@microsoft/dynamicproto-js - npm Package Compare versions

Comparing version 1.1.5 to 1.1.6

lib/dist/amd/dynamicproto-js.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
@@ -57,6 +57,2 @@ */
     /**
-     * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
-     */
-    var DynProtoPolyProto = "_dynProto";
-    /**
      * Value used as the name of a class when it cannot be determined
@@ -72,2 +68,10 @@ * @ignore
     /**
+     * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
+     */
+    var DynProtoBaseProto = "_dyn" + str__Proto;
+    /**
+     * Track the current prototype for IE8 as you can't look back to get the prototype
+     */
+    var DynProtoCurrent = "_dynInstProto";
+    /**
      * Constant string defined to support minimization
@@ -89,2 +93,6 @@ * @ignore
     /**
+     * Pre-lookup to check for the existence of this function
+     */
+    var _objGetOwnProps = Obj["getOwnPropertyNames"];
+    /**
      * Internal Global used to generate a unique dynamic class name, every new class will increase this value
@@ -120,18 +128,20 @@ * @ignore
     function _getObjProto(target) {
+        var newProto;
         if (target) {
-            // This method doesn't existing in older browsers (e.g. IE8)
+            // This method doesn't exist in older browsers (e.g. IE8)
             if (_objGetPrototypeOf) {
                 return _objGetPrototypeOf(target);
             }
-            // target[Constructor] May break if the constructor has been changed or removed
-            var newProto = target[DynProtoPolyProto] || target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
-            if (newProto) {
-                // Set the _dynProto so the hierarchy can lookup base classes correctly on IE8
-                if (!target[DynProtoPolyProto]) {
-                    target[DynProtoPolyProto] = newProto;
-                }
-                return newProto;
+            var curProto = target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
+            // Using the pre-calculated value as IE8 doesn't support looking up the prototype of a prototype and thus fails for more than 1 base class
+            newProto = target[DynProtoBaseProto] || curProto;
+            if (!_hasOwnProperty(target, DynProtoBaseProto)) {
+                // As this prototype doesn't have this property then this is from an inherited class so newProto is the base to return so save it
+                // so we can look it up value (which for a multiple hierarchy dynamicProto will be the base class)
+                delete target[DynProtoCurrent]; // Delete any current value allocated to this instance so we pick up the value from prototype hierarchy
+                newProto = target[DynProtoBaseProto] = target[DynProtoCurrent] || target[DynProtoBaseProto];
+                target[DynProtoCurrent] = curProto;
             }
         }
-        return null;
+        return newProto;
     }
@@ -145,5 +155,4 @@ /**
         var props = [];
-        var getOwnProps = Obj["getOwnPropertyNames"];
-        if (getOwnProps) {
-            props = getOwnProps(target);
+        if (_objGetOwnProps) {
+            props = _objGetOwnProps(target);
         }
@@ -150,0 +159,0 @@ else {

lib/dist/amd/dynamicproto-js.min.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
  */
-define(function(){"use strict";var u="constructor",v="prototype",h="function",_="_dynInstFuncs",d="_isDynProxy",g="_dynClass",I="_dynInstChk",P=I,w="_dfOpts",r="_dynProto",e="_unknown_",i="__proto__",O="useBaseInst",m="setInstFuncs",o=Object,C=o.getPrototypeOf,F=0;function k(n,t){return n&&o[v].hasOwnProperty.call(n,t)}function b(n){return n&&(n===o[v]||n===Array[v])}function B(n){return b(n)||n===Function[v]}function D(n){if(n){if(C)return C(n);var t=n[r]||n[i]||n[v]||(n[u]?n[u][v]:null);if(t)return n[r]||(n[r]=t),t}return null}function $(n,t){var r=[],u=o.getOwnPropertyNames;if(u)r=u(n);else for(var e in n)"string"==typeof e&&k(n,e)&&r.push(e);if(r&&0<r.length)for(var i=0;i<r.length;i++)t(r[i])}function j(n,t,r){return t!==u&&typeof n[t]===h&&(r||k(n,t))}function x(n){throw new TypeError("DynamicProto: "+n)}function A(n,t){for(var r=n.length-1;0<=r;r--)if(n[r]===t)return 1}function E(n,t){return k(n,v)?n.name||t||e:((n||{})[u]||{}).name||t||e}function M(n,u,t,r){k(n,v)||x("theClass is an invalid class definition.");var e,i,o,f,s,a,c=n[v],l=(function(n){if(!C)return 1;for(var t=[],r=D(u);r&&!B(r)&&!A(t,r);){if(r===n)return 1;t.push(r),r=D(r)}}(c)||x("["+E(n)+"] is not in class hierarchy of ["+E(u)+"]"),null),n=(k(c,g)?l=c[g]:(l="_dynCls$"+E(n,"_")+"$"+F,F++,c[g]=l),M[w]),y=!!n[O],p=(y&&r&&r[O]!==undefined&&(y=!!r[O]),i={},$(e=u,function(n){!i[n]&&j(e,n,!1)&&(i[n]=e[n])}),i),y=(t(u,function(n,t,r,i){function u(n,t,r){var u,e=t[r];return e[d]&&i&&!1!==(u=n[_]||{})[P]&&(e=(u[t[g]]||{})[r]||e),function(){return e.apply(n,arguments)}}for(var e={},o=($(r,function(n){e[n]=u(t,r,n)}),D(n)),f=[];o&&!B(o)&&!A(f,o);)$(o,function(n){!e[n]&&j(o,n,!C)&&(e[n]=u(t,o,n))}),f.push(o),o=D(o);return e}(c,u,p,y)),!!C&&!!n[m]);o=c,t=l,f=u,s=p,n=!1!==(y=y&&r?!!r[m]:y),b(o)||(c=f[_]=f[_]||{},a=c[t]=c[t]||{},!1!==c[P]&&(c[P]=!!n),$(f,function(n){var r,u,e;j(f,n,!1)&&f[n]!==s[n]&&(a[n]=f[n],delete f[n],k(o,n)&&(!o[n]||o[n][d])||(o[n]=(r=o,u=n,(e=function(){var n,t;return(function(n,t,r,u){var e=null;if(n&&k(r,g)){var i=n[_]||{};if((e=(i[r[g]]||{})[t])||x("Missing ["+t+"] "+h),!e[I]&&!1!==i[P]){for(var o=!k(n,t),f=D(n),s=[];o&&f&&!B(f)&&!A(s,f);){var a=f[t];if(a){o=a===u;break}s.push(f),f=D(f)}try{o&&(n[t]=e),e[I]=1}catch(c){i[P]=!1}}}return e}(this,u,r,e)||(typeof(t=(t=r[n=u])===e?D(r)[n]:t)!==h&&x("["+n+"] is not a "+h),t)).apply(this,arguments)})[d]=1,e)))}))}return M[w]={setInstFuncs:!0,useBaseInst:!0},M});
+define(function(){"use strict";var e="constructor",v="prototype",h="function",_="_dynInstFuncs",d="_isDynProxy",g="_dynClass",I="_dynInstChk",P=I,w="_dfOpts",r="_unknown_",u="__proto__",i="_dyn"+u,o="_dynInstProto",O="useBaseInst",m="setInstFuncs",f=Object,C=f.getPrototypeOf,s=f.getOwnPropertyNames,F=0;function k(n,t){return n&&f[v].hasOwnProperty.call(n,t)}function b(n){return n&&(n===f[v]||n===Array[v])}function B(n){return b(n)||n===Function[v]}function D(n){if(n){if(C)return C(n);var t=n[u]||n[v]||(n[e]?n[e][v]:null),r=n[i]||t;k(n,i)||(delete n[o],r=n[i]=n[o]||n[i],n[o]=t)}return r}function $(n,t){var r=[];if(s)r=s(n);else for(var e in n)"string"==typeof e&&k(n,e)&&r.push(e);if(r&&0<r.length)for(var u=0;u<r.length;u++)t(r[u])}function j(n,t,r){return t!==e&&typeof n[t]===h&&(r||k(n,t))}function x(n){throw new TypeError("DynamicProto: "+n)}function A(n,t){for(var r=n.length-1;0<=r;r--)if(n[r]===t)return 1}function E(n,t){return k(n,v)?n.name||t||r:((n||{})[e]||{}).name||t||r}function M(n,e,t,r){k(n,v)||x("theClass is an invalid class definition.");var u,i,o,f,s,a,c=n[v],l=(function(n){if(!C)return 1;for(var t=[],r=D(e);r&&!B(r)&&!A(t,r);){if(r===n)return 1;t.push(r),r=D(r)}}(c)||x("["+E(n)+"] is not in class hierarchy of ["+E(e)+"]"),null),n=(k(c,g)?l=c[g]:(l="_dynCls$"+E(n,"_")+"$"+F,F++,c[g]=l),M[w]),y=!!n[O],p=(y&&r&&r[O]!==undefined&&(y=!!r[O]),i={},$(u=e,function(n){!i[n]&&j(u,n,!1)&&(i[n]=u[n])}),i),y=(t(e,function(n,t,r,i){function e(n,t,r){var e,u=t[r];return u[d]&&i&&!1!==(e=n[_]||{})[P]&&(u=(e[t[g]]||{})[r]||u),function(){return u.apply(n,arguments)}}for(var u={},o=($(r,function(n){u[n]=e(t,r,n)}),D(n)),f=[];o&&!B(o)&&!A(f,o);)$(o,function(n){!u[n]&&j(o,n,!C)&&(u[n]=e(t,o,n))}),f.push(o),o=D(o);return u}(c,e,p,y)),!!C&&!!n[m]);o=c,t=l,f=e,s=p,n=!1!==(y=y&&r?!!r[m]:y),b(o)||(c=f[_]=f[_]||{},a=c[t]=c[t]||{},!1!==c[P]&&(c[P]=!!n),$(f,function(n){var r,e,u;j(f,n,!1)&&f[n]!==s[n]&&(a[n]=f[n],delete f[n],k(o,n)&&(!o[n]||o[n][d])||(o[n]=(r=o,e=n,(u=function(){var n,t;return(function(n,t,r,e){var u=null;if(n&&k(r,g)){var i=n[_]||{};if((u=(i[r[g]]||{})[t])||x("Missing ["+t+"] "+h),!u[I]&&!1!==i[P]){for(var o=!k(n,t),f=D(n),s=[];o&&f&&!B(f)&&!A(s,f);){var a=f[t];if(a){o=a===e;break}s.push(f),f=D(f)}try{o&&(n[t]=u),u[I]=1}catch(c){i[P]=!1}}}return u}(this,e,r,u)||(typeof(t=(t=r[n=e])===u?D(r)[n]:t)!==h&&x("["+n+"] is not a "+h),t)).apply(this,arguments)})[d]=1,u)))}))}return M[w]={setInstFuncs:!0,useBaseInst:!0},M});
 //# sourceMappingURL=dynamicproto-js.min.js.map

