From 5a0215987a96110c525a706315affa451919458f Mon Sep 17 00:00:00 2001
From: djmaze <djmaze@djmaze.lan>
Date: Wed, 28 Oct 2020 20:19:38 +0100
Subject: [PATCH] knockoutjs replaced slow obj.__proto__ with
 Object.setPrototypeOf()

---
 .../build/output/knockout-latest.debug.js     |  44 +----
 .../knockout/build/output/knockout-latest.js  | 169 +++++++++---------
 .../src/subscribables/dependentObservable.js  |  10 +-
 .../knockout/src/subscribables/observable.js  |  10 +-
 .../src/subscribables/observableArray.js      |   6 +-
 .../src/subscribables/subscribable.js         |   6 +-
 vendors/knockout/src/utils.js                 |  12 --
 7 files changed, 100 insertions(+), 157 deletions(-)

diff --git a/vendors/knockout/build/output/knockout-latest.debug.js b/vendors/knockout/build/output/knockout-latest.debug.js
index d7bfefb67..76370956c 100644
--- a/vendors/knockout/build/output/knockout-latest.debug.js
+++ b/vendors/knockout/build/output/knockout-latest.debug.js
@@ -41,10 +41,6 @@ ko.utils = (() => {
             source && Object.entries(source).forEach(prop => target[prop[0]] = prop[1]);
             return target;
         },
-        setPrototypeOf = (obj, proto) => {
-            obj.__proto__ = proto;
-            return obj;
-        },
         // For details on the pattern for changing node classes
         // see: https://github.com/knockout/knockout/issues/1597
         toggleDomNodeCssClass = (node, classNames, shouldHaveClass) => {
@@ -56,8 +52,6 @@ ko.utils = (() => {
             }
         };
 
-    var canSetPrototype = ({ __proto__: [] } instanceof Array);
-
     return {
         arrayRemoveItem: (array, itemToRemove) => {
             var index = array.indexOf(itemToRemove);
@@ -69,14 +63,8 @@ ko.utils = (() => {
             }
         },
 
-        canSetPrototype: canSetPrototype,
-
         extend: extend,
 
-        setPrototypeOf: setPrototypeOf,
-
-        setPrototypeOfOrExtend: canSetPrototype ? setPrototypeOf : extend,
-
         objectForEach: objectForEach,
 
         objectMap: (source, mapping, mappingOwner) => {
@@ -614,7 +602,7 @@ ko.subscription.prototype.disposeWhenNodeIsRemoved = function (node) {
 };
 
 ko.subscribable = function () {
-    ko.utils.setPrototypeOfOrExtend(this, ko_subscribable_fn);
+    Object.setPrototypeOf(this, ko_subscribable_fn);
     ko_subscribable_fn.init(this);
 }
 
@@ -774,9 +762,7 @@ ko.exportProperty(ko_subscribable_fn, 'getSubscriptionsCount', ko_subscribable_f
 // For browsers that support proto assignment, we overwrite the prototype of each
 // observable instance. Since observables are functions, we need Function.prototype
 // to still be in the prototype chain.
-if (ko.utils.canSetPrototype) {
-    ko.utils.setPrototypeOf(ko_subscribable_fn, Function.prototype);
-}
+Object.setPrototypeOf(ko_subscribable_fn, Function.prototype);
 
 ko.subscribable['fn'] = ko_subscribable_fn;
 
@@ -866,14 +852,10 @@ ko.observable = initialValue => {
     observable[observableLatestValue] = initialValue;
 
     // Inherit from 'subscribable'
-    if (!ko.utils.canSetPrototype) {
-        // 'subscribable' won't be on the prototype chain unless we put it there directly
-        ko.utils.extend(observable, ko.subscribable['fn']);
-    }
     ko.subscribable['fn'].init(observable);
 
