add hook for missing named route resolution

src/Illuminate/Routing/UrlGenerator.php

@@ -89,6 +89,13 @@ class UrlGenerator implements UrlGeneratorContract
      */
     protected $keyResolver;
 
+    /**
+     * The missing named route resolver callable.
+     *
+     * @var callable
+     */
+    protected $missingNamedRouteResolver;
+
     /**
      * The callback to use to format hosts.
      *
@@ -464,6 +471,11 @@ public function route($name, $parameters = [], $absolute = true)
             return $this->toRoute($route, $parameters, $absolute);
         }
 
+        if (! is_null($this->missingNamedRouteResolver) &&
+            ! is_null($url = call_user_func($this->missingNamedRouteResolver, $name, $parameters, $absolute))) {
+            return $url;
+        }
+
         throw new RouteNotFoundException("Route [{$name}] not defined.");
     }
 
@@ -820,6 +832,19 @@ public function withKeyResolver(callable $keyResolver)
         return (clone $this)->setKeyResolver($keyResolver);
     }
 
+    /**
+     * Set the callback that should be used to attempt to resolve missing named routes.
+     *
+     * @param  callable  $missingNamedRouteResolver
+     * @return $this
+     */
+    public function resolveMissingNamedRoutesUsing(callable $missingNamedRouteResolver)
+    {
+        $this->missingNamedRouteResolver = $missingNamedRouteResolver;
+
+        return $this;
+    }
+
     /**
      * Get the root controller namespace.
      *

tests/Routing/RoutingUrlGeneratorTest.php

@@ -908,6 +908,18 @@ public function testSignedUrlWithKeyResolver()
         $this->assertTrue($url2->hasValidSignature($request));
         $this->assertFalse($url->hasValidSignature($request));
     }
+
+    public function testMissingNamedRouteResolution()
+    {
+        $url = new UrlGenerator(
+            new RouteCollection,
+            Request::create('http://www.foo.com/')
+        );
+
+        $url->resolveMissingNamedRoutesUsing(fn ($name, $parameters, $absolute) => 'test-url');
+
+        $this->assertSame('test-url', $url->route('foo'));
+    }
 }
 
 class RoutableInterfaceStub implements UrlRoutable