Node.js template literal function for executing code in sandbox environment

js-literal.example.ts

import { js } from './js-literal';

// easy call
let result = js()`1`;

// auto context
let result2 = js()`${result}`;
assert(result === result2);

// auto context, objects
let a = { hello: true };
js()`${a}.hello = false`;
console.log(a.hello); // false

// runInContext parameters
try {
  js({ timeout: 500 })`while(true) {}`;
} catch(e) {
  console.log('timeout!!');
}


// context
js()`x = 1; this`; // { x: 1 }

// debug
let x = 10;
js({ debug: true })`x = ${x}; this`; // 'x = var_0; this'
js()`x = ${x}; this`; // { var_0: 30, x: 30 }

js-literal.ts

import vm from 'vm';

export function js(options?: string | vm.RunningScriptOptions) {
  return (text: TemplateStringsArray, ...values) => {
    const context = {};
    const code = values.reduce((o, key, i) => {
      let name = 'var_' + i;
      context[name] = key;
      o.push(name, text[i + 1]);
      return o;
    }, [text[0]]).join('');
    
    if (options && options.debug) return code;
    return vm.runInContext(code, vm.createContext(context), options);
  }
}