Hermes aims to be a drop in replacement and extension for JS to allow for seamless opt in for WASM targeting. It will be a super set of JS, with additional opt in features to improve performance. With Hermes, you will be able to take any existing JS package and easily compile it with minimal overhead. The benefit of this is ultimatley that the developer will be able to access the existing massive ecosystem of JS packages, whilst being able to write JS interopable code.

Roadmap

Emulated JS Compiler

1. AST Lowering
   • Reader
   • Lexer
   • Parser
2. HLIR Lowering
   • Structural Type Inferencing and Checking
3. MLIR Lowering
4. LLVM Lowering
   • CodeGen

Feature Enhanced Compiler

• Traits
• Explicit References
• Structural Type Inferencing

StdLib

• JS Interpreter Runtime Standard Library Compatibility
  • NodeJS
  • BunJS
  • Deno
  • Just
  • Txiki
  • Napa
  • Elsa
  • Window
  • Additional Features

Built-In Testing Library

• Syntactic similarity to Jest

Package Manager

• API Compatibility with existing JS Package Managers (NPM, Yarn, ect...)
• API for accessing Hermes-first packages

Toolchain Extensions

• Conversion tool (TS -> JS -> Hermes)

Documentation

Links

WASM

• WASM Specification

Javascript

• Javascript Specification
• ECMAScript Specification

LLVM

• LLVM Specification
• llvm-sys
• llvmenv