From 112cdb63f9fccdda8e6cd12966724175eefbe897 Mon Sep 17 00:00:00 2001
From: Taritsyn <taritsyn@gmail.com>
Date: Tue, 8 Oct 2019 21:28:52 +0300
Subject: [PATCH] In BundleTransformer.Handlebars added support of the
 Handlebars version 4.4.2

---
 .../externs/handlebars/handlebars.runtime.js  |  12 +-
 .../Scripts/handlebars/handlebars.runtime.js  |  95 +++++++----
 .../handlebars/handlebars.runtime.min.js      |   4 +-
 .../BundleTransformer.Handlebars.csproj       |   4 +-
 .../Resources/handlebars.js                   | 147 ++++++++++++------
 src/BundleTransformer.Handlebars/readme.txt   |   4 +-
 6 files changed, 176 insertions(+), 90 deletions(-)

diff --git a/samples/BundleTransformer.Sample.AspNet4.Mvc4/Scripts/externs/handlebars/handlebars.runtime.js b/samples/BundleTransformer.Sample.AspNet4.Mvc4/Scripts/externs/handlebars/handlebars.runtime.js
index c08c0244b..86a135e42 100644
--- a/samples/BundleTransformer.Sample.AspNet4.Mvc4/Scripts/externs/handlebars/handlebars.runtime.js
+++ b/samples/BundleTransformer.Sample.AspNet4.Mvc4/Scripts/externs/handlebars/handlebars.runtime.js
@@ -13,9 +13,11 @@
 	"decorators": {
 		"inline": function(){}
 	},
+	"__esModule": {},
 	"HandlebarsEnvironment": function(){},
 	"VERSION": {},
 	"COMPILER_REVISION": {},
+	"LAST_COMPATIBLE_COMPILER_REVISION": {},
 	"REVISION_CHANGES": {
 		"1": {},
 		"2": {},
@@ -23,7 +25,8 @@
 		"4": {},
 		"5": {},
 		"6": {},
-		"7": {}
+		"7": {},
+		"8": {}
 	},
 	"log": function(){},
 	"createFrame": function(){},
@@ -41,6 +44,7 @@
 	"SafeString": function(){},
 	"Exception": function(){},
 	"Utils": {
+		"__esModule": {},
 		"extend": function(){},
 		"indexOf": function(){},
 		"escapeExpression": function(){},
@@ -53,6 +57,7 @@
 	},
 	"escapeExpression": function(){},
 	"VM": {
+		"__esModule": {},
 		"checkRevision": function(){},
 		"template": function(){},
 		"wrapProgram": function(){},
@@ -70,9 +75,4 @@
 	"unregisterPartial": function(){},
 	"registerDecorator": function(){},
 	"unregisterDecorator": function(){}
-};
-
-var container = {
-	program: function() {},
-	noop: function() {}
 };
\ No newline at end of file
diff --git a/samples/BundleTransformer.Sample.AspNet4.Mvc4/Scripts/handlebars/handlebars.runtime.js b/samples/BundleTransformer.Sample.AspNet4.Mvc4/Scripts/handlebars/handlebars.runtime.js
index 69afa39a2..4fa4c546e 100644
--- a/samples/BundleTransformer.Sample.AspNet4.Mvc4/Scripts/handlebars/handlebars.runtime.js
+++ b/samples/BundleTransformer.Sample.AspNet4.Mvc4/Scripts/handlebars/handlebars.runtime.js
@@ -1,7 +1,7 @@
 /**!
 
  @license
- handlebars v4.2.0
+ handlebars v4.4.2
 
 Copyright (C) 2011-2017 by Yehuda Katz
 
@@ -207,11 +207,13 @@ return /******/ (function(modules) { // webpackBootstrap
 
 	var _logger2 = _interopRequireDefault(_logger);
 
-	var VERSION = '4.2.0';
+	var VERSION = '4.4.2';
 	exports.VERSION = VERSION;
-	var COMPILER_REVISION = 7;
-
+	var COMPILER_REVISION = 8;
 	exports.COMPILER_REVISION = COMPILER_REVISION;
+	var LAST_COMPATIBLE_COMPILER_REVISION = 7;
+
+	exports.LAST_COMPATIBLE_COMPILER_REVISION = LAST_COMPATIBLE_COMPILER_REVISION;
 	var REVISION_CHANGES = {
 	  1: '<= 1.0.rc.2', // 1.0.rc.2 is actually rev2 but doesn't report it
 	  2: '== 1.0.0-rc.3',
@@ -219,7 +221,8 @@ return /******/ (function(modules) { // webpackBootstrap
 	  4: '== 1.x.x',
 	  5: '== 2.0.0-alpha.x',
 	  6: '>= 2.0.0-beta.1',
-	  7: '>= 4.0.0'
+	  7: '>= 4.0.0 <4.3.0',
+	  8: '>= 4.3.0'
 	};
 
 	exports.REVISION_CHANGES = REVISION_CHANGES;
@@ -303,6 +306,7 @@ return /******/ (function(modules) { // webpackBootstrap
 	exports.createFrame = createFrame;
 	exports.blockParams = blockParams;
 	exports.appendContextPath = appendContextPath;
+
 	var escape = {
 	  '&': '&amp;',
 	  '<': '&lt;',
@@ -520,6 +524,7 @@ return /******/ (function(modules) { // webpackBootstrap
 
 	exports.__esModule = true;
 	exports.registerDefaultHelpers = registerDefaultHelpers;
+	exports.moveHelperToHooks = moveHelperToHooks;
 
 	var _helpersBlockHelperMissing = __webpack_require__(10);
 
