News

TypeScript Tops GitHub Octoverse as AI Era Reshapes Language Choices

• By David Ramel
• 10/31/2025

TypeScript became the most used language on GitHub by monthly contributors in August 2025, surpassing Python and JavaScript.

According to GitHub's Octoverse 2025 report published Oct. 28, TypeScript reached 2,636,006 monthly contributors, up by about 1.05 million year over year (66.63%), a shift the report ties to typed languages working well with agent-assisted coding and to major frameworks scaffolding projects in TypeScript by default. This marks the most significant language shift in more than a decade.

The sprawling GitHub Octoverse report is an annual analysis published by GitHub that highlights key trends, statistics, and insights from activity across its platform.

Here's how GitHub presented the TypeScript ascension:

• By the numbers. TypeScript finished #1 on GitHub in August 2025 with 2,636,006 monthly contributors (+1.05M YoY; +66.6%) and led new repositories. 
• Typed contracts scale AI-assisted teams. Type systems reduce ambiguity and catch LLM errors before production.
• Frameworks ship with TypeScript by default. Next.js 15, Astro 3, SvelteKit 2, Qwik, SolidStart, Angular 18, and Remix all generate a TypeScript codebase by default (npm create, pnpm dlx, or bunx create). 
• Typed systems help identify LLM-generated compile errors earlier in the pipeline. A 2025 academic study found 94% of LLM-generated compilation errors were type-check failures. 
• Low barrier to entry. Tooling like Vite, ts-node, Bun, and IDE autoconfig hide boilerplate, so junior devs can spin up typed stacks quickly.

The Octoverse data frames TypeScript's rise within broader adoption of AI and agentic tools. GitHub says nearly 80% of new developers used Copilot within their first week, and more than 1.1 million public repositories now import an LLM SDK, up 178% year over year as of August 2025. Typed systems help identify LLM-generated compile errors earlier in the pipeline and the report lists recent framework defaults that generate TypeScript codebases out of the box. It also highlights a 2025 academic finding that most LLM-generated compilation errors were type-check failures, underscoring the value of stricter type systems.

Python remains dominant in AI and data science, while JavaScript usage is still massive, though growth has shifted toward TypeScript. The report's contributor-based snapshot shows TypeScript at No. 1, Python at No. 2, and continued strength for enterprise languages including C# and Java. Nearly 80% of new repositories over the last year used one of six languages, including TypeScript and C#, reinforcing that these stacks anchor most modern development work. The data further shows heightened overall activity on GitHub--issues closed, pull requests merged, and code pushes all hit records--as AI features like Copilot code review and the Copilot coding agent moved from preview to broader usage.

For Microsoft-centric developers, the throughline is clear: TypeScript's momentum pairs naturally with VS Code and Visual Studio workflows, while AI-assisted development is quickly becoming a default expectation. The report also surfaces multiple Microsoft-ecosystem touchpoints in open source contribution patterns and language growth, summarized below.

In Summary
Here are some other summarized takeaways from the Octoverse 2025 report relevant to Microsoft-focused developers and teams:

• TypeScript's New No. 1 Spot (Contributor-Based): In August 2025, TypeScript overtook Python and JavaScript to become the most used language on GitHub by distinct monthly contributors. The report counts 2,636,006 monthly TypeScript contributors (+~1.05M YoY; 66.63%). It attributes the jump to typed-language reliability with agents/Copilot and to default TypeScript scaffolding across major frameworks. The snapshot uses same-month YoY comparisons (Aug 2025 vs. Aug 2024) to control for seasonality.
• C# Growth Remains Solid: C# ranks No. 5 in the language table by YoY contributor gains, adding 136,735 contributors (22.22% YoY, Aug-over-Aug). In the core-stacks view of new projects, C# appears among the six languages used by nearly 80% of new repositories, with 1,478,463 repositories and 10.61% growth over the past year. The report characterizes C# as steady in enterprise, desktop, and game-dev scenarios, with AI features being folded into existing .NET workflows rather than prompting a wholesale language shift.
• VS Code's Persistent Pull in Open Source: In the top projects by contributors, microsoft/vscode ranks No. 2 overall. The report also lists microsoft/vscode among the most popular destinations for first-time open source contributors, reflecting the scale and visibility of the editor's ecosystem and contribution opportunities.
• Copilot Adoption Among New Developers: Nearly 80% of new GitHub users used Copilot in their first week, indicating AI assistance is now a standard expectation rather than an advanced feature. The report also highlights agentic workflows gaining traction, with over 1 million pull requests authored by the Copilot coding agent between May and September 2025.
• Enterprise Reality: Private Repos Dominate Activity: The report shows ~81.5% of contributions happened in private repositories during 2025, with private repos growing ~33% year over year vs. ~19% for public. For Microsoft-tooling users operating in enterprise environments, this aligns with typical GitHub Enterprise and Azure DevOps + GitHub integrations, where day-to-day work happens privately while leveraging public open source libraries and frameworks.
• Notebooks and Dockerfiles Up Sharply (Pipelines Touching VS Code): Repositories using Jupyter Notebooks grew to ~2.42 million (+75% YoY) and those with Dockerfiles to ~1.9 million (+120% YoY). While not Microsoft-specific, these patterns map to common VS Code workflows for AI experiments, containerized services, and reproducible dev setups.

Overall, GitHub's contributor-based snapshot positions TypeScript at the center of modern development in 2025, with typed-language benefits lining up with the realities of AI-assisted coding. For Microsoft-focused teams, that means a continued emphasis on TypeScript and C#, with VS Code and Visual Studio sitting at the intersection of typed contracts, Copilot, and mainstream AI development practices.