     // Inherit from 'observable'
-    ko.utils.setPrototypeOfOrExtend(observable, observableFn);
+    Object.setPrototypeOf(observable, observableFn);
 
     return observable;
 }
@@ -895,9 +877,7 @@ var observableFn = {
 
 // Note that for browsers that don't support proto assignment, the
 // inheritance chain is created manually in the ko.observable constructor
-if (ko.utils.canSetPrototype) {
-    ko.utils.setPrototypeOf(observableFn, ko.subscribable['fn']);
-}
+Object.setPrototypeOf(observableFn, ko.subscribable['fn']);
 
 var protoProperty = ko.observable.protoProperty = '__ko_proto__';
 observableFn[protoProperty] = ko.observable;
@@ -927,7 +907,7 @@ ko.observableArray = initialValues => {
         throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");
 
     var result = ko.observable(initialValues);
-    ko.utils.setPrototypeOfOrExtend(result, ko.observableArray['fn']);
+    Object.setPrototypeOf(result, ko.observableArray['fn']);
     return result.extend({'trackArrayChanges':true});
 };
 
@@ -979,9 +959,7 @@ ko.observableArray['fn'] = {
 
 // Note that for browsers that don't support proto assignment, the
 // inheritance chain is created manually in the ko.observableArray constructor
-if (ko.utils.canSetPrototype) {
-    ko.utils.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']);
-}
+Object.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']);
 
 // Populate ko.observableArray.fn with read/write functions from native arrays
 // Important: Do not add any additional functions here that may reasonably be used to *read* data from the array
@@ -1233,14 +1211,10 @@ ko.computed = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, opt
     computedObservable.hasWriteFunction = typeof writeFunction === "function";
 
     // Inherit from 'subscribable'
-    if (!ko.utils.canSetPrototype) {
-        // 'subscribable' won't be on the prototype chain unless we put it there directly
-        ko.utils.extend(computedObservable, ko.subscribable['fn']);
-    }
     ko.subscribable['fn'].init(computedObservable);
 
     // Inherit from 'computed'
-    ko.utils.setPrototypeOfOrExtend(computedObservable, computedFn);
+    Object.setPrototypeOf(computedObservable, computedFn);
 
     if (options['pure']) {
         state.pure = true;
@@ -1659,9 +1633,7 @@ var deferEvaluationOverrides = {
 
 // Note that for browsers that don't support proto assignment, the
 // inheritance chain is created manually in the ko.computed constructor
-if (ko.utils.canSetPrototype) {
-    ko.utils.setPrototypeOf(computedFn, ko.subscribable['fn']);
-}
+Object.setPrototypeOf(computedFn, ko.subscribable['fn']);
 
 // Set the proto values for ko.computed
 var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
diff --git a/vendors/knockout/build/output/knockout-latest.js b/vendors/knockout/build/output/knockout-latest.js
index c07c75a3f..a7d63949d 100644
--- a/vendors/knockout/build/output/knockout-latest.js
+++ b/vendors/knockout/build/output/knockout-latest.js
@@ -4,88 +4,87 @@
  * License: MIT (http://www.opensource.org/licenses/mit-license.php)
  */
 
