Dev tools · alternatives · 2026
24 alternatives to ESInfer – Make JavaScript Type-Safe
Hello, folks. I'm Jiang, the author of ESInfer. I love writing Javascript because it has a prosperous ecosystem and is quick to get my hands dirty. However, sometimes it's painful when the flow is not fast to follow due to the lack of a type system. To solve this, I wrote ESInfer, a statical inference tool, to automatically type check and generate type annotations for Javascript. It works with pure Javascript without any add-ons to the language or user-space code and supports highly dynamic features, such as the modification of prototypes. It is still in the very early stage, which offers…
ESInfer is a static analysis tool that automatically type checks and generates type annotations for JavaScript code. It works with pure JavaScript without requiring language extensions or code modifications, and… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. ESInfer – Make JavaScript Type-Safe launched in 2022; newer entries below may have overtaken it.
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Open sourcing Ezno's checker and trying out / previewing the JavaScript type checker today
2023 · github.com · its alternatives →
- 2
I've built many interpreters over the years, and Bolt represents my attempt at building the scripting language I always wanted. This is the first public release, 0.1.0! I've felt like most embedded languages have been moving towards safety and typing over years, with things like Python type hints, the explosive popularity of typescript, and even typing in Luau, which powers one of the largest scripted evironments in the world. Bolt attempts to harness this directly in the lagnauge rather than as a preprocessing step, and reap benefits in terms of both safety and performance. I intend to be…
2025 · github.com · its alternatives →
- 3
Hi Hacker News! My name is Sagar, I’m working on a startup called Speakeasy - we’re making all APIs self-service. The platform is currently in beta, but we’re independently launching this tool which you can use to generate language-idiomatic, statically-typed TS SDKs from any public OpenAPI schemas. We hope to continue iterating on this to give devs a way to easily generate high fidelity client SDKs for all the major languages. Inspiration for this product is from past experiences struggling with OpenAPI. I was originally optimistic about using the OpenAPI tools to build out our offering,…
2022 · easysdk.xyz · its alternatives →
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2021 · typeitjs.com · its alternatives →
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Introducing Ezno and the current state of the project.
2022 · kaleidawave.github.io · its alternatives →
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We've been building Crust (https://crustjs.com/), a TypeScript-first, Bun-native CLI framework with zero dependencies. It's been powering our core product internally for a while, and we're now open-sourcing it. The problem we kept running into: existing CLI frameworks in the JS ecosystem are either minimal arg parsers where you wire everything yourself, or heavyweight frameworks with large dependency trees and Node-era assumptions. We wanted something in between. What Crust does differently: - Full type inference from definitions — args and flags are inferred automatically. No…
Mar 2026 · github.com · its alternatives →
- 9
This TypeScript package allows you to safely execute JavaScript code within a WebAssembly sandbox using the QuickJS engine. Perfect for isolating and running untrusted code securely, it leverages the lightweight and fast QuickJS engine compiled to WebAssembly, providing a robust environment for code execution. Features - *Security*: Run untrusted JavaScript code in a safe, isolated environment. - *File System*: Can mount a virtual file system - *Custom Node Modules*: Custom node modules are mountable - *Fetch Client*: Can provide a fetch client to make http(s) calls - *Test-Runner*: Includes…
2024 · github.com · its alternatives →
- 10CJ
2013 · heelhook.github.com · its alternatives →
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TypeScript 6.0▲156The Playground lets you write TypeScript or JavaScript online in a safe and sharable way.
Mar 2026 · typescriptlang.org · its alternatives →
- 12JP
2021 · grgv.xyz · its alternatives →
- 13EC
2015 · ruanyf.github.io · its alternatives →
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Hey there HN! I just wrapped up an all-day documentation spree for Instant API, a JavaScript framework for easily building web APIs that implements type safety at the HTTP interface. It uses a function-as-a-service approach combined with a slightly modified JSDoc spec to automatically enforce parameter and schema validation before HTTP requests make it through to your code. You just write comments above your endpoint functions and voila, enforced type safety contracts between your API endpoints and your developers. OpenAPI specifications are generated automatically as a byproduct of simply…
2023 · github.com · its alternatives →
- 16KA
The most powerful type-safe SQL query builder for TypeScript
2023 · kysely.dev · its alternatives →
- 17
🐠 Babel is a compiler for writing next generation JavaScript. - babel/babel
2014 · github.com · its alternatives →
- 18
A simple language server for JavaScript, powered by ESLint and Tern. - tbodt/js-langserver
2018 · github.com · its alternatives →
- 19AM
I made an open source, MIT license Typescript library based on some of the latest research that generates prompt injection attacks. It is a super minimal/lightweight and designed to be super easy to use. Keen to hear your thoughts and please be responsible and only pen test systems where you have permission to pen test!
2025 · prompt-injector.blueprintlab.io · its alternatives →
- 20AS
Took a stab at building my own string diffing JS package. I built an interactive demo for TypeIt’s website (https://typeitjs.com/build-your-own) a while back. The approach I took to handle user input necessitated a way to calculate the difference between the versions of a user’s text input. I searched around for a package to help me out and found a couple of good ones (like fast-diff), but I either didn’t really like their API or didn’t want to take on a huge new dependency. Instead, I thought I’d give it a shot myself (famous last words). I dove into it having no real formal…
2022 · its alternatives →
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un-opinionated S-expression syntax and macro system for JavaScript - anko/eslisp
2015 · github.com · its alternatives →
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:icecream: vanillatype - Lightweight runtime types for vanilla JS and Node - crisdosaygo/vanillatype
2020 · github.com · its alternatives →
- 23
Spent a week in the break building a pre-compiler that brings type safety to runtime. Still pretty early, but generally does what it says. Looking for feedback, code that breaks it (check out the playground), ideas etc.
Jan 2026 · typical.elliots.dev · its alternatives →
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Also compare
- Ezno, a TypeScript checker written in Rust, is now open source alternatives
- Bolt – A super-fast, statically-typed scripting language written in C alternatives
- An opinionated and statically-typed TypeScript SDK generator alternatives
- Flow alternatives
- TypeIt – A Versatile JavaScript Animated Typing Utility alternatives
- Ezno, a type checker for JavaScript and optimiser for React alternatives
Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →