/**
   * @fileoverview Warn when using template string syntax in regular strings
   * @author Jeroen Engels
   */
  "use strict";
  
  //------------------------------------------------------------------------------
  // Rule Definition
  //------------------------------------------------------------------------------
  
  module.exports = {
      meta: {
          docs: {
              description: "disallow template literal placeholder syntax in regular strings",
              category: "Possible Errors",
              recommended: false
          },
  
          schema: []
      },
  
      create(context) {
          const regex = /\$\{[^}]+\}/;
  
          return {
              Literal(node) {
                  if (typeof node.value === "string" && regex.test(node.value)) {
                      context.report({
                          node,
                          message: "Unexpected template string expression."
                      });
                  }
              }
          };
  
      }
  };