lib/dist/cjs/dynamicproto-js.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
@@ -57,6 +57,2 @@ */
 /**
- * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
- */
-var DynProtoPolyProto = "_dynProto";
-/**
  * Value used as the name of a class when it cannot be determined
@@ -72,2 +68,10 @@ * @ignore
 /**
+ * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
+ */
+var DynProtoBaseProto = "_dyn" + str__Proto;
+/**
+ * Track the current prototype for IE8 as you can't look back to get the prototype
+ */
+var DynProtoCurrent = "_dynInstProto";
+/**
  * Constant string defined to support minimization
@@ -89,2 +93,6 @@ * @ignore
 /**
+ * Pre-lookup to check for the existence of this function
+ */
+var _objGetOwnProps = Obj["getOwnPropertyNames"];
+/**
  * Internal Global used to generate a unique dynamic class name, every new class will increase this value
@@ -120,18 +128,20 @@ * @ignore
 function _getObjProto(target) {
+    var newProto;
     if (target) {
-        // This method doesn't existing in older browsers (e.g. IE8)
+        // This method doesn't exist in older browsers (e.g. IE8)
         if (_objGetPrototypeOf) {
             return _objGetPrototypeOf(target);
         }
-        // target[Constructor] May break if the constructor has been changed or removed
-        var newProto = target[DynProtoPolyProto] || target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
-        if (newProto) {
-            // Set the _dynProto so the hierarchy can lookup base classes correctly on IE8
-            if (!target[DynProtoPolyProto]) {
-                target[DynProtoPolyProto] = newProto;
-            }
-            return newProto;
+        var curProto = target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
+        // Using the pre-calculated value as IE8 doesn't support looking up the prototype of a prototype and thus fails for more than 1 base class
+        newProto = target[DynProtoBaseProto] || curProto;
+        if (!_hasOwnProperty(target, DynProtoBaseProto)) {
+            // As this prototype doesn't have this property then this is from an inherited class so newProto is the base to return so save it
+            // so we can look it up value (which for a multiple hierarchy dynamicProto will be the base class)
+            delete target[DynProtoCurrent]; // Delete any current value allocated to this instance so we pick up the value from prototype hierarchy
+            newProto = target[DynProtoBaseProto] = target[DynProtoCurrent] || target[DynProtoBaseProto];
+            target[DynProtoCurrent] = curProto;
         }
     }
-    return null;
+    return newProto;
 }
@@ -145,5 +155,4 @@ /**
     var props = [];
-    var getOwnProps = Obj["getOwnPropertyNames"];
-    if (getOwnProps) {
-        props = getOwnProps(target);
+    if (_objGetOwnProps) {
+        props = _objGetOwnProps(target);
     }
@@ -150,0 +159,0 @@ else {

lib/dist/cjs/dynamicproto-js.min.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
  */
-"use strict";var u="constructor",v="prototype",h="function",_="_dynInstFuncs",d="_isDynProxy",g="_dynClass",I="_dynInstChk",P=I,m="_dfOpts",r="_dynProto",o="_unknown_",e="__proto__",w="useBaseInst",O="setInstFuncs",i=Object,C=i.getPrototypeOf,F=0;function k(n,t){return n&&i[v].hasOwnProperty.call(n,t)}function b(n){return n&&(n===i[v]||n===Array[v])}function x(n){return b(n)||n===Function[v]}function B(n){if(n){if(C)return C(n);var t=n[r]||n[e]||n[v]||(n[u]?n[u][v]:null);if(t)return n[r]||(n[r]=t),t}return null}function D(n,t){var r=[],u=i.getOwnPropertyNames;if(u)r=u(n);else for(var o in n)"string"==typeof o&&k(n,o)&&r.push(o);if(r&&0<r.length)for(var e=0;e<r.length;e++)t(r[e])}function $(n,t,r){return t!==u&&typeof n[t]===h&&(r||k(n,t))}function j(n){throw new TypeError("DynamicProto: "+n)}function A(n,t){for(var r=n.length-1;0<=r;r--)if(n[r]===t)return 1}function E(n,t){return k(n,v)?n.name||t||o:((n||{})[u]||{}).name||t||o}function M(n,u,t,r){k(n,v)||j("theClass is an invalid class definition.");var o,e,i,f,s,a,c=n[v],l=(function(n){if(!C)return 1;for(var t=[],r=B(u);r&&!x(r)&&!A(t,r);){if(r===n)return 1;t.push(r),r=B(r)}}(c)||j("["+E(n)+"] is not in class hierarchy of ["+E(u)+"]"),null),n=(k(c,g)?l=c[g]:(l="_dynCls$"+E(n,"_")+"$"+F,F++,c[g]=l),M[m]),y=!!n[w],p=(y&&r&&r[w]!==undefined&&(y=!!r[w]),e={},D(o=u,function(n){!e[n]&&$(o,n,!1)&&(e[n]=o[n])}),e),y=(t(u,function(n,t,r,e){function u(n,t,r){var u,o=t[r];return o[d]&&e&&!1!==(u=n[_]||{})[P]&&(o=(u[t[g]]||{})[r]||o),function(){return o.apply(n,arguments)}}for(var o={},i=(D(r,function(n){o[n]=u(t,r,n)}),B(n)),f=[];i&&!x(i)&&!A(f,i);)D(i,function(n){!o[n]&&$(i,n,!C)&&(o[n]=u(t,i,n))}),f.push(i),i=B(i);return o}(c,u,p,y)),!!C&&!!n[O]);i=c,t=l,f=u,s=p,n=!1!==(y=y&&r?!!r[O]:y),b(i)||(c=f[_]=f[_]||{},a=c[t]=c[t]||{},!1!==c[P]&&(c[P]=!!n),D(f,function(n){var r,u,o;$(f,n,!1)&&f[n]!==s[n]&&(a[n]=f[n],delete f[n],k(i,n)&&(!i[n]||i[n][d])||(i[n]=(r=i,u=n,(o=function(){var n,t;return(function(n,t,r,u){var o=null;if(n&&k(r,g)){var e=n[_]||{};if((o=(e[r[g]]||{})[t])||j("Missing ["+t+"] "+h),!o[I]&&!1!==e[P]){for(var i=!k(n,t),f=B(n),s=[];i&&f&&!x(f)&&!A(s,f);){var a=f[t];if(a){i=a===u;break}s.push(f),f=B(f)}try{i&&(n[t]=o),o[I]=1}catch(c){e[P]=!1}}}return o}(this,u,r,o)||(typeof(t=(t=r[n=u])===o?B(r)[n]:t)!==h&&j("["+n+"] is not a "+h),t)).apply(this,arguments)})[d]=1,o)))}))}M[m]={setInstFuncs:!0,useBaseInst:!0},module.exports=M;
+"use strict";var e="constructor",v="prototype",h="function",_="_dynInstFuncs",d="_isDynProxy",g="_dynClass",I="_dynInstChk",P=I,m="_dfOpts",r="_unknown_",o="__proto__",u="_dyn"+o,i="_dynInstProto",w="useBaseInst",O="setInstFuncs",s=Object,C=s.getPrototypeOf,f=s.getOwnPropertyNames,F=0;function k(n,t){return n&&s[v].hasOwnProperty.call(n,t)}function b(n){return n&&(n===s[v]||n===Array[v])}function x(n){return b(n)||n===Function[v]}function B(n){if(n){if(C)return C(n);var t=n[o]||n[v]||(n[e]?n[e][v]:null),r=n[u]||t;k(n,u)||(delete n[i],r=n[u]=n[i]||n[u],n[i]=t)}return r}function D(n,t){var r=[];if(f)r=f(n);else for(var e in n)"string"==typeof e&&k(n,e)&&r.push(e);if(r&&0<r.length)for(var o=0;o<r.length;o++)t(r[o])}function $(n,t,r){return t!==e&&typeof n[t]===h&&(r||k(n,t))}function j(n){throw new TypeError("DynamicProto: "+n)}function A(n,t){for(var r=n.length-1;0<=r;r--)if(n[r]===t)return 1}function E(n,t){return k(n,v)?n.name||t||r:((n||{})[e]||{}).name||t||r}function M(n,e,t,r){k(n,v)||j("theClass is an invalid class definition.");var o,u,i,s,f,a,c=n[v],l=(function(n){if(!C)return 1;for(var t=[],r=B(e);r&&!x(r)&&!A(t,r);){if(r===n)return 1;t.push(r),r=B(r)}}(c)||j("["+E(n)+"] is not in class hierarchy of ["+E(e)+"]"),null),n=(k(c,g)?l=c[g]:(l="_dynCls$"+E(n,"_")+"$"+F,F++,c[g]=l),M[m]),y=!!n[w],p=(y&&r&&r[w]!==undefined&&(y=!!r[w]),u={},D(o=e,function(n){!u[n]&&$(o,n,!1)&&(u[n]=o[n])}),u),y=(t(e,function(n,t,r,u){function e(n,t,r){var e,o=t[r];return o[d]&&u&&!1!==(e=n[_]||{})[P]&&(o=(e[t[g]]||{})[r]||o),function(){return o.apply(n,arguments)}}for(var o={},i=(D(r,function(n){o[n]=e(t,r,n)}),B(n)),s=[];i&&!x(i)&&!A(s,i);)D(i,function(n){!o[n]&&$(i,n,!C)&&(o[n]=e(t,i,n))}),s.push(i),i=B(i);return o}(c,e,p,y)),!!C&&!!n[O]);i=c,t=l,s=e,f=p,n=!1!==(y=y&&r?!!r[O]:y),b(i)||(c=s[_]=s[_]||{},a=c[t]=c[t]||{},!1!==c[P]&&(c[P]=!!n),D(s,function(n){var r,e,o;$(s,n,!1)&&s[n]!==f[n]&&(a[n]=s[n],delete s[n],k(i,n)&&(!i[n]||i[n][d])||(i[n]=(r=i,e=n,(o=function(){var n,t;return(function(n,t,r,e){var o=null;if(n&&k(r,g)){var u=n[_]||{};if((o=(u[r[g]]||{})[t])||j("Missing ["+t+"] "+h),!o[I]&&!1!==u[P]){for(var i=!k(n,t),s=B(n),f=[];i&&s&&!x(s)&&!A(f,s);){var a=s[t];if(a){i=a===e;break}f.push(s),s=B(s)}try{i&&(n[t]=o),o[I]=1}catch(c){u[P]=!1}}}return o}(this,e,r,o)||(typeof(t=(t=r[n=e])===o?B(r)[n]:t)!==h&&j("["+n+"] is not a "+h),t)).apply(this,arguments)})[d]=1,o)))}))}M[m]={setInstFuncs:!0,useBaseInst:!0},module.exports=M;
 //# sourceMappingURL=dynamicproto-js.min.js.map

