c/javascript
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State of JavaScript 2023 (2023.stateofjs.com)
submitted 5 months ago by [email protected] to c/javascript
 
 

you might be wondering why these 2023 survey results are being released six months into 2024. The truth is, between launching the new State of HTML survey, innovating new question formats, collecting more freeform data than ever, and rewriting a lot of our data visualization codebase, we ended up with a workload that was probably a bit too ambitious, to say the least.

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submitted 5 months ago* (last edited 5 months ago) by xoron to c/javascript
 
 

chat.positive-intentions.com

github.com/positive-intentions/chat

I'm excited to share with you an instant messaging application I've been working on that might interest you. This is a chat app designed to work within your browser, with a focus on browser-based security and decentralization.

What makes this app unique is that it doesn't rely on messaging servers to function. Instead, it works based on your browser's javascript capabilities.

Here are some features of the app:

  • Encrypted messaging: Your messages are encrypted, making them more secure.
  • File sharing: Easily share files using WebRTC technology and QR codes.
  • Voice and video calls: Connect with others through voice and video calls.
  • Shared virtual space: Explore a shared mixed-reality space.
  • Image board: Browse and share images in a scrollable format.

Your security is a top priority. Here's how the app keeps you safe:

  • Decentralized authentication: No central server is required for login, making it harder for anyone to gain unauthorized access.
  • Unique IDs: Your ID is cryptographically random, adding an extra layer of security.
  • End-to-end encryption: Your messages are encrypted from your device to the recipient's device, ensuring only you and the recipient can read them.
  • Local data storage: Your data is stored only on your device, not on any external servers.
  • Self-hostable: You have the option to host the app on your own server if you prefer.

A decentralized infrastructure has many unique challenges and this is a unique approach. Ive taken previous feedback and made updates. Its important to note, the app is an unstable proof-of-concept and a work-in-progress. Its important to understand at this early stage in the project, there will be breaking changes. It is not ready to replace any existing apps or services. While the app is aiming to be an encrypted and secure chat system, the project is not mature enough to have been reviewed by security professionals and should not be considered encrypted or secure. it is provided for testing/review/feedback purposes.

Looking forward to hearing your thoughts!

The live app

About the app

Even more about the app

Docs

Subreddit

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I can do this manually using the following: Right-click on the video player, copy debug info, paste into text editor, and Ctrl+F for "addocid".

What is the best way to do this automatically?

By modifying an ad accelerator I found, I can reliably detect when a pre-roll ad is playing:

function handleVideoAd() {
	const video = document.querySelector('video');
	const adElement = document.querySelector('.video-ads.ytp-ad-module');
	if (video && adElement && adElement.children.length > 0) {
		alert('advertisement found!')
	}
}

function initializeAdHandling() {
	handleVideoAd();
	const observer = new MutationObserver(handleVideoAd);
	observer.observe(document.body, { childList: true, subtree: true });
}
initializeAdHandling()

If I had the video ID, I could then open the video in a new tab using something like:

window.open('https://www.youtube.com/watch?v=adVideoID');

However, I am at a bit of a loss as to how to extract the ad video ID itself.

In the browser inspector, the only places I can find the ad video ID are:

  1. Within the URL for ytp-cued-thumbnail-overlay-image
  2. As adVideoId within var ytInitialPlayerResponse, which itself is within <script nonce="rwc3vYf3vRLEyNQKsJOgig">, where rwc3vYf3vRLEyNQKsJOgig changes with every video.

What would be the best way to extract the advertisement video ID?

Apologies for if I'm going about this the wrong way. I am (very!) new to JavaScript, but interested in learning. Please let me know if I've broken any community rules, or committed any other sort of faux pas. Thanks! :)

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submitted 6 months ago by harendra21 to c/javascript
 
 

I have created this app for javascript beginners. Users can attempt daily quiz and see the explanation after each answer. Also providing the frequently used code snippets, you can download beautiful images of code snippets and quiz. Please provide your feedback.

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submitted 7 months ago* (last edited 7 months ago) by [email protected] to c/javascript
 
 

Fedify is an ActivityPub server framework in TypeScript & JavaScript. It aims to eliminate the complexity and redundant boilerplate code when building a federated server app, so that you can focus on your business logic and user experience.

The key features it provides currently are:

  • Type-safe objects for Activity Vocabulary (including some vendor-specific extensions)
  • WebFinger client and server
  • HTTP Signatures
  • Middleware for handling webhooks
  • NodeInfo protocol
  • Node.js, Deno, and Bun support

If you're curious, take a look at the Fedify website! There's comprehensive docs, a demo, a tutorial, example code, and more.

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Hi there,

I have written an article on implementing server-side caching that ensures your app stays fast as you scale.

I’ve used ExpressJS for the API server, and React for the frontend.

Hope this helps someone!

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I have a function as such:

export type SendMessageParams = {
  chatSession?: ChatSession,
  // ... other params ...
};

const sendMessage = async ({
  chatSession,
  // ... other params ...
}: SendMessageParams): Promise<void> => {
  // await chatSession?.sendMessage()
  // somewhere in implementation
};

export default sendMessage;

ChatSession is from @google/generative-ai.