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+{ia:K,Na:a.ga(n++)};v.push(A);x||z.push(A)}function q(K){A=u[K];n!==A.Na.D()&&F.push(A);A.Na(n++);a.a.va(A.R,f);v.push(A)}function p(K,L){if(K)for(var M=0,C=L.length;M<C;M++)L[M].R.forEach(S=>K(S,M,L[M].ia))}k=k||[];"undefined"==typeof k.length&&(k=[k]);e=e||{};var u=a.a.b.get(f,b),x=!u,v=[],w=0,n=0,r=[],t=[],y=[],F=[],z=[],B=0;if(x)k.forEach(m);else{if(!h||u&&u._countWaitingForRemove)h=Array.prototype.map.call(u,K=>K.ia),h=a.a.Sb(h,k,{dontLimitMoves:e.dontLimitMoves,sparse:!0});for(let K=0,L,M,C;L=
+h[K];K++)switch(M=L.moved,C=L.index,L.status){case "deleted":for(;w<C;)q(w++);if(void 0===M){var A=u[w];A.bb&&(A.bb.s(),A.bb=void 0);a.a.va(A.R,f).length&&(e.beforeRemove&&(v.push(A),B++,A.ia===d?A=null:y.push(A)),A&&r.push.apply(r,A.R))}w++;break;case "added":for(;n<C;)q(w++);void 0!==M?(t.push(v.length),q(M)):m(L.value)}for(;n<k.length;)q(w++);v._countWaitingForRemove=B}a.a.b.set(f,b,v);p(e.beforeMove,F);r.forEach(e.beforeRemove?a.ja:a.removeNode);var H,N;B=f.ownerDocument.activeElement;if(t.length)for(;void 0!=
+(k=t.shift());){A=v[k];for(H=void 0;k;)if((N=v[--k].R)&&N.length){H=N[N.length-1];break}for(w=0;r=A.R[w];H=r,w++)a.h.ac(f,r,H)}for(k=0;A=v[k];k++){A.R||a.a.extend(A,c(f,l,A.ia,g,A.Na));for(w=0;r=A.R[w];H=r,w++)a.h.ac(f,r,H);!A.Gc&&g&&(g(A.ia,A.R,A.Na),A.Gc=!0,H=A.R[A.R.length-1])}B&&f.ownerDocument.activeElement!=B&&B.focus();p(e.beforeRemove,y);for(k=0;k<y.length;++k)y[k].ia=d;p(e.afterMove,F);p(e.afterAdd,z)}})();D.ko=Z})(this);
diff --git a/vendors/knockout/src/subscribables/dependentObservable.js b/vendors/knockout/src/subscribables/dependentObservable.js
index 5107a114a..0a9003a28 100644
--- a/vendors/knockout/src/subscribables/dependentObservable.js
+++ b/vendors/knockout/src/subscribables/dependentObservable.js
@@ -59,14 +59,10 @@ ko.computed = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, opt
     computedObservable.hasWriteFunction = typeof writeFunction === "function";
 
     // Inherit from 'subscribable'
-    if (!ko.utils.canSetPrototype) {
-        // 'subscribable' won't be on the prototype chain unless we put it there directly
-        ko.utils.extend(computedObservable, ko.subscribable['fn']);
-    }
     ko.subscribable['fn'].init(computedObservable);
 
     // Inherit from 'computed'
-    ko.utils.setPrototypeOfOrExtend(computedObservable, computedFn);
+    Object.setPrototypeOf(computedObservable, computedFn);
 
     if (options['pure']) {
         state.pure = true;
@@ -485,9 +481,7 @@ var deferEvaluationOverrides = {
 
 // Note that for browsers that don't support proto assignment, the
 // inheritance chain is created manually in the ko.computed constructor
-if (ko.utils.canSetPrototype) {
-    ko.utils.setPrototypeOf(computedFn, ko.subscribable['fn']);
-}
+Object.setPrototypeOf(computedFn, ko.subscribable['fn']);
 
 // Set the proto values for ko.computed
 var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
diff --git a/vendors/knockout/src/subscribables/observable.js b/vendors/knockout/src/subscribables/observable.js
index b1cc5da9e..34fffa771 100644
--- a/vendors/knockout/src/subscribables/observable.js
+++ b/vendors/knockout/src/subscribables/observable.js
@@ -23,14 +23,10 @@ ko.observable = initialValue => {
     observable[observableLatestValue] = initialValue;
 
     // Inherit from 'subscribable'
-    if (!ko.utils.canSetPrototype) {
-        // 'subscribable' won't be on the prototype chain unless we put it there directly
-        ko.utils.extend(observable, ko.subscribable['fn']);
-    }
     ko.subscribable['fn'].init(observable);
 
