acutmore / TypeScriptVM

Compile-time emulation of a 4-bit Virtual Machine using TypeScript's Type System

Original gist: https://gist.github.com/acutmore/9d2ce837f019608f26ff54e0b1c23d6e

A 4-Bit Virtual Machine implemented in TypeScript's type system. Capable of running a sample 'FizzBuzz' program.

Syntax emits zero JavaScript.

type RESULT = VM<
  [
    ["push", N_1],         // 1
    ["push", False],       // 2
    ["peek", _],           // 3
    ["mod", N_3],          // 4
    ["ifNZero", Line<8>],  // 5
    ["replace", True],     // 6
    ["print", "fizz"],     // 7
    ["peek", _],           // 8
    ["mod", N_5],          // 9
    ["ifNZero", Line<13>], // 10
    ["replace", True],     // 11
    ["print", "buzz"],     // 12
    ["ifNZero", Line<15>], // 13
    ["printHead", _],      // 14
    ["eq", N_15],          // 15
    ["ifNZero", Line<19>], // 16
    ["inc", _],            // 17
    ["jump", Line<2>],     // 18
    ["pop", _],            // 19
    ["stop", _]            // 20
  ]
>;
// RESULT['stdOut'] ==
// [1, 2, "fizz", 4, "buzz", "fizz", 7, 8, "fizz", "buzz", 11, "fizz", 13, 14, "fizz", "buzz"];

Demo

Inspired by

• TypeScripts Type System is Turing Complete
• How to master advanced TypeScript patterns

Notes:

• requires Typescript >= v3.3.3
• requires "strict": true in tsconfig.json