lib/dist/esm/dynamicproto-js.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
@@ -55,6 +55,2 @@ */
 /**
- * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
- */
-var DynProtoPolyProto = "_dynProto";
-/**
  * Value used as the name of a class when it cannot be determined
@@ -70,2 +66,10 @@ * @ignore
 /**
+ * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
+ */
+var DynProtoBaseProto = "_dyn" + str__Proto;
+/**
+ * Track the current prototype for IE8 as you can't look back to get the prototype
+ */
+var DynProtoCurrent = "_dynInstProto";
+/**
  * Constant string defined to support minimization
@@ -87,2 +91,6 @@ * @ignore
 /**
+ * Pre-lookup to check for the existence of this function
+ */
+var _objGetOwnProps = Obj["getOwnPropertyNames"];
+/**
  * Internal Global used to generate a unique dynamic class name, every new class will increase this value
@@ -118,18 +126,20 @@ * @ignore
 function _getObjProto(target) {
+    var newProto;
     if (target) {
-        // This method doesn't existing in older browsers (e.g. IE8)
+        // This method doesn't exist in older browsers (e.g. IE8)
         if (_objGetPrototypeOf) {
             return _objGetPrototypeOf(target);
         }
-        // target[Constructor] May break if the constructor has been changed or removed
-        var newProto = target[DynProtoPolyProto] || target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
-        if (newProto) {
-            // Set the _dynProto so the hierarchy can lookup base classes correctly on IE8
-            if (!target[DynProtoPolyProto]) {
-                target[DynProtoPolyProto] = newProto;
-            }
-            return newProto;
+        var curProto = target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
+        // Using the pre-calculated value as IE8 doesn't support looking up the prototype of a prototype and thus fails for more than 1 base class
+        newProto = target[DynProtoBaseProto] || curProto;
+        if (!_hasOwnProperty(target, DynProtoBaseProto)) {
+            // As this prototype doesn't have this property then this is from an inherited class so newProto is the base to return so save it
+            // so we can look it up value (which for a multiple hierarchy dynamicProto will be the base class)
+            delete target[DynProtoCurrent]; // Delete any current value allocated to this instance so we pick up the value from prototype hierarchy
+            newProto = target[DynProtoBaseProto] = target[DynProtoCurrent] || target[DynProtoBaseProto];
+            target[DynProtoCurrent] = curProto;
         }
     }
-    return null;
+    return newProto;
 }
@@ -143,5 +153,4 @@ /**
     var props = [];
-    var getOwnProps = Obj["getOwnPropertyNames"];
-    if (getOwnProps) {
-        props = getOwnProps(target);
+    if (_objGetOwnProps) {
+        props = _objGetOwnProps(target);
     }
@@ -148,0 +157,0 @@ else {

lib/dist/esm/dynamicproto-js.min.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
@@ -55,6 +55,2 @@ */
 /**
- * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
- */
-var DynProtoPolyProto = "_dynProto";
-/**
  * Value used as the name of a class when it cannot be determined
@@ -70,2 +66,10 @@ * @ignore
 /**
+ * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
+ */
+var DynProtoBaseProto = "_dyn" + str__Proto;
+/**
+ * Track the current prototype for IE8 as you can't look back to get the prototype
+ */
+var DynProtoCurrent = "_dynInstProto";
+/**
  * Constant string defined to support minimization
@@ -87,2 +91,6 @@ * @ignore
 /**
+ * Pre-lookup to check for the existence of this function
+ */
+var _objGetOwnProps = Obj["getOwnPropertyNames"];
+/**
  * Internal Global used to generate a unique dynamic class name, every new class will increase this value
@@ -118,18 +126,20 @@ * @ignore
 function _getObjProto(target) {
+    var newProto;
     if (target) {
-        // This method doesn't existing in older browsers (e.g. IE8)
+        // This method doesn't exist in older browsers (e.g. IE8)
         if (_objGetPrototypeOf) {
             return _objGetPrototypeOf(target);
         }
-        // target[Constructor] May break if the constructor has been changed or removed
-        var newProto = target[DynProtoPolyProto] || target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
-        if (newProto) {
-            // Set the _dynProto so the hierarchy can lookup base classes correctly on IE8
-            if (!target[DynProtoPolyProto]) {
-                target[DynProtoPolyProto] = newProto;
-            }
-            return newProto;
+        var curProto = target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
+        // Using the pre-calculated value as IE8 doesn't support looking up the prototype of a prototype and thus fails for more than 1 base class
+        newProto = target[DynProtoBaseProto] || curProto;
+        if (!_hasOwnProperty(target, DynProtoBaseProto)) {
+            // As this prototype doesn't have this property then this is from an inherited class so newProto is the base to return so save it
+            // so we can look it up value (which for a multiple hierarchy dynamicProto will be the base class)
+            delete target[DynProtoCurrent]; // Delete any current value allocated to this instance so we pick up the value from prototype hierarchy
+            newProto = target[DynProtoBaseProto] = target[DynProtoCurrent] || target[DynProtoBaseProto];
+            target[DynProtoCurrent] = curProto;
         }
     }
-    return null;
+    return newProto;
 }
@@ -143,5 +153,4 @@ /**
     var props = [];
-    var getOwnProps = Obj["getOwnPropertyNames"];
-    if (getOwnProps) {
-        props = getOwnProps(target);
+    if (_objGetOwnProps) {
+        props = _objGetOwnProps(target);
     }
@@ -148,0 +157,0 @@ else {

