localContext.js

function makeMakeEvaluateExpression() {
  function makeEvaluateExpression(evalInContext) {
    return function(expr) {
      return evalInContext(
        `({
          next: makeEvaluateExpression(function(expr) { return eval(expr); }),
          value: eval(${JSON.stringify(expr)})
        })`,
      );
    };
  }
  return makeEvaluateExpression(expr => eval(expr));
}

let next = makeMakeEvaluateExpression();
let value;
({next, value} = next('var i = 1;'));
({next, value} = next('i * 2'));
console.log(value);