docs: function buildConcatCallExpressions(items) {
      let avail = true;
      return items.reduce(function(left, right) {
        let canBeInserted = t.isLiteral(right);
  
        if (!canBeInserted && avail) {
          canBeInserted = true;
          avail = false;
        }
        if (canBeInserted && t.isCallExpression(left)) {
          left.arguments.push(right);
          return left;
        }
        return t.callExpression(
          t.memberExpression(left, t.identifier("concat")),
          [right],
        );
      });
    }