From fa5476e486e9ca90a8271c60faf7efec0e4566e7 Mon Sep 17 00:00:00 2001
From: djmaze <djmaze@djmaze.lan>
Date: Fri, 22 Jan 2021 09:46:04 +0100
Subject: [PATCH] Added support for 'length' property to Knockout observable

---
 .../build/output/knockout-latest.debug.js     |  16 +-
 .../knockout/build/output/knockout-latest.js  | 159 +++++++++---------
 .../knockout/src/subscribables/observable.js  |  16 +-
 3 files changed, 108 insertions(+), 83 deletions(-)

diff --git a/vendors/knockout/build/output/knockout-latest.debug.js b/vendors/knockout/build/output/knockout-latest.debug.js
index fbd14a3d6..999a758fe 100644
--- a/vendors/knockout/build/output/knockout-latest.debug.js
+++ b/vendors/knockout/build/output/knockout-latest.debug.js
@@ -788,7 +788,8 @@ ko.computedContext = ko.dependencyDetection = (() => {
         }
     };
 })();
-var observableLatestValue = Symbol('_latestValue');
+const observableLatestValue = Symbol('_latestValue'),
+	length = 'length';
 
 ko.observable = initialValue => {
     function observable() {
@@ -812,6 +813,17 @@ ko.observable = initialValue => {
 
     observable[observableLatestValue] = initialValue;
 
+    Object.defineProperty(observable, length, {
+        get: () => length in observable[observableLatestValue] ? observable[observableLatestValue][length] : undefined,
+        set: function(value) {
+			if (length in observable[observableLatestValue]) {
+				this.valueWillMutate();
+				observable[observableLatestValue][length] = value;
+				this.valueHasMutated();
+			}
+        }
+    });
+
     // Inherit from 'subscribable'
     ko.subscribable['fn'].init(observable);
 
@@ -825,7 +837,7 @@ ko.observable = initialValue => {
 var observableFn = {
     'toJSON': function() {
         let value = this[observableLatestValue];
-        return value.toJSON ? value.toJSON() : value;
+        return value && value.toJSON ? value.toJSON() : value;
     },
     'equalityComparer': valuesArePrimitiveAndEqual,
     peek: function() { return this[observableLatestValue]; },
diff --git a/vendors/knockout/build/output/knockout-latest.js b/vendors/knockout/build/output/knockout-latest.js
index 7f834bd96..ce162d7e8 100644
--- a/vendors/knockout/build/output/knockout-latest.js
+++ b/vendors/knockout/build/output/knockout-latest.js
@@ -4,85 +4,86 @@
  * License: MIT (http://www.opensource.org/licenses/mit-license.php)
  */
 
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diff --git a/vendors/knockout/src/subscribables/observable.js b/vendors/knockout/src/subscribables/observable.js
index 34fffa771..0d89c7c8f 100644
--- a/vendors/knockout/src/subscribables/observable.js
+++ b/vendors/knockout/src/subscribables/observable.js
@@ -1,4 +1,5 @@
-var observableLatestValue = Symbol('_latestValue');
+const observableLatestValue = Symbol('_latestValue'),
+	length = 'length';
 
 ko.observable = initialValue => {
     function observable() {
@@ -22,6 +23,17 @@ ko.observable = initialValue => {
 
     observable[observableLatestValue] = initialValue;
 
+    Object.defineProperty(observable, length, {
+        get: () => length in observable[observableLatestValue] ? observable[observableLatestValue][length] : undefined,
+        set: function(value) {
+			if (length in observable[observableLatestValue]) {
+				this.valueWillMutate();
+				observable[observableLatestValue][length] = value;
+				this.valueHasMutated();
+			}
+        }
+    });
+
     // Inherit from 'subscribable'
     ko.subscribable['fn'].init(observable);
 
@@ -35,7 +47,7 @@ ko.observable = initialValue => {
 var observableFn = {
     'toJSON': function() {
         let value = this[observableLatestValue];
-        return value.toJSON ? value.toJSON() : value;
+        return value && value.toJSON ? value.toJSON() : value;
     },
     'equalityComparer': valuesArePrimitiveAndEqual,
     peek: function() { return this[observableLatestValue]; },