lib/dist/iife/dynamicproto-js.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
@@ -59,6 +59,2 @@ */
     /**
-     * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
-     */
-    var DynProtoPolyProto = "_dynProto";
-    /**
      * Value used as the name of a class when it cannot be determined
@@ -74,2 +70,10 @@ * @ignore
     /**
+     * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
+     */
+    var DynProtoBaseProto = "_dyn" + str__Proto;
+    /**
+     * Track the current prototype for IE8 as you can't look back to get the prototype
+     */
+    var DynProtoCurrent = "_dynInstProto";
+    /**
      * Constant string defined to support minimization
@@ -91,2 +95,6 @@ * @ignore
     /**
+     * Pre-lookup to check for the existence of this function
+     */
+    var _objGetOwnProps = Obj["getOwnPropertyNames"];
+    /**
      * Internal Global used to generate a unique dynamic class name, every new class will increase this value
@@ -122,18 +130,20 @@ * @ignore
     function _getObjProto(target) {
+        var newProto;
         if (target) {
-            // This method doesn't existing in older browsers (e.g. IE8)
+            // This method doesn't exist in older browsers (e.g. IE8)
             if (_objGetPrototypeOf) {
                 return _objGetPrototypeOf(target);
             }
-            // target[Constructor] May break if the constructor has been changed or removed
-            var newProto = target[DynProtoPolyProto] || target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
-            if (newProto) {
-                // Set the _dynProto so the hierarchy can lookup base classes correctly on IE8
-                if (!target[DynProtoPolyProto]) {
-                    target[DynProtoPolyProto] = newProto;
-                }
-                return newProto;
+            var curProto = target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
+            // Using the pre-calculated value as IE8 doesn't support looking up the prototype of a prototype and thus fails for more than 1 base class
+            newProto = target[DynProtoBaseProto] || curProto;
+            if (!_hasOwnProperty(target, DynProtoBaseProto)) {
+                // As this prototype doesn't have this property then this is from an inherited class so newProto is the base to return so save it
+                // so we can look it up value (which for a multiple hierarchy dynamicProto will be the base class)
+                delete target[DynProtoCurrent]; // Delete any current value allocated to this instance so we pick up the value from prototype hierarchy
+                newProto = target[DynProtoBaseProto] = target[DynProtoCurrent] || target[DynProtoBaseProto];
+                target[DynProtoCurrent] = curProto;
             }
         }
-        return null;
+        return newProto;
     }
@@ -147,5 +157,4 @@ /**
         var props = [];
-        var getOwnProps = Obj["getOwnPropertyNames"];
-        if (getOwnProps) {
-            props = getOwnProps(target);
+        if (_objGetOwnProps) {
+            props = _objGetOwnProps(target);
         }
@@ -152,0 +161,0 @@ else {

lib/dist/iife/dynamicproto-js.min.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
  */
-this.Microsoft=this.Microsoft||{},this.Microsoft["DynamicProto-JS"]=function(){"use strict";var o="constructor",p="prototype",v="function",_="_dynInstFuncs",d="_isDynProxy",g="_dynClass",P="_dynInstChk",I=P,m="_dfOpts",r="_dynProto",i="_unknown_",u="__proto__",w="useBaseInst",O="setInstFuncs",e=Object,C=e.getPrototypeOf,F=0;function M(n,t){return n&&e[p].hasOwnProperty.call(n,t)}function k(n){return n&&(n===e[p]||n===Array[p])}function D(n){return k(n)||n===Function[p]}function b(n){if(n){if(C)return C(n);var t=n[r]||n[u]||n[p]||(n[o]?n[o][p]:null);if(t)return n[r]||(n[r]=t),t}return null}function B(n,t){var r=[],o=e.getOwnPropertyNames;if(o)r=o(n);else for(var i in n)"string"==typeof i&&M(n,i)&&r.push(i);if(r&&0<r.length)for(var u=0;u<r.length;u++)t(r[u])}function $(n,t,r){return t!==o&&typeof n[t]===v&&(r||M(n,t))}function j(n){throw new TypeError("DynamicProto: "+n)}function x(n,t){for(var r=n.length-1;0<=r;r--)if(n[r]===t)return 1}function A(n,t){return M(n,p)?n.name||t||i:((n||{})[o]||{}).name||t||i}function E(n,o,t,r){M(n,p)||j("theClass is an invalid class definition.");var i,u,e,f,s,c,a=n[p],l=(function(n){if(!C)return 1;for(var t=[],r=b(o);r&&!D(r)&&!x(t,r);){if(r===n)return 1;t.push(r),r=b(r)}}(a)||j("["+A(n)+"] is not in class hierarchy of ["+A(o)+"]"),null),n=(M(a,g)?l=a[g]:(l="_dynCls$"+A(n,"_")+"$"+F,F++,a[g]=l),E[m]),y=!!n[w],h=(y&&r&&r[w]!==undefined&&(y=!!r[w]),u={},B(i=o,function(n){!u[n]&&$(i,n,!1)&&(u[n]=i[n])}),u),y=(t(o,function(n,t,r,u){function o(n,t,r){var o,i=t[r];return i[d]&&u&&!1!==(o=n[_]||{})[I]&&(i=(o[t[g]]||{})[r]||i),function(){return i.apply(n,arguments)}}for(var i={},e=(B(r,function(n){i[n]=o(t,r,n)}),b(n)),f=[];e&&!D(e)&&!x(f,e);)B(e,function(n){!i[n]&&$(e,n,!C)&&(i[n]=o(t,e,n))}),f.push(e),e=b(e);return i}(a,o,h,y)),!!C&&!!n[O]);e=a,t=l,f=o,s=h,n=!1!==(y=y&&r?!!r[O]:y),k(e)||(a=f[_]=f[_]||{},c=a[t]=a[t]||{},!1!==a[I]&&(a[I]=!!n),B(f,function(n){var r,o,i;$(f,n,!1)&&f[n]!==s[n]&&(c[n]=f[n],delete f[n],M(e,n)&&(!e[n]||e[n][d])||(e[n]=(r=e,o=n,(i=function(){var n,t;return(function(n,t,r,o){var i=null;if(n&&M(r,g)){var u=n[_]||{};if((i=(u[r[g]]||{})[t])||j("Missing ["+t+"] "+v),!i[P]&&!1!==u[I]){for(var e=!M(n,t),f=b(n),s=[];e&&f&&!D(f)&&!x(s,f);){var c=f[t];if(c){e=c===o;break}s.push(f),f=b(f)}try{e&&(n[t]=i),i[P]=1}catch(a){u[I]=!1}}}return i}(this,o,r,i)||(typeof(t=(t=r[n=o])===i?b(r)[n]:t)!==v&&j("["+n+"] is not a "+v),t)).apply(this,arguments)})[d]=1,i)))}))}return E[m]={setInstFuncs:!0,useBaseInst:!0},E}();
+this.Microsoft=this.Microsoft||{},this.Microsoft["DynamicProto-JS"]=function(){"use strict";var o="constructor",p="prototype",v="function",_="_dynInstFuncs",d="_isDynProxy",g="_dynClass",I="_dynInstChk",P=I,m="_dfOpts",r="_unknown_",i="__proto__",e="_dyn"+i,u="_dynInstProto",w="useBaseInst",O="setInstFuncs",s=Object,C=s.getPrototypeOf,f=s.getOwnPropertyNames,F=0;function M(n,t){return n&&s[p].hasOwnProperty.call(n,t)}function k(n){return n&&(n===s[p]||n===Array[p])}function D(n){return k(n)||n===Function[p]}function b(n){if(n){if(C)return C(n);var t=n[i]||n[p]||(n[o]?n[o][p]:null),r=n[e]||t;M(n,e)||(delete n[u],r=n[e]=n[u]||n[e],n[u]=t)}return r}function B(n,t){var r=[];if(f)r=f(n);else for(var o in n)"string"==typeof o&&M(n,o)&&r.push(o);if(r&&0<r.length)for(var i=0;i<r.length;i++)t(r[i])}function $(n,t,r){return t!==o&&typeof n[t]===v&&(r||M(n,t))}function j(n){throw new TypeError("DynamicProto: "+n)}function x(n,t){for(var r=n.length-1;0<=r;r--)if(n[r]===t)return 1}function A(n,t){return M(n,p)?n.name||t||r:((n||{})[o]||{}).name||t||r}function E(n,o,t,r){M(n,p)||j("theClass is an invalid class definition.");var i,e,u,s,f,c,a=n[p],y=(function(n){if(!C)return 1;for(var t=[],r=b(o);r&&!D(r)&&!x(t,r);){if(r===n)return 1;t.push(r),r=b(r)}}(a)||j("["+A(n)+"] is not in class hierarchy of ["+A(o)+"]"),null),n=(M(a,g)?y=a[g]:(y="_dynCls$"+A(n,"_")+"$"+F,F++,a[g]=y),E[m]),l=!!n[w],h=(l&&r&&r[w]!==undefined&&(l=!!r[w]),e={},B(i=o,function(n){!e[n]&&$(i,n,!1)&&(e[n]=i[n])}),e),l=(t(o,function(n,t,r,e){function o(n,t,r){var o,i=t[r];return i[d]&&e&&!1!==(o=n[_]||{})[P]&&(i=(o[t[g]]||{})[r]||i),function(){return i.apply(n,arguments)}}for(var i={},u=(B(r,function(n){i[n]=o(t,r,n)}),b(n)),s=[];u&&!D(u)&&!x(s,u);)B(u,function(n){!i[n]&&$(u,n,!C)&&(i[n]=o(t,u,n))}),s.push(u),u=b(u);return i}(a,o,h,l)),!!C&&!!n[O]);u=a,t=y,s=o,f=h,n=!1!==(l=l&&r?!!r[O]:l),k(u)||(a=s[_]=s[_]||{},c=a[t]=a[t]||{},!1!==a[P]&&(a[P]=!!n),B(s,function(n){var r,o,i;$(s,n,!1)&&s[n]!==f[n]&&(c[n]=s[n],delete s[n],M(u,n)&&(!u[n]||u[n][d])||(u[n]=(r=u,o=n,(i=function(){var n,t;return(function(n,t,r,o){var i=null;if(n&&M(r,g)){var e=n[_]||{};if((i=(e[r[g]]||{})[t])||j("Missing ["+t+"] "+v),!i[I]&&!1!==e[P]){for(var u=!M(n,t),s=b(n),f=[];u&&s&&!D(s)&&!x(f,s);){var c=s[t];if(c){u=c===o;break}f.push(s),s=b(s)}try{u&&(n[t]=i),i[I]=1}catch(a){e[P]=!1}}}return i}(this,o,r,i)||(typeof(t=(t=r[n=o])===i?b(r)[n]:t)!==v&&j("["+n+"] is not a "+v),t)).apply(this,arguments)})[d]=1,i)))}))}return E[m]={setInstFuncs:!0,useBaseInst:!0},E}();
 //# sourceMappingURL=dynamicproto-js.min.js.map

