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Major Companies Are Switching to TypeScript: The Main Trend of 2025
2025 has been marked by a new wave of technological migrations: more and more large corporations and tech giants are moving their key projects from JavaScript to TypeScript. This language, developed by Microsoft, has long outgrown its status as a "superset of JS" and has become the standard for enterprise development. Why is big business betting on TypeScript right now, and what does this mean for developers?
Why TypeScript? Three Main Reasons
Analysts highlight three key factors that pushed corporations toward mass migration in 2025:
- Reliability and predictability of the codebase. Strict static typing allows errors to be caught at compile time rather than at runtime. For projects with millions of lines of code, this is critically important: it reduces the number of bugs in production and simplifies refactoring and maintenance of legacy code.
- Faster onboarding for new developers. TypeScript acts as "living documentation." New employees understand the project structure and data types more quickly, reducing the adaptation time from several weeks to several days.
- Ecosystem and performance. Modern tools (VS Code, ESLint, Prettier) provide top-quality autocomplete and code analysis. Additionally, with the release of TypeScript 5.x and improved support for ESM, compilation performance has increased by 30-40% compared to versions from two years ago.
Case Studies: Who Has Already Made the Switch in 2025
The list of companies that announced a full or partial transition to TypeScript in 2025 is impressive. For example, Airbnb completed the migration of its frontend stack, reducing the number of critical errors by 28%. Stripe rewrote its SDK library for payment processing in TypeScript, noting improvements in readability and development speed. Even the conservative LinkedIn migrated its notification system, which processes over 1.5 billion events per day, to TypeScript. The financial sector is also keeping pace: JPMorgan Chase and Revolut are actively implementing TypeScript in backend services on Node.js, valuing it for type safety when working with sensitive data.
According to the State of JS 2025 survey, the share of developers using TypeScript as their primary language has exceeded 65% for the first time. Meanwhile, 89% of respondents from large companies (1000+ employees) stated that they plan to expand its use over the next two years.
What Does This Mean for Developers?
The 2025 trend is a clear signal for the IT community: knowledge of TypeScript is becoming a mandatory requirement, not just a "plus" on a resume. The job market on hh.ru and LinkedIn shows a 40% increase in vacancies requiring TypeScript compared to 2024. For those not yet familiar with the language, now is the best time to learn it: extensive documentation, powerful tools, and community support make the entry barrier minimal.
TypeScript has finally ceased to be an "experiment" or a "niche tool." In 2025, it has become the foundation of corporate development, providing a balance between the flexibility of JavaScript and the rigor of static typing. If your project is still running on plain JS, it might be time to consider migrating.