     // Inherit from 'observable'
-    ko.utils.setPrototypeOfOrExtend(observable, observableFn);
+    Object.setPrototypeOf(observable, observableFn);
 
     return observable;
 }
@@ -52,9 +48,7 @@ var observableFn = {
 
 // Note that for browsers that don't support proto assignment, the
 // inheritance chain is created manually in the ko.observable constructor
-if (ko.utils.canSetPrototype) {
-    ko.utils.setPrototypeOf(observableFn, ko.subscribable['fn']);
-}
+Object.setPrototypeOf(observableFn, ko.subscribable['fn']);
 
 var protoProperty = ko.observable.protoProperty = '__ko_proto__';
 observableFn[protoProperty] = ko.observable;
diff --git a/vendors/knockout/src/subscribables/observableArray.js b/vendors/knockout/src/subscribables/observableArray.js
index 42e9be4b1..9c9a5f8e2 100644
--- a/vendors/knockout/src/subscribables/observableArray.js
+++ b/vendors/knockout/src/subscribables/observableArray.js
@@ -5,7 +5,7 @@ ko.observableArray = initialValues => {
         throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");
 
     var result = ko.observable(initialValues);
-    ko.utils.setPrototypeOfOrExtend(result, ko.observableArray['fn']);
+    Object.setPrototypeOf(result, ko.observableArray['fn']);
     return result.extend({'trackArrayChanges':true});
 };
 
@@ -57,9 +57,7 @@ ko.observableArray['fn'] = {
 
 // Note that for browsers that don't support proto assignment, the
 // inheritance chain is created manually in the ko.observableArray constructor
-if (ko.utils.canSetPrototype) {
-    ko.utils.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']);
-}
+Object.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']);
 
 // Populate ko.observableArray.fn with read/write functions from native arrays
 // Important: Do not add any additional functions here that may reasonably be used to *read* data from the array
diff --git a/vendors/knockout/src/subscribables/subscribable.js b/vendors/knockout/src/subscribables/subscribable.js
index acd9ec269..64dad9153 100644
--- a/vendors/knockout/src/subscribables/subscribable.js
+++ b/vendors/knockout/src/subscribables/subscribable.js
@@ -27,7 +27,7 @@ ko.subscription.prototype.disposeWhenNodeIsRemoved = function (node) {
 };
 
 ko.subscribable = function () {
-    ko.utils.setPrototypeOfOrExtend(this, ko_subscribable_fn);
+    Object.setPrototypeOf(this, ko_subscribable_fn);
     ko_subscribable_fn.init(this);
 }
 
@@ -187,9 +187,7 @@ ko.exportProperty(ko_subscribable_fn, 'getSubscriptionsCount', ko_subscribable_f
 // For browsers that support proto assignment, we overwrite the prototype of each
 // observable instance. Since observables are functions, we need Function.prototype
 // to still be in the prototype chain.
-if (ko.utils.canSetPrototype) {
-    ko.utils.setPrototypeOf(ko_subscribable_fn, Function.prototype);
-}
+Object.setPrototypeOf(ko_subscribable_fn, Function.prototype);
 
 ko.subscribable['fn'] = ko_subscribable_fn;
 
diff --git a/vendors/knockout/src/utils.js b/vendors/knockout/src/utils.js
index 94da27d24..3000975a3 100644
--- a/vendors/knockout/src/utils.js
+++ b/vendors/knockout/src/utils.js
@@ -7,10 +7,6 @@ ko.utils = (() => {
             source && Object.entries(source).forEach(prop => target[prop[0]] = prop[1]);
             return target;
         },
-        setPrototypeOf = (obj, proto) => {
-            obj.__proto__ = proto;
-            return obj;
-        },
         // For details on the pattern for changing node classes
         // see: https://github.com/knockout/knockout/issues/1597
         toggleDomNodeCssClass = (node, classNames, shouldHaveClass) => {
@@ -22,8 +18,6 @@ ko.utils = (() => {
             }
         };
 
-    var canSetPrototype = ({ __proto__: [] } instanceof Array);
-
     return {
         arrayRemoveItem: (array, itemToRemove) => {
             var index = array.indexOf(itemToRemove);
@@ -35,14 +29,8 @@ ko.utils = (() => {
             }
         },
 
-        canSetPrototype: canSetPrototype,
-
         extend: extend,
 
-        setPrototypeOf: setPrototypeOf,
-
-        setPrototypeOfOrExtend: canSetPrototype ? setPrototypeOf : extend,
-
         objectForEach: objectForEach,
 
         objectMap: (source, mapping, mappingOwner) => {