I'd like to mock it in my test file as such:

let defaultParams: SendMessageParams;

beforeEach(() => {
  jest.mock('@google/generative-ai', () => ({
    ChatSession: {
      sendMessage: async (content: string) => content,
    },
  }));
  defaultParams = {
    chatSession: new ChatSession('', ''),
    // ... other params ...
  };
});

afterEach(() => {
  jest.clearAllMocks();
});

it('should send message', async () => {
  // await sendMessage();
});

When I run npm run test, I get the error saying:

 FAIL  tests/logic/actions/sendMessage.test.ts
  ● should send message

    ReferenceError: fetch is not defined

      43 |   const sendMessageInner = async (messages: Message[]) => {
      44 |     setMessageListState(messages);
    > 45 |     const result = await chatSession?.sendMessage(content);
         |                    ^
      46 |     const responseText = result?.response.text();
      47 |     if (responseText) {
      48 |       const responseMessage: Message = {

      at makeRequest (node_modules/@google/generative-ai/dist/index.js:246:9)
      at generateContent (node_modules/@google/generative-ai/dist/index.js:655:28)
      at node_modules/@google/generative-ai/dist/index.js:890:25
      at ChatSession.sendMessage (node_modules/@google/generative-ai/dist/index.js:909:9)
      at sendMessageInner (src/logic/actions/sendMessage.ts:45:20)
      at src/logic/actions/sendMessage.ts:72:7
      at sendMessage (src/logic/actions/sendMessage.ts:59:3)
      at Object.<anonymous> (tests/logic/actions/sendMessage.test.ts:44:3)

...which hints that chatSession.sendMessage method still uses the real implementation instead of mock.

I'd like to know why this happens and what the solution would be.

Thanks in advance.


Environment

  • Node 20.11.0 (lts/iron)
  • Jest 29.7.0
  • @google/generative-ai 0.5.0 (if relevant)
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Biome v1.7 (biomejs.dev)
submitted 7 months ago by arendjr to c/javascript
 
 

cross-posted from: https://programming.dev/post/12807878

This new version provides an easy path to migrate from ESLint and Prettier. It also introduces machine-readable reports for the formatter and the linter, new linter rules, and many fixes.

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Lets say I have a simple JS library. Most of the JS code is inside an object named after the library with the properties being the method functions. Some of these method functions require other method functions (Example, methodC() requires methodA()).

const myLibrary = {
   methodA: function() {...},
   methodB: functiom() {...},
   methodC: function() {...},
   methodD: function() {...}
}

How would I split these methods up into modules and split up this code into multiple files to make it a standard file structure for a NPM package. Currently all of the code is in one large JS file, and it could be broken down into modules. I would like to keep it all in the one object myLibrary like most NPM packages which when used, have the following syntax...

myLibrary.methodB(true, true);

Were all the methods are contained inside a object.

Any help will be most appreciated.

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Node Authentication With Passport.Js (javascript.withcodeexample.com)
submitted 7 months ago by harendra21 to c/javascript
42
 
 

Hi! I'm hoping someone can point me to best practices in regards to API cookies, NextJS, and SSR.

What I'm encountering is that I'm calling an external API that is trying to set some cookies on the browser. This works when the call is made directly from the browser to the API. However, if the API call is made from the SSR function, then the cookie data never makes it to the browser.

In this way the cookie is thrown away and never sent for follow-up requests.

What is the best way to handle these API cookies when using SSR? Is there a way to have NextJS pass them back to the browser or remember them for subsequent calls. Any advice, links, or videos would be very helpful.

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Many times when I’ve tried to write some code in Node.js using ES modules I’ve found myself reaching for __dirname and then looking up how to replace it. Now Node.js, Deno and Bun support import.meta.dirname. Check out the article for more detail.

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cross-posted from: https://lemm.ee/post/27328794

A twist of Tic Tac Toe inspired by VSauce written in React + JS.

I will happily accept contributions, if you're interested you can check for any open issues or create your own!

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Hello all,

My company is looking into building a new app from scratch based on Next.js with a few modules on the side (batch jobs, utility services, etc.)

Our current monorepo has been started over 4 years ago with Yarn Classic + Lerna and I was wondering what is the current consensus for building a monorepo, considering that the landscape has evolved greatly since then (npm now supports workspaces, pnpm has gained in popularity, Yarn has been re-engineered and multiple build systems have been released)

I would greatly appreciate if you have some comparison between package managers and build systems you could link to.

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Official docs say it's for

Packages that are only needed for local development and testing.

Umm, okay. Not 100% clear there. Some articles mention things like ESLint or Jest (k, I'm onboard there) but others mention Babel or WebPack. I get that you don't need WebPack libraries to be loaded in the browser but how the hell do you bundle up your code without it? When you use npm ci or npm install you'll get all dependencies but isn't it good practice (in a CICD environment) to use --omit=dev or --only=prod?

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