From c3aaa62e9e4ef27a37e1c1a655b6f74ba146fd6a Mon Sep 17 00:00:00 2001
From: Carmine DiMascio <cdimascio@tripadvisor.com>
Date: Sun, 19 Apr 2020 11:08:25 -0400
Subject: [PATCH] improve error handling for missing/mistyped route mappings

---
 package-lock.json | 2 +-
 package.json      | 2 +-
 src/index.ts      | 3 +++
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 062aa538..ff6829ba 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "express-openapi-validator",
-  "version": "3.12.1",
+  "version": "3.12.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 77834a3f..2c3b1806 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "express-openapi-validator",
-  "version": "3.12.1",
+  "version": "3.12.2",
   "description": "Automatically validate API requests and responses with OpenAPI 3 and Express.",
   "main": "dist/index.js",
   "scripts": {
diff --git a/src/index.ts b/src/index.ts
index 874f1d2d..f7e010b0 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -249,6 +249,9 @@ export class OpenApiValidator {
           }
         }
         const fn = tmpModules[modulePath][oId];
+        if (!tmpModules[modulePath][oId]) {
+          throw Error(`Could not resolve 'x-eov-operation-handler' function in module '${modulePath}' for with id '${oId}'. Make sure a function exists for id '${oId}'.`)
+      }
         app[method.toLowerCase()](expressRoute, fn);
       }
     }