lib/dist/node/dynamicproto-js.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
@@ -61,6 +61,2 @@ */
     /**
-     * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
-     */
-    var DynProtoPolyProto = "_dynProto";
-    /**
      * Value used as the name of a class when it cannot be determined
@@ -76,2 +72,10 @@ * @ignore
     /**
+     * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
+     */
+    var DynProtoBaseProto = "_dyn" + str__Proto;
+    /**
+     * Track the current prototype for IE8 as you can't look back to get the prototype
+     */
+    var DynProtoCurrent = "_dynInstProto";
+    /**
      * Constant string defined to support minimization
@@ -93,2 +97,6 @@ * @ignore
     /**
+     * Pre-lookup to check for the existence of this function
+     */
+    var _objGetOwnProps = Obj["getOwnPropertyNames"];
+    /**
      * Internal Global used to generate a unique dynamic class name, every new class will increase this value
@@ -124,18 +132,20 @@ * @ignore
     function _getObjProto(target) {
+        var newProto;
         if (target) {
-            // This method doesn't existing in older browsers (e.g. IE8)
+            // This method doesn't exist in older browsers (e.g. IE8)
             if (_objGetPrototypeOf) {
                 return _objGetPrototypeOf(target);
             }
-            // target[Constructor] May break if the constructor has been changed or removed
-            var newProto = target[DynProtoPolyProto] || target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
-            if (newProto) {
-                // Set the _dynProto so the hierarchy can lookup base classes correctly on IE8
-                if (!target[DynProtoPolyProto]) {
-                    target[DynProtoPolyProto] = newProto;
-                }
-                return newProto;
+            var curProto = target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
+            // Using the pre-calculated value as IE8 doesn't support looking up the prototype of a prototype and thus fails for more than 1 base class
+            newProto = target[DynProtoBaseProto] || curProto;
+            if (!_hasOwnProperty(target, DynProtoBaseProto)) {
+                // As this prototype doesn't have this property then this is from an inherited class so newProto is the base to return so save it
+                // so we can look it up value (which for a multiple hierarchy dynamicProto will be the base class)
+                delete target[DynProtoCurrent]; // Delete any current value allocated to this instance so we pick up the value from prototype hierarchy
+                newProto = target[DynProtoBaseProto] = target[DynProtoCurrent] || target[DynProtoBaseProto];
+                target[DynProtoCurrent] = curProto;
             }
         }
-        return null;
+        return newProto;
     }
@@ -149,5 +159,4 @@ /**
         var props = [];
-        var getOwnProps = Obj["getOwnPropertyNames"];
-        if (getOwnProps) {
-            props = getOwnProps(target);
+        if (_objGetOwnProps) {
+            props = _objGetOwnProps(target);
         }
@@ -154,0 +163,0 @@ else {

lib/dist/node/dynamicproto-js.min.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
  */
-var n=this,t=function(){"use strict";var o="constructor",d="prototype",h="function",v="_dynInstFuncs",_="_isDynProxy",g="_dynClass",m="_dynInstChk",P=m,I="_dfOpts",r="_dynProto",e="_unknown_",i="__proto__",b="useBaseInst",w="setInstFuncs",u=Object,O=u.getPrototypeOf,C=0;function F(n,t){return n&&u[d].hasOwnProperty.call(n,t)}function M(n){return n&&(n===u[d]||n===Array[d])}function k(n){return M(n)||n===Function[d]}function x(n){if(n){if(O)return O(n);var t=n[r]||n[i]||n[d]||(n[o]?n[o][d]:null);if(t)return n[r]||(n[r]=t),t}return null}function D(n,t){var r=[],o=u.getOwnPropertyNames;if(o)r=o(n);else for(var e in n)"string"==typeof e&&F(n,e)&&r.push(e);if(r&&0<r.length)for(var i=0;i<r.length;i++)t(r[i])}function T(n,t,r){return t!==o&&typeof n[t]===h&&(r||F(n,t))}function j(n){throw new TypeError("DynamicProto: "+n)}function B(n,t){for(var r=n.length-1;0<=r;r--)if(n[r]===t)return 1}function $(n,t){return F(n,d)?n.name||t||e:((n||{})[o]||{}).name||t||e}function A(n,o,t,r){F(n,d)||j("theClass is an invalid class definition.");var e,i,u,f,s,c,a=n[d],l=(function(n){if(!O)return 1;for(var t=[],r=x(o);r&&!k(r)&&!B(t,r);){if(r===n)return 1;t.push(r),r=x(r)}}(a)||j("["+$(n)+"] is not in class hierarchy of ["+$(o)+"]"),null),n=(F(a,g)?l=a[g]:(l="_dynCls$"+$(n,"_")+"$"+C,C++,a[g]=l),A[I]),y=!!n[b],p=(y&&r&&r[b]!==undefined&&(y=!!r[b]),i={},D(e=o,function(n){!i[n]&&T(e,n,!1)&&(i[n]=e[n])}),i),y=(t(o,function(n,t,r,i){function o(n,t,r){var o,e=t[r];return e[_]&&i&&!1!==(o=n[v]||{})[P]&&(e=(o[t[g]]||{})[r]||e),function(){return e.apply(n,arguments)}}for(var e={},u=(D(r,function(n){e[n]=o(t,r,n)}),x(n)),f=[];u&&!k(u)&&!B(f,u);)D(u,function(n){!e[n]&&T(u,n,!O)&&(e[n]=o(t,u,n))}),f.push(u),u=x(u);return e}(a,o,p,y)),!!O&&!!n[w]);u=a,t=l,f=o,s=p,n=!1!==(y=y&&r?!!r[w]:y),M(u)||(a=f[v]=f[v]||{},c=a[t]=a[t]||{},!1!==a[P]&&(a[P]=!!n),D(f,function(n){var r,o,e;T(f,n,!1)&&f[n]!==s[n]&&(c[n]=f[n],delete f[n],F(u,n)&&(!u[n]||u[n][_])||(u[n]=(r=u,o=n,(e=function(){var n,t;return(function(n,t,r,o){var e=null;if(n&&F(r,g)){var i=n[v]||{};if((e=(i[r[g]]||{})[t])||j("Missing ["+t+"] "+h),!e[m]&&!1!==i[P]){for(var u=!F(n,t),f=x(n),s=[];u&&f&&!k(f)&&!B(s,f);){var c=f[t];if(c){u=c===o;break}s.push(f),f=x(f)}try{u&&(n[t]=e),e[m]=1}catch(a){i[P]=!1}}}return e}(this,o,r,e)||(typeof(t=(t=r[n=o])===e?x(r)[n]:t)!==h&&j("["+n+"] is not a "+h),t)).apply(this,arguments)})[_]=1,e)))}))}return A[I]={setInstFuncs:!0,useBaseInst:!0},A};"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):((n="undefined"!=typeof globalThis?globalThis:n||self).Microsoft=n.Microsoft||{},n.Microsoft["DynamicProto-JS"]=t());
+var n=this,t=function(){"use strict";var e="constructor",d="prototype",h="function",v="_dynInstFuncs",_="_isDynProxy",g="_dynClass",m="_dynInstChk",I=m,P="_dfOpts",r="_unknown_",o="__proto__",i="_dyn"+o,f="_dynInstProto",b="useBaseInst",w="setInstFuncs",u=Object,O=u.getPrototypeOf,s=u.getOwnPropertyNames,C=0;function F(n,t){return n&&u[d].hasOwnProperty.call(n,t)}function M(n){return n&&(n===u[d]||n===Array[d])}function k(n){return M(n)||n===Function[d]}function x(n){if(n){if(O)return O(n);var t=n[o]||n[d]||(n[e]?n[e][d]:null),r=n[i]||t;F(n,i)||(delete n[f],r=n[i]=n[f]||n[i],n[f]=t)}return r}function D(n,t){var r=[];if(s)r=s(n);else for(var e in n)"string"==typeof e&&F(n,e)&&r.push(e);if(r&&0<r.length)for(var o=0;o<r.length;o++)t(r[o])}function T(n,t,r){return t!==e&&typeof n[t]===h&&(r||F(n,t))}function j(n){throw new TypeError("DynamicProto: "+n)}function B(n,t){for(var r=n.length-1;0<=r;r--)if(n[r]===t)return 1}function $(n,t){return F(n,d)?n.name||t||r:((n||{})[e]||{}).name||t||r}function A(n,e,t,r){F(n,d)||j("theClass is an invalid class definition.");var o,i,f,u,s,c,a=n[d],l=(function(n){if(!O)return 1;for(var t=[],r=x(e);r&&!k(r)&&!B(t,r);){if(r===n)return 1;t.push(r),r=x(r)}}(a)||j("["+$(n)+"] is not in class hierarchy of ["+$(e)+"]"),null),n=(F(a,g)?l=a[g]:(l="_dynCls$"+$(n,"_")+"$"+C,C++,a[g]=l),A[P]),y=!!n[b],p=(y&&r&&r[b]!==undefined&&(y=!!r[b]),i={},D(o=e,function(n){!i[n]&&T(o,n,!1)&&(i[n]=o[n])}),i),y=(t(e,function(n,t,r,i){function e(n,t,r){var e,o=t[r];return o[_]&&i&&!1!==(e=n[v]||{})[I]&&(o=(e[t[g]]||{})[r]||o),function(){return o.apply(n,arguments)}}for(var o={},f=(D(r,function(n){o[n]=e(t,r,n)}),x(n)),u=[];f&&!k(f)&&!B(u,f);)D(f,function(n){!o[n]&&T(f,n,!O)&&(o[n]=e(t,f,n))}),u.push(f),f=x(f);return o}(a,e,p,y)),!!O&&!!n[w]);f=a,t=l,u=e,s=p,n=!1!==(y=y&&r?!!r[w]:y),M(f)||(a=u[v]=u[v]||{},c=a[t]=a[t]||{},!1!==a[I]&&(a[I]=!!n),D(u,function(n){var r,e,o;T(u,n,!1)&&u[n]!==s[n]&&(c[n]=u[n],delete u[n],F(f,n)&&(!f[n]||f[n][_])||(f[n]=(r=f,e=n,(o=function(){var n,t;return(function(n,t,r,e){var o=null;if(n&&F(r,g)){var i=n[v]||{};if((o=(i[r[g]]||{})[t])||j("Missing ["+t+"] "+h),!o[m]&&!1!==i[I]){for(var f=!F(n,t),u=x(n),s=[];f&&u&&!k(u)&&!B(s,u);){var c=u[t];if(c){f=c===e;break}s.push(u),u=x(u)}try{f&&(n[t]=o),o[m]=1}catch(a){i[I]=!1}}}return o}(this,e,r,o)||(typeof(t=(t=r[n=e])===o?x(r)[n]:t)!==h&&j("["+n+"] is not a "+h),t)).apply(this,arguments)})[_]=1,o)))}))}return A[P]={setInstFuncs:!0,useBaseInst:!0},A};"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):((n="undefined"!=typeof globalThis?globalThis:n||self).Microsoft=n.Microsoft||{},n.Microsoft["DynamicProto-JS"]=t());
 //# sourceMappingURL=dynamicproto-js.min.js.map

