code: function isDeclarationOfFunctionExpression(s) {
          if (s.valueDeclaration && s.valueDeclaration.kind === 218 /* VariableDeclaration */) {
              var declaration = s.valueDeclaration;
              return declaration.initializer && declaration.initializer.kind === 179 /* FunctionExpression */;
          }
          return false;
      }
docs: Returns true if the node is a variable declaration whose initializer is a function expression.
  This function does not test if the node is in a JavaScript file or not.