Tsonic: TypeScript to C# Compiler Architecture Documentation
By
jeswin
Fresh out the oven, still warm. Top of the tray.
Summary
Tsonic is a compiler tool that transforms a strict subset of TypeScript into C# code, which can then be compiled into native binaries or .NET outputs. The article documents the current architecture as of April 2026, describing the main components including the tsonic compiler/CLI, JavaScript ambient surface (@tsonic/js), Node.js module support (@tsonic/nodejs), and Express framework integration (@tsonic/express). It serves as technical documentation for developers working with this TypeScript-to-C# compilation toolchain.
Key quotes
· 5 pulledTsonic compiles a strict, deterministic subset of TypeScript into C#, then builds native binaries or .NET outputs from that generated project.
This site documents the current April 2026 architecture.
tsonic is the compiler and CLI
@tsonic/js is the active JavaScript ambient surface
@tsonic/nodejs is a first-party TypeScript source package for Node-style modules
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