lib/dist/system/dynamicproto-js.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
@@ -62,6 +62,2 @@ */
             /**
-             * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
-             */
-            var DynProtoPolyProto = "_dynProto";
-            /**
              * Value used as the name of a class when it cannot be determined
@@ -77,2 +73,10 @@ * @ignore
             /**
+             * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
+             */
+            var DynProtoBaseProto = "_dyn" + str__Proto;
+            /**
+             * Track the current prototype for IE8 as you can't look back to get the prototype
+             */
+            var DynProtoCurrent = "_dynInstProto";
+            /**
              * Constant string defined to support minimization
@@ -94,2 +98,6 @@ * @ignore
             /**
+             * Pre-lookup to check for the existence of this function
+             */
+            var _objGetOwnProps = Obj["getOwnPropertyNames"];
+            /**
              * Internal Global used to generate a unique dynamic class name, every new class will increase this value
@@ -125,18 +133,20 @@ * @ignore
             function _getObjProto(target) {
+                var newProto;
                 if (target) {
-                    // This method doesn't existing in older browsers (e.g. IE8)
+                    // This method doesn't exist in older browsers (e.g. IE8)
                     if (_objGetPrototypeOf) {
                         return _objGetPrototypeOf(target);
                     }
-                    // target[Constructor] May break if the constructor has been changed or removed
-                    var newProto = target[DynProtoPolyProto] || target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
-                    if (newProto) {
-                        // Set the _dynProto so the hierarchy can lookup base classes correctly on IE8
-                        if (!target[DynProtoPolyProto]) {
-                            target[DynProtoPolyProto] = newProto;
-                        }
-                        return newProto;
+                    var curProto = target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
+                    // Using the pre-calculated value as IE8 doesn't support looking up the prototype of a prototype and thus fails for more than 1 base class
+                    newProto = target[DynProtoBaseProto] || curProto;
+                    if (!_hasOwnProperty(target, DynProtoBaseProto)) {
+                        // As this prototype doesn't have this property then this is from an inherited class so newProto is the base to return so save it
+                        // so we can look it up value (which for a multiple hierarchy dynamicProto will be the base class)
+                        delete target[DynProtoCurrent]; // Delete any current value allocated to this instance so we pick up the value from prototype hierarchy
+                        newProto = target[DynProtoBaseProto] = target[DynProtoCurrent] || target[DynProtoBaseProto];
+                        target[DynProtoCurrent] = curProto;
                     }
                 }
-                return null;
+                return newProto;
             }
@@ -150,5 +160,4 @@ /**
                 var props = [];
-                var getOwnProps = Obj["getOwnPropertyNames"];
-                if (getOwnProps) {
-                    props = getOwnProps(target);
+                if (_objGetOwnProps) {
+                    props = _objGetOwnProps(target);
                 }
@@ -155,0 +164,0 @@ else {

lib/dist/system/dynamicproto-js.min.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
  */
-System.register("Microsoft.DynamicProto-JS",[],function(n){"use strict";return{execute:function(){n("default",E);var e="constructor",v="prototype",h="function",_="_dynInstFuncs",d="_isDynProxy",g="_dynClass",P="_dynCls$",m="_dynInstChk",I=m,w="_dfOpts",r="_dynProto",u="_unknown_",o="__proto__",O="useBaseInst",C="setInstFuncs",i=Object,F=i.getPrototypeOf,k=0;function D(n,t){return n&&i[v].hasOwnProperty.call(n,t)}function b(n){return n&&(n===i[v]||n===Array[v])}function x(n){return b(n)||n===Function[v]}function B(n){if(n){if(F)return F(n);var t=n[r]||n[o]||n[v]||(n[e]?n[e][v]:null);if(t)return n[r]||(n[r]=t),t}return null}function M(n,t){var r=[],e=i.getOwnPropertyNames;if(e)r=e(n);else for(var u in n)"string"==typeof u&&D(n,u)&&r.push(u);if(r&&0<r.length)for(var o=0;o<r.length;o++)t(r[o])}function S(n,t,r){return t!==e&&typeof n[t]===h&&(r||D(n,t))}function $(n){throw new TypeError("DynamicProto: "+n)}function j(n,t){for(var r=n.length-1;0<=r;r--)if(n[r]===t)return 1}function A(n,t){return D(n,v)?n.name||t||u:((n||{})[e]||{}).name||t||u}function E(n,e,t,r){D(n,v)||$("theClass is an invalid class definition.");var u,o,i,f,s,c,a=n[v],l=(function(n){if(!F)return 1;for(var t=[],r=B(e);r&&!x(r)&&!j(t,r);){if(r===n)return 1;t.push(r),r=B(r)}}(a)||$("["+A(n)+"] is not in class hierarchy of ["+A(e)+"]"),null),n=(D(a,g)?l=a[g]:(l=P+A(n,"_")+"$"+k,k++,a[g]=l),E[w]),y=!!n[O],p=(y&&r&&r[O]!==undefined&&(y=!!r[O]),o={},M(u=e,function(n){!o[n]&&S(u,n,!1)&&(o[n]=u[n])}),o),y=(t(e,function(n,t,r,o){function e(n,t,r){var e,u=t[r];return u[d]&&o&&!1!==(e=n[_]||{})[I]&&(u=(e[t[g]]||{})[r]||u),function(){return u.apply(n,arguments)}}for(var u={},i=(M(r,function(n){u[n]=e(t,r,n)}),B(n)),f=[];i&&!x(i)&&!j(f,i);)M(i,function(n){!u[n]&&S(i,n,!F)&&(u[n]=e(t,i,n))}),f.push(i),i=B(i);return u}(a,e,p,y)),!!F&&!!n[C]);i=a,t=l,f=e,s=p,n=!1!==(y=y&&r?!!r[C]:y),b(i)||(a=f[_]=f[_]||{},c=a[t]=a[t]||{},!1!==a[I]&&(a[I]=!!n),M(f,function(n){var r,e,u;S(f,n,!1)&&f[n]!==s[n]&&(c[n]=f[n],delete f[n],D(i,n)&&(!i[n]||i[n][d])||(i[n]=(r=i,e=n,(u=function(){var n,t;return(function(n,t,r,e){var u=null;if(n&&D(r,g)){var o=n[_]||{};if((u=(o[r[g]]||{})[t])||$("Missing ["+t+"] "+h),!u[m]&&!1!==o[I]){for(var i=!D(n,t),f=B(n),s=[];i&&f&&!x(f)&&!j(s,f);){var c=f[t];if(c){i=c===e;break}s.push(f),f=B(f)}try{i&&(n[t]=u),u[m]=1}catch(a){o[I]=!1}}}return u}(this,e,r,u)||(typeof(t=(t=r[n=e])===u?B(r)[n]:t)!==h&&$("["+n+"] is not a "+h),t)).apply(this,arguments)})[d]=1,u)))}))}E[w]={setInstFuncs:!0,useBaseInst:!0}}}});
+System.register("Microsoft.DynamicProto-JS",[],function(n){"use strict";return{execute:function(){n("default",E);var e="constructor",v="prototype",h="function",_="_dynInstFuncs",d="_isDynProxy",g="_dynClass",I="_dynCls$",P="_dynInstChk",m=P,w="_dfOpts",r="_unknown_",o="__proto__",u="_dyn"+o,i="_dynInstProto",O="useBaseInst",C="setInstFuncs",f=Object,F=f.getPrototypeOf,s=f.getOwnPropertyNames,k=0;function D(n,t){return n&&f[v].hasOwnProperty.call(n,t)}function b(n){return n&&(n===f[v]||n===Array[v])}function x(n){return b(n)||n===Function[v]}function B(n){if(n){if(F)return F(n);var t=n[o]||n[v]||(n[e]?n[e][v]:null),r=n[u]||t;D(n,u)||(delete n[i],r=n[u]=n[i]||n[u],n[i]=t)}return r}function M(n,t){var r=[];if(s)r=s(n);else for(var e in n)"string"==typeof e&&D(n,e)&&r.push(e);if(r&&0<r.length)for(var o=0;o<r.length;o++)t(r[o])}function S(n,t,r){return t!==e&&typeof n[t]===h&&(r||D(n,t))}function $(n){throw new TypeError("DynamicProto: "+n)}function j(n,t){for(var r=n.length-1;0<=r;r--)if(n[r]===t)return 1}function A(n,t){return D(n,v)?n.name||t||r:((n||{})[e]||{}).name||t||r}function E(n,e,t,r){D(n,v)||$("theClass is an invalid class definition.");var o,u,i,f,s,c,a=n[v],y=(function(n){if(!F)return 1;for(var t=[],r=B(e);r&&!x(r)&&!j(t,r);){if(r===n)return 1;t.push(r),r=B(r)}}(a)||$("["+A(n)+"] is not in class hierarchy of ["+A(e)+"]"),null),n=(D(a,g)?y=a[g]:(y=I+A(n,"_")+"$"+k,k++,a[g]=y),E[w]),l=!!n[O],p=(l&&r&&r[O]!==undefined&&(l=!!r[O]),u={},M(o=e,function(n){!u[n]&&S(o,n,!1)&&(u[n]=o[n])}),u),l=(t(e,function(n,t,r,u){function e(n,t,r){var e,o=t[r];return o[d]&&u&&!1!==(e=n[_]||{})[m]&&(o=(e[t[g]]||{})[r]||o),function(){return o.apply(n,arguments)}}for(var o={},i=(M(r,function(n){o[n]=e(t,r,n)}),B(n)),f=[];i&&!x(i)&&!j(f,i);)M(i,function(n){!o[n]&&S(i,n,!F)&&(o[n]=e(t,i,n))}),f.push(i),i=B(i);return o}(a,e,p,l)),!!F&&!!n[C]);i=a,t=y,f=e,s=p,n=!1!==(l=l&&r?!!r[C]:l),b(i)||(a=f[_]=f[_]||{},c=a[t]=a[t]||{},!1!==a[m]&&(a[m]=!!n),M(f,function(n){var r,e,o;S(f,n,!1)&&f[n]!==s[n]&&(c[n]=f[n],delete f[n],D(i,n)&&(!i[n]||i[n][d])||(i[n]=(r=i,e=n,(o=function(){var n,t;return(function(n,t,r,e){var o=null;if(n&&D(r,g)){var u=n[_]||{};if((o=(u[r[g]]||{})[t])||$("Missing ["+t+"] "+h),!o[P]&&!1!==u[m]){for(var i=!D(n,t),f=B(n),s=[];i&&f&&!x(f)&&!j(s,f);){var c=f[t];if(c){i=c===e;break}s.push(f),f=B(f)}try{i&&(n[t]=o),o[P]=1}catch(a){u[m]=!1}}}return o}(this,e,r,o)||(typeof(t=(t=r[n=e])===o?B(r)[n]:t)!==h&&$("["+n+"] is not a "+h),t)).apply(this,arguments)})[d]=1,o)))}))}E[w]={setInstFuncs:!0,useBaseInst:!0}}}});
 //# sourceMappingURL=dynamicproto-js.min.js.map

