code: function optimiseMemberExpression(parent, offset) {
    if (offset === 0) return;
  
    var newExpr;
    var prop = parent.property;
  
    if (t.isLiteral(prop)) {
      prop.value += offset;
      prop.raw = String(prop.value);
    } else {
      // // UnaryExpression, BinaryExpression
      newExpr = t.binaryExpression("+", prop, t.literal(offset));
      parent.property = newExpr;
    }
  }
docs: [Please add a description.]