TypeScript type-checking

Open-source TypeScript projects categorized as type-checking
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TypeScript JavaScript Validation Types type-check
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video.
Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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Top 5 TypeScript type-checking Projects

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  1. ts-toolbelt

    👷 TypeScript's largest type utility library

  2. SurveyJS

    SurveyJS: Build JSON-Driven Surveys and Forms with Full Data Control. Add the SurveyJS UI components to your JS app (React/Angular/Vue3). Securely collect and analyze data without sending it to 3rd-party servers. Fully customizable, works with any backend, and ideal for data-heavy apps. Learn more.

    SurveyJS logo

  3. ow

    Function argument validation for humans

  4. is-what

    JS type check (TypeScript supported) functions like `isPlainObject() isArray()` etc. A simple & small integration.

  5. vite-plugin-vitest-typescript-assert

    🔥 TypeScript type assertion plugin for vitest

  6. valitype

    A lightweight TypeScript validation library for environment variables and configuration.

    Project mention: Validate Your Env at Build Time — with Custom Rules Powered by Amazon Q Developer | dev.to | 2025-05-11

  7. Stream

    Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.

    Stream logo
NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).

TypeScript type-checking discussion

TypeScript type-checking related posts

  • Day 9 advent of typescript

    1 project | /r/typescript | 9 Dec 2023

  • Ow: Function Argument Validation for Humans

    1 project | news.ycombinator.com | 20 Jun 2022

  • Now we can force const contexts

    2 projects | /r/typescript | 2 Mar 2021

  • Has anyone made type safe localization library with TS 4.1 Template Literal Types?

    1 project | /r/typescript | 7 Feb 2021

Index

What are some of the best open-source type-checking projects in TypeScript? This list will help you:

# Project Stars
1 ts-toolbelt 7,101
2 ow 3,876
3 is-what 197
4 vite-plugin-vitest-typescript-assert 78
5 valitype 0

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SurveyJS: Build JSON-Driven Surveys and Forms with Full Data Control
Add the SurveyJS UI components to your JS app (React/Angular/Vue3). Securely collect and analyze data without sending it to 3rd-party servers. Fully customizable, works with any backend, and ideal for data-heavy apps. Learn more.
surveyjs.io
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