From 2e43f7f32521357afcaaa70e576fcbda8d869e14 Mon Sep 17 00:00:00 2001
From: Christian Walther <walther@indel.ch>
Date: Wed, 25 Sep 2019 14:31:46 +0200
Subject: [PATCH 1/2] When a ref cannot be resolved, don't get stuck and render
 nothing, but render what is available.

---
 src/index.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/index.js b/src/index.js
index 5e40ba4..eced32a 100644
--- a/src/index.js
+++ b/src/index.js
@@ -404,13 +404,13 @@ const highlight = false;
 
             var refs = {};
             var get_ref = function(uri) {
-                return new Promise( resolve => {
+                return new Promise( (resolve, reject) => {
                     get_document( uri.clone().hash('').toString() ).then(function(schema){
                     refs[uri.toString()] = uri.hash() ? jsonpointer.get( schema, uri.hash() ) : schema;
                 }).then(function(){ 
                     debug('get_ref');
                     resolve();
-                });
+                }, reject);
                 });
             };
 

From aeb3ff81859393f548329f857ce56b416235e466 Mon Sep 17 00:00:00 2001
From: Christian Walther <walther@indel.ch>
Date: Wed, 25 Sep 2019 14:32:49 +0200
Subject: [PATCH 2/2] Avoid unhandled promise rejections when refs cannot be
 resolved.

---
 src/index.js | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/index.js b/src/index.js
index eced32a..1bbad72 100644
--- a/src/index.js
+++ b/src/index.js
@@ -543,11 +543,15 @@ const highlight = false;
                     // use the normalized uri
                     parentObject.update( uri.toString() );
 
-                    debug(get_ref(uri));
-                    get_ref( uri ).finally( () => {
+                    var refp = get_ref(uri);
+                    debug(refp);
+                    refp.finally( () => {
                         throttled_render();
                         resolve();
-                    });
+                    })
+                    // avoid "unhandled rejection" error - the output may be redundant as the
+                    // browser probably already logged the failure, but better be explicit
+                    .catch(e => { console.warn("Unable to resolve $ref " + uri.toString() + ":", e); });
                 });
             }