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TSSL -- TypeScript to SSL Transpiler

TSSL is a TypeScript subset that transpiles to Fallout SSL (Star-Trek Scripting Language). It lets you write Fallout 1/2 game scripts using TypeScript syntax with full IDE support -- type checking, autocomplete, go-to-definition, and module imports -- while targeting the same runtime as hand-written SSL.

.tssl files are bundled with esbuild, converted to .ssl via the transpiler, then compiled to .int bytecode by sslc.

How It Works

  1. You write .tssl files using a subset of TypeScript
  2. Transpiler converts .tssl to .ssl, the resulting file is written next to the source
  3. sslc compiles the .ssl to .int for the Fallout engine

Engine builtins and sfall functions are provided by folib as typed declarations.

Guides

  • Writing TSSL -- Comprehensive reference for all supported syntax, forbidden constructs, and gotchas
  • Converting SSL to TSSL -- Step-by-step migration guide from existing SSL scripts
  • LLM Reference -- Compact reference optimized for LLM context windows (copy into your project for AI-assisted coding)