lib/dist/umd/dynamicproto-js.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
@@ -61,6 +61,2 @@ */
     /**
-     * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
-     */
-    var DynProtoPolyProto = "_dynProto";
-    /**
      * Value used as the name of a class when it cannot be determined
@@ -76,2 +72,10 @@ * @ignore
     /**
+     * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
+     */
+    var DynProtoBaseProto = "_dyn" + str__Proto;
+    /**
+     * Track the current prototype for IE8 as you can't look back to get the prototype
+     */
+    var DynProtoCurrent = "_dynInstProto";
+    /**
      * Constant string defined to support minimization
@@ -93,2 +97,6 @@ * @ignore
     /**
+     * Pre-lookup to check for the existence of this function
+     */
+    var _objGetOwnProps = Obj["getOwnPropertyNames"];
+    /**
      * Internal Global used to generate a unique dynamic class name, every new class will increase this value
@@ -124,18 +132,20 @@ * @ignore
     function _getObjProto(target) {
+        var newProto;
         if (target) {
-            // This method doesn't existing in older browsers (e.g. IE8)
+            // This method doesn't exist in older browsers (e.g. IE8)
             if (_objGetPrototypeOf) {
                 return _objGetPrototypeOf(target);
             }
-            // target[Constructor] May break if the constructor has been changed or removed
-            var newProto = target[DynProtoPolyProto] || target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
-            if (newProto) {
-                // Set the _dynProto so the hierarchy can lookup base classes correctly on IE8
-                if (!target[DynProtoPolyProto]) {
-                    target[DynProtoPolyProto] = newProto;
-                }
-                return newProto;
+            var curProto = target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
+            // Using the pre-calculated value as IE8 doesn't support looking up the prototype of a prototype and thus fails for more than 1 base class
+            newProto = target[DynProtoBaseProto] || curProto;
+            if (!_hasOwnProperty(target, DynProtoBaseProto)) {
+                // As this prototype doesn't have this property then this is from an inherited class so newProto is the base to return so save it
+                // so we can look it up value (which for a multiple hierarchy dynamicProto will be the base class)
+                delete target[DynProtoCurrent]; // Delete any current value allocated to this instance so we pick up the value from prototype hierarchy
+                newProto = target[DynProtoBaseProto] = target[DynProtoCurrent] || target[DynProtoBaseProto];
+                target[DynProtoCurrent] = curProto;
             }
         }
-        return null;
+        return newProto;
     }
@@ -149,5 +159,4 @@ /**
         var props = [];
-        var getOwnProps = Obj["getOwnPropertyNames"];
-        if (getOwnProps) {
-            props = getOwnProps(target);
+        if (_objGetOwnProps) {
+            props = _objGetOwnProps(target);
         }
@@ -154,0 +163,0 @@ else {

