Lua WASM Bindings

Building

Important

The binding script doesn't include the entire Lua API, some effort might be needed to add missing features. For the complete Lua API reference, visit https://www.lua.org/manual/5.4/manual.html

Example

import { LUA_OK } from "lua-wasm-bindings/dist/lua";

import { lauxlib, lua, lualib } from "lua-wasm-bindings/dist/lua.54";

const luaCode = `return "Hello"`;
consol.log(executeLua(luaCode));

function executeLua(luaCode: string): string | Error | never {
  const L = lauxlib.luaL_newstate();
  lualib.luaL_openlibs(L);

  // Optional Load modules
  // lua.lua_getglobal(L, "package");
  // lua.lua_getfield(L, -1, "preload");
  // lauxlib.luaL_loadstring(L, jsonLib); // Load extenal package from string
  // lua.lua_setfield(L, -2, "json");

  const status = lauxlib.luaL_dostring(L, luaCode);

  if (status === LUA_OK) {
    if (lua.lua_isstring(L, -1)) {
      const result = lua.lua_tostring(L, -1);
      lua.lua_close(L);
      return result === null ? undefined : result;
    } else {
      const returnType = lua.lua_typename(L, lua.lua_type(L, -1));
      lua.lua_close(L);
      throw new Error(`Unsupported Lua return type: ${returnType}`);
    }
  } else {
    const luaStackString = lua.lua_tostring(L, -1);
    const message = luaStackString.replace(/^\[string "(--)?\.\.\."\]:\d+: /, "");
    lua.lua_close(L);
    return new Error(message);
  }
}