diff --git a/vendors/knockout/src/binding/bindingAttributeSyntax.js b/vendors/knockout/src/binding/bindingAttributeSyntax.js
index 86bc34b0c..62a916c5b 100644
--- a/vendors/knockout/src/binding/bindingAttributeSyntax.js
+++ b/vendors/knockout/src/binding/bindingAttributeSyntax.js
@@ -13,7 +13,7 @@ ko.bindingHandlers = {};
 // The ko.bindingContext constructor is only called directly to create the root context. For child
 // contexts, use bindingContext.createChildContext or bindingContext.extend.
 ko.bindingContext = class {
-    constructor(dataItemOrAccessor, parentContext, dataItemAlias, extendCallback, options)
+    constructor(dataItemOrAccessor, parentContext, extendCallback, options)
     {
         var self = this,
             shouldInheritData = dataItemOrAccessor === inheritParentVm,
@@ -60,9 +60,6 @@ ko.bindingContext = class {
                 self['$data'] = dataItem;
             }
 
-            if (dataItemAlias)
-                self[dataItemAlias] = dataItem;
-
             // The extendCallback function is provided when creating a child context or extending a context.
             // It handles the specific actions needed to finish setting up the binding context. Actions in this
             // function could also add dependencies to this binding context.
@@ -107,21 +104,14 @@ ko.bindingContext = class {
     // But this does not mean that the $data value of the child context will also get updated. If the child
     // view model also depends on the parent view model, you must provide a function that returns the correct
     // view model on each update.
-   'createChildContext'(dataItemOrAccessor, dataItemAlias, extendCallback, options) {
-        if (!options && dataItemAlias && typeof dataItemAlias == "object") {
-            options = dataItemAlias;
-            dataItemAlias = options['as'];
-            extendCallback = options['extend'];
-        }
-
-        return new ko.bindingContext(dataItemOrAccessor, this, dataItemAlias, (self, parentContext) => {
+   'createChildContext'(dataItemOrAccessor, options) {
+        return new ko.bindingContext(dataItemOrAccessor, this, (self, parentContext) => {
             // Extend the context hierarchy by setting the appropriate pointers
             self['$parentContext'] = parentContext;
             self['$parent'] = parentContext['$data'];
             self['$parents'] = (parentContext['$parents'] || []).slice(0);
             self['$parents'].unshift(self['$parent']);
-            if (extendCallback)
-                extendCallback(self);
+            options['extend']?.(self);
         }, options);
     }
 
@@ -129,7 +119,7 @@ ko.bindingContext = class {
     // Similarly to "child" contexts, provide a function here to make sure that the correct values are set
     // when an observable view model is updated.
     'extend'(properties, options) {
-        return new ko.bindingContext(inheritParentVm, this, null, self =>
+        return new ko.bindingContext(inheritParentVm, this, self =>
             ko.utils.extend(self, typeof(properties) == "function" ? properties(self) : properties)
         , options);
     }
@@ -432,7 +422,7 @@ ko.storedBindingContextForNode = node => {
 function getBindingContext(viewModelOrBindingContext, extendContextCallback) {
     return viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)
         ? viewModelOrBindingContext
-        : new ko.bindingContext(viewModelOrBindingContext, undefined, undefined, extendContextCallback);
+        : new ko.bindingContext(viewModelOrBindingContext, null, extendContextCallback);
 }
 
 ko['applyBindingAccessorsToNode'] = (node, bindings, viewModelOrBindingContext) =>
diff --git a/vendors/knockout/src/binding/defaultBindings/foreach.js b/vendors/knockout/src/binding/defaultBindings/foreach.js
index 961132fc9..a1c5f25a8 100644
--- a/vendors/knockout/src/binding/defaultBindings/foreach.js
+++ b/vendors/knockout/src/binding/defaultBindings/foreach.js
@@ -16,8 +16,7 @@ ko.bindingHandlers['foreach'] = {
             // If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates
             ko.utils.unwrapObservable(modelValue);
             return {
-                'foreach': unwrappedValue['data'],
-                'as': unwrappedValue['as']
+                'foreach': unwrappedValue['data']
             };
     },
     'init': (element, valueAccessor) =>
diff --git a/vendors/knockout/src/binding/defaultBindings/ifIfnotWith.js b/vendors/knockout/src/binding/defaultBindings/ifIfnotWith.js
index 9a3636fed..b5e01407f 100644
--- a/vendors/knockout/src/binding/defaultBindings/ifIfnotWith.js
+++ b/vendors/knockout/src/binding/defaultBindings/ifIfnotWith.js
@@ -7,7 +7,7 @@ function makeWithIfBinding(bindingKey, isWith, isNot) {
             var savedNodes, contextOptions = {}, needAsyncContext;
 
             if (isWith) {
-                contextOptions = { 'as': allBindings.get('as'), 'exportDependencies': true };
+                contextOptions = { 'exportDependencies': true };
             }
 
             needAsyncContext = allBindings['has'](ko.bindingEvent.descendantsComplete);
diff --git a/vendors/knockout/src/templating/templating.js b/vendors/knockout/src/templating/templating.js
index ba4637be4..699ce092c 100644
--- a/vendors/knockout/src/templating/templating.js
+++ b/vendors/knockout/src/templating/templating.js
@@ -115,7 +115,7 @@
                     // Ensure we've got a proper binding context to work with
                     var bindingContext = (dataOrBindingContext instanceof ko.bindingContext)
                         ? dataOrBindingContext
-                        : new ko.bindingContext(dataOrBindingContext, null, null, null, { "exportDependencies": true });
+                        : new ko.bindingContext(dataOrBindingContext, null, null, { "exportDependencies": true });
 
                     var templateName = resolveTemplateName(template, bindingContext['$data'], bindingContext);
                     executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);
@@ -130,19 +130,13 @@
     ko.renderTemplateForEach = (template, arrayOrObservableArray, options, targetNode, parentBindingContext) => {
         // Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then
         // activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.
-        var arrayItemContext, asName = options['as'];
+        var arrayItemContext;
 
         // This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode
         var executeTemplateForArrayItem = (arrayValue, index) => {
             // Support selecting template as a function of the data being rendered
             arrayItemContext = parentBindingContext['createChildContext'](arrayValue, {
-                'as': asName,
-                'extend': context => {
-                    context['$index'] = index;
-                    if (asName) {
-                        context[asName + "Index"] = index;
-                    }
-                }
+                'extend': context => context['$index'] = index
             });
 
             var templateName = resolveTemplateName(template, arrayValue, arrayItemContext);
@@ -267,7 +261,6 @@
                 var innerBindingContext = bindingContext;
                 if ('data' in options) {
                     innerBindingContext = bindingContext['createChildContext'](options['data'], {
-                        'as': options['as'],
                         'exportDependencies': true
                     });
                 }