lib/dist/umd/dynamicproto-js.min.js

 /*!
- * Microsoft Dynamic Proto Utility, 1.1.5
+ * Microsoft Dynamic Proto Utility, 1.1.6
  * Copyright (c) Microsoft and contributors. All rights reserved.
  */
-var n=this,t=function(){"use strict";var o="constructor",d="prototype",h="function",v="_dynInstFuncs",_="_isDynProxy",g="_dynClass",m="_dynInstChk",P=m,I="_dfOpts",r="_dynProto",e="_unknown_",i="__proto__",b="useBaseInst",w="setInstFuncs",u=Object,O=u.getPrototypeOf,C=0;function F(n,t){return n&&u[d].hasOwnProperty.call(n,t)}function M(n){return n&&(n===u[d]||n===Array[d])}function k(n){return M(n)||n===Function[d]}function x(n){if(n){if(O)return O(n);var t=n[r]||n[i]||n[d]||(n[o]?n[o][d]:null);if(t)return n[r]||(n[r]=t),t}return null}function D(n,t){var r=[],o=u.getOwnPropertyNames;if(o)r=o(n);else for(var e in n)"string"==typeof e&&F(n,e)&&r.push(e);if(r&&0<r.length)for(var i=0;i<r.length;i++)t(r[i])}function T(n,t,r){return t!==o&&typeof n[t]===h&&(r||F(n,t))}function j(n){throw new TypeError("DynamicProto: "+n)}function B(n,t){for(var r=n.length-1;0<=r;r--)if(n[r]===t)return 1}function $(n,t){return F(n,d)?n.name||t||e:((n||{})[o]||{}).name||t||e}function A(n,o,t,r){F(n,d)||j("theClass is an invalid class definition.");var e,i,u,f,s,c,a=n[d],l=(function(n){if(!O)return 1;for(var t=[],r=x(o);r&&!k(r)&&!B(t,r);){if(r===n)return 1;t.push(r),r=x(r)}}(a)||j("["+$(n)+"] is not in class hierarchy of ["+$(o)+"]"),null),n=(F(a,g)?l=a[g]:(l="_dynCls$"+$(n,"_")+"$"+C,C++,a[g]=l),A[I]),y=!!n[b],p=(y&&r&&r[b]!==undefined&&(y=!!r[b]),i={},D(e=o,function(n){!i[n]&&T(e,n,!1)&&(i[n]=e[n])}),i),y=(t(o,function(n,t,r,i){function o(n,t,r){var o,e=t[r];return e[_]&&i&&!1!==(o=n[v]||{})[P]&&(e=(o[t[g]]||{})[r]||e),function(){return e.apply(n,arguments)}}for(var e={},u=(D(r,function(n){e[n]=o(t,r,n)}),x(n)),f=[];u&&!k(u)&&!B(f,u);)D(u,function(n){!e[n]&&T(u,n,!O)&&(e[n]=o(t,u,n))}),f.push(u),u=x(u);return e}(a,o,p,y)),!!O&&!!n[w]);u=a,t=l,f=o,s=p,n=!1!==(y=y&&r?!!r[w]:y),M(u)||(a=f[v]=f[v]||{},c=a[t]=a[t]||{},!1!==a[P]&&(a[P]=!!n),D(f,function(n){var r,o,e;T(f,n,!1)&&f[n]!==s[n]&&(c[n]=f[n],delete f[n],F(u,n)&&(!u[n]||u[n][_])||(u[n]=(r=u,o=n,(e=function(){var n,t;return(function(n,t,r,o){var e=null;if(n&&F(r,g)){var i=n[v]||{};if((e=(i[r[g]]||{})[t])||j("Missing ["+t+"] "+h),!e[m]&&!1!==i[P]){for(var u=!F(n,t),f=x(n),s=[];u&&f&&!k(f)&&!B(s,f);){var c=f[t];if(c){u=c===o;break}s.push(f),f=x(f)}try{u&&(n[t]=e),e[m]=1}catch(a){i[P]=!1}}}return e}(this,o,r,e)||(typeof(t=(t=r[n=o])===e?x(r)[n]:t)!==h&&j("["+n+"] is not a "+h),t)).apply(this,arguments)})[_]=1,e)))}))}return A[I]={setInstFuncs:!0,useBaseInst:!0},A};"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):((n="undefined"!=typeof globalThis?globalThis:n||self).Microsoft=n.Microsoft||{},n.Microsoft["DynamicProto-JS"]=t());
+var n=this,t=function(){"use strict";var e="constructor",d="prototype",h="function",v="_dynInstFuncs",_="_isDynProxy",g="_dynClass",m="_dynInstChk",I=m,P="_dfOpts",r="_unknown_",o="__proto__",i="_dyn"+o,f="_dynInstProto",b="useBaseInst",w="setInstFuncs",u=Object,O=u.getPrototypeOf,s=u.getOwnPropertyNames,C=0;function F(n,t){return n&&u[d].hasOwnProperty.call(n,t)}function M(n){return n&&(n===u[d]||n===Array[d])}function k(n){return M(n)||n===Function[d]}function x(n){if(n){if(O)return O(n);var t=n[o]||n[d]||(n[e]?n[e][d]:null),r=n[i]||t;F(n,i)||(delete n[f],r=n[i]=n[f]||n[i],n[f]=t)}return r}function D(n,t){var r=[];if(s)r=s(n);else for(var e in n)"string"==typeof e&&F(n,e)&&r.push(e);if(r&&0<r.length)for(var o=0;o<r.length;o++)t(r[o])}function T(n,t,r){return t!==e&&typeof n[t]===h&&(r||F(n,t))}function j(n){throw new TypeError("DynamicProto: "+n)}function B(n,t){for(var r=n.length-1;0<=r;r--)if(n[r]===t)return 1}function $(n,t){return F(n,d)?n.name||t||r:((n||{})[e]||{}).name||t||r}function A(n,e,t,r){F(n,d)||j("theClass is an invalid class definition.");var o,i,f,u,s,c,a=n[d],l=(function(n){if(!O)return 1;for(var t=[],r=x(e);r&&!k(r)&&!B(t,r);){if(r===n)return 1;t.push(r),r=x(r)}}(a)||j("["+$(n)+"] is not in class hierarchy of ["+$(e)+"]"),null),n=(F(a,g)?l=a[g]:(l="_dynCls$"+$(n,"_")+"$"+C,C++,a[g]=l),A[P]),y=!!n[b],p=(y&&r&&r[b]!==undefined&&(y=!!r[b]),i={},D(o=e,function(n){!i[n]&&T(o,n,!1)&&(i[n]=o[n])}),i),y=(t(e,function(n,t,r,i){function e(n,t,r){var e,o=t[r];return o[_]&&i&&!1!==(e=n[v]||{})[I]&&(o=(e[t[g]]||{})[r]||o),function(){return o.apply(n,arguments)}}for(var o={},f=(D(r,function(n){o[n]=e(t,r,n)}),x(n)),u=[];f&&!k(f)&&!B(u,f);)D(f,function(n){!o[n]&&T(f,n,!O)&&(o[n]=e(t,f,n))}),u.push(f),f=x(f);return o}(a,e,p,y)),!!O&&!!n[w]);f=a,t=l,u=e,s=p,n=!1!==(y=y&&r?!!r[w]:y),M(f)||(a=u[v]=u[v]||{},c=a[t]=a[t]||{},!1!==a[I]&&(a[I]=!!n),D(u,function(n){var r,e,o;T(u,n,!1)&&u[n]!==s[n]&&(c[n]=u[n],delete u[n],F(f,n)&&(!f[n]||f[n][_])||(f[n]=(r=f,e=n,(o=function(){var n,t;return(function(n,t,r,e){var o=null;if(n&&F(r,g)){var i=n[v]||{};if((o=(i[r[g]]||{})[t])||j("Missing ["+t+"] "+h),!o[m]&&!1!==i[I]){for(var f=!F(n,t),u=x(n),s=[];f&&u&&!k(u)&&!B(s,u);){var c=u[t];if(c){f=c===e;break}s.push(u),u=x(u)}try{f&&(n[t]=o),o[m]=1}catch(a){i[I]=!1}}}return o}(this,e,r,o)||(typeof(t=(t=r[n=e])===o?x(r)[n]:t)!==h&&j("["+n+"] is not a "+h),t)).apply(this,arguments)})[_]=1,o)))}))}return A[P]={setInstFuncs:!0,useBaseInst:!0},A};"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):((n="undefined"!=typeof globalThis?globalThis:n||self).Microsoft=n.Microsoft||{},n.Microsoft["DynamicProto-JS"]=t());
 //# sourceMappingURL=dynamicproto-js.min.js.map

lib/src/DynamicProto.ts

@@ -64,7 +64,2 @@ // Copyright (c) Microsoft Corporation. All rights reserved.
 /**
- * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
- */
-const DynProtoPolyProto = "_dynProto";
-
-/**
  * Value used as the name of a class when it cannot be determined
@@ -82,2 +77,12 @@ * @ignore
 /**
+ * The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
+ */
+const DynProtoBaseProto = "_dyn" + str__Proto;
+
+/**
+ * Track the current prototype for IE8 as you can't look back to get the prototype
+ */
+const DynProtoCurrent = "_dynInstProto";
+ 
+/**
  * Constant string defined to support minimization
@@ -103,2 +108,7 @@ * @ignore
 /**
+ * Pre-lookup to check for the existence of this function
+ */
+let _objGetOwnProps = Obj["getOwnPropertyNames"];
+
+/**
  * Internal Global used to generate a unique dynamic class name, every new class will increase this value
@@ -139,4 +149,6 @@ * @ignore
 function _getObjProto(target:any) {
+    let newProto;
+
     if (target) {
-        // This method doesn't existing in older browsers (e.g. IE8)
+        // This method doesn't exist in older browsers (e.g. IE8)
         if (_objGetPrototypeOf) {
@@ -146,15 +158,16 @@ return _objGetPrototypeOf(target);
 
-        // target[Constructor] May break if the constructor has been changed or removed
-        let newProto = target[DynProtoPolyProto] || target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
-        if(newProto) {
-            // Set the _dynProto so the hierarchy can lookup base classes correctly on IE8
-            if (!target[DynProtoPolyProto]) {
-                target[DynProtoPolyProto] = newProto;
-            }
+        let curProto = target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
 
-            return newProto;
+        // Using the pre-calculated value as IE8 doesn't support looking up the prototype of a prototype and thus fails for more than 1 base class
+        newProto = target[DynProtoBaseProto] || curProto;
+        if (!_hasOwnProperty(target, DynProtoBaseProto)) {
+            // As this prototype doesn't have this property then this is from an inherited class so newProto is the base to return so save it
+            // so we can look it up value (which for a multiple hierarchy dynamicProto will be the base class)
+            delete target[DynProtoCurrent];     // Delete any current value allocated to this instance so we pick up the value from prototype hierarchy
+            newProto = target[DynProtoBaseProto] = target[DynProtoCurrent] || target[DynProtoBaseProto];
+            target[DynProtoCurrent] = curProto;
         }
     }
 
-    return null;
+    return newProto;
 }
@@ -169,5 +182,4 @@
     let props: string[] = [];
-    let getOwnProps = Obj["getOwnPropertyNames"];
-    if (getOwnProps) {
-        props = getOwnProps(target);
+    if (_objGetOwnProps) {
+        props = _objGetOwnProps(target);
     } else {
@@ -174,0 +186,0 @@ for (let name in target) {

package.json

 {
   "name": "@microsoft/dynamicproto-js",
   "description": "Microsoft Dynamic Proto Utility",
-  "version": "1.1.5",
+  "version": "1.1.6",
   "keywords": [
@@ -6,0 +6,0 @@ "javascript",

RELEASES.md

 # Releases
 
+## 1.1.6 (May 4th, 2022)
+
+- #50 [IE8] Fix in 1.1.5 only handles 2 levels of dynamically nested classes
+
 ## 1.1.5 (Apr 28th, 2022)
@@ -4,0 +8,0 @@

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License

This package is not allowed per your license policy. Review the package's license to ensure compliance.

Found 1 instance in 1 package

Fixed alerts

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This package is not allowed per your license policy. Review the package's license to ensure compliance.

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Improved metrics

Total package byte prevSize

4221053

increased by0.6%

Lines of code

35637

increased by0.23%

No dependency changes