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.ts

Low risk

TypeScript

Microsoft's typed superset of JavaScript. The de-facto standard for serious front-end and Node.js projects.

MIME types

  • application/typescript
  • text/typescript

Category

code

Aliases

.tsx / .mts / .cts

What opens this file

  • VS Code
  • WebStorm
  • Neovim + LSP

How to open by OS

Windows

  • Node.js with `tsc`, Bun, or Deno.

Mac

  • Same.

Linux

  • Same.

Ios

  • Working Copy.

Android

  • Acode.

Safety notes

  • The runtime payload is the compiled JavaScript, so the .ts file itself is rarely executed. Malicious .d.ts declarations can silently erode type safety.

Common mistakes

  • Confusing any with unknown and reaching for any everywhere — loses the core value of the type system.
  • Keeping tsconfig.json strict off in production. Enable it to get meaningful guarantees.

Related extensions

References