Over 20 years after its introduction to the programming community, JavaScript is now one of the most widespread cross-platform languages ever created. Starting as a small scripting language for adding trivial interactivity to webpages, JavaScript has grown to be a language of choice for both frontend and backend applications of every size. While the size, scope, and complexity of programs written in JavaScript has grown exponentially, the ability of the JavaScript language to express the relationships between different units of code has not. Combined with JavaScript’s rather peculiar runtime semantics, this mismatch between language and program complexity has made JavaScript development a difficult task to manage at scale.

The most common kinds of errors that programmers write can be described as type errors: a certain kind of value was used where a different kind of value was expected. This could be due to simple typos, a failure to understand the API surface of a library, incorrect assumptions about runtime behavior, or other errors. The goal of TypeScript is to be a static typechecker for JavaScript programs - in other words, a tool that runs before your code runs (static) and ensures that the types of the program are correct (typechecked).

If you are coming to TypeScript without a JavaScript background, with the intention of TypeScript being your first language, we recommend you first start reading the documentation on either the Microsoft Learn JavaScript tutorial or read JavaScript at the Mozilla Web Docs. If you have experience in other languages, you should be able to pick up JavaScript syntax quite quickly by reading the handbook.

• Microsoft Learn JavaScript tutorial
• JavaScript at the Mozilla Web Docs

TypeScript is JavaScript with syntax for types.

TypeScript is a strongly typed programming language that builds on JavaScript, giving you better tooling at any scale.

• Simple

  Designed to be small, yet full featured, Lunr enables you to provide a great search experience without the need for external, server-side, search services.

• Extensible

  Add powerful language processors to give more accurate results to user queries, or tweak the built-in processors to better fit your content.

• Everywhere

Lunr has no external dependencies and works in your browser or on the server with node.js

Semgrep is a fast, open-source, static analysis tool for finding bugs and enforcing code standards at editor, commit, and CI time. Get started →.

Semgrep analyzes code locally on your computer or in your build environment: code is never uploaded.

Its rules look like the code you already write; no abstract syntax trees, regex wrestling, or painful DSLs. Here's a quick rule for finding Python print() statements, run it online in Semgrep's Playground by clicking the image:

Semgrep rule example for finding Python print() statements

The Semgrep ecosystem includes:

Semgrep - the open-source command line tool at the heart of everything (this project)
Semgrep CI - a specialized Docker image for running Semgrep in CI environments
Semgrep Playground - an online interactive rule builder for writing and sharing rules
Semgrep Registry - 2,000+ community-driven rules covering security, correctness, and performance bugs
Semgrep App - deploy, manage, and monitor Semgrep at scale with free and paid tiers.

Join 100,000 other developers and security engineers already using Semgrep at companies like Chef, Dropbox, Figma, HashiCorp, Snowflake, and Trail of Bits. Also check out tools powered by Semgrep!

Semgrep is developed and commercially supported by r2c, a software security company.
Language support
General availability

C# · Go · Java · JavaScript · JSX · JSON · PHP · Python · Ruby · Scala · TypeScript · TSX

Marpit /mɑːrpɪt/ is the skinny framework for creating slide deck from Markdown. It can transform Markdown and CSS theme(s) to slide deck composed of static HTML and CSS and create a web page convertible into slide PDF by printing.

Marpit is designed to output minimum assets for the slide deck. You can use the bare assets as a logicless slide deck, but mainly we expect to integrate output with other tools and applications.

In fact, this framework is created for using as the base of a core converter in the next version of Marp.

Presentation Slides for Developers

Theo App is the authorized keys manager, you can use it as replacement for all of your authorized_keys It allows you to set fine permissions (specific user and host) or to use wildcard (ex, using host %.test.sample.com)

Ever wanted to create a cool QR code for your guests? But never wanted to type in your WiFi credentials into a form that submits them to a remote webserver to render the QR code? QiFi for the rescue! It will render the code in your browser, on your machine, so the WiFi stays as secure as it was before (read the code if you do not trust text on the internet :-))!

If you use the Save-button to store a code, this is still secure, as the data is stored in HTML5 localStorage and is never transmitted to the server (in contrast to cookie-based solutions).

CryptPad is the Zero Knowledge realtime collaborative editor.

Encryption carried out in your web browser protects the data from the server, the cloud and the NSA. It relies on the ChainPad realtime engine.

Leaflet is the leading open-source JavaScript library for mobile-friendly interactive maps. Weighing just about 38 KB of JS, it has all the mapping features most developers ever need.

• Otr.to - p2p chat, that mean you communicate directly, no logs saved on server
• Otr.to absolutely anonymous, registration free
• Otr.to browser based, that mean you don't need to install or ask somebody to install software
• Otr.to use OTR (Off-the-Record Messaging) - most secure cryptographic protocol
• Otr.to Open-source and written in JavaScript, that mean you can check how it works

This is a ridiculous presentation system that works great for creative, hurried people. See the demo for an example of it working.

It makes text and images as big as they can be, gives you minimal styling (em) and keyboard controls for navigation.

At GitHub, we're building the text editor we've always wanted. A tool you can customize to do anything, but also use productively on the first day without ever touching a config file. Atom is modern, approachable, and hackable to the core. We can't wait to see what you build with it.

Atom is a desktop application based on web technologies. Like other desktop apps, it has its own icon in the dock, native menus and dialogs, and full access to the file system.

Open the dev tools, however, and Atom's web-based core shines through. Whether you're tweaking the look of Atom's interface with CSS or adding major features with HTML and JavaScript, it's never been easier to take control of your editor.

Funktional programmieren lernen mit JavaScript

libuv is a multi-platform support library with a focus on asynchronous I/O. It was primarily developed for use by Node.js, but it’s also used by Luvit, Julia, pyuv, and others.