@@ -559,6 +564,15 @@ return /******/ (function(modules) { // webpackBootstrap
 	  _helpersWith2['default'](instance);
 	}
 
+	function moveHelperToHooks(instance, helperName, keepHelper) {
+	  if (instance.helpers[helperName]) {
+	    instance.hooks[helperName] = instance.helpers[helperName];
+	    if (!keepHelper) {
+	      delete instance.helpers[helperName];
+	    }
+	  }
+	}
+
 /***/ }),
 /* 10 */
 /***/ (function(module, exports, __webpack_require__) {
@@ -606,7 +620,7 @@ return /******/ (function(modules) { // webpackBootstrap
 /* 11 */
 /***/ (function(module, exports, __webpack_require__) {
 
-	'use strict';
+	/* WEBPACK VAR INJECTION */(function(global) {'use strict';
 
 	var _interopRequireDefault = __webpack_require__(2)['default'];
 
@@ -668,6 +682,16 @@ return /******/ (function(modules) { // webpackBootstrap
 	            execIteration(i, i, i === context.length - 1);
 	          }
 	        }
+	      } else if (global.Symbol && context[global.Symbol.iterator]) {
+	        var newContext = [];
+	        var iterator = context[global.Symbol.iterator]();
+	        for (var it = iterator.next(); !it.done; it = iterator.next()) {
+	          newContext.push(it.value);
+	        }
+	        context = newContext;
+	        for (var j = context.length; i < j; i++) {
+	          execIteration(i, i, i === context.length - 1);
+	        }
 	      } else {
 	        var priorKey = undefined;
 
@@ -698,6 +722,7 @@ return /******/ (function(modules) { // webpackBootstrap
 	};
 
 	module.exports = exports['default'];
+	/* WEBPACK VAR INJECTION */}.call(exports, (function() { return this; }())))
 
 /***/ }),
 /* 12 */
@@ -1001,23 +1026,28 @@ return /******/ (function(modules) { // webpackBootstrap
 
 	var _base = __webpack_require__(3);
 
+	var _helpers = __webpack_require__(9);
+
 	function checkRevision(compilerInfo) {
 	  var compilerRevision = compilerInfo && compilerInfo[0] || 1,
 	      currentRevision = _base.COMPILER_REVISION;
 
-	  if (compilerRevision !== currentRevision) {
-	    if (compilerRevision < currentRevision) {
-	      var runtimeVersions = _base.REVISION_CHANGES[currentRevision],
-	          compilerVersions = _base.REVISION_CHANGES[compilerRevision];
-	      throw new _exception2['default']('Template was precompiled with an older version of Handlebars than the current runtime. ' + 'Please update your precompiler to a newer version (' + runtimeVersions + ') or downgrade your runtime to an older version (' + compilerVersions + ').');
-	    } else {
-	      // Use the embedded version info since the runtime doesn't know about this revision yet
-	      throw new _exception2['default']('Template was precompiled with a newer version of Handlebars than the current runtime. ' + 'Please update your runtime to a newer version (' + compilerInfo[1] + ').');
-	    }
+	  if (compilerRevision >= _base.LAST_COMPATIBLE_COMPILER_REVISION && compilerRevision <= _base.COMPILER_REVISION) {
+	    return;
+	  }
+
+	  if (compilerRevision < _base.LAST_COMPATIBLE_COMPILER_REVISION) {
+	    var runtimeVersions = _base.REVISION_CHANGES[currentRevision],
+	        compilerVersions = _base.REVISION_CHANGES[compilerRevision];
+	    throw new _exception2['default']('Template was precompiled with an older version of Handlebars than the current runtime. ' + 'Please update your precompiler to a newer version (' + runtimeVersions + ') or downgrade your runtime to an older version (' + compilerVersions + ').');
+	  } else {
+	    // Use the embedded version info since the runtime doesn't know about this revision yet
+	    throw new _exception2['default']('Template was precompiled with a newer version of Handlebars than the current runtime. ' + 'Please update your runtime to a newer version (' + compilerInfo[1] + ').');
 	  }
 	}
 
 	function template(templateSpec, env) {
+
 	  /* istanbul ignore next */
 	  if (!env) {
 	    throw new _exception2['default']('No environment passed to template');
@@ -1029,9 +1059,12 @@ return /******/ (function(modules) { // webpackBootstrap
 	  templateSpec.main.decorator = templateSpec.main_d;
 
 	  // Note: Using env.VM references rather than local var references throughout this section to allow
-	  // for external users to override these as psuedo-supported APIs.
+	  // for external users to override these as pseudo-supported APIs.
 	  env.VM.checkRevision(templateSpec.compiler);
 
+	  // backwards compatibility for precompiled templates with compiler-version 7 (<4.3.0)
+	  var templateWasPrecompiledWithCompilerV7 = templateSpec.compiler && templateSpec.compiler[0] === 7;
+
 	  function invokePartialWrapper(partial, context, options) {
 	    if (options.hash) {
 	      context = Utils.extend({}, context, options.hash);
@@ -1039,13 +1072,15 @@ return /******/ (function(modules) { // webpackBootstrap
 	        options.ids[0] = true;
 	      }
 	    }
-
 	    partial = env.VM.resolvePartial.call(this, partial, context, options);
-	    var result = env.VM.invokePartial.call(this, partial, context, options);
+
+	    var optionsWithHooks = Utils.extend({}, options, { hooks: this.hooks });
+
+	    var result = env.VM.invokePartial.call(this, partial, context, optionsWithHooks);
 
 	    if (result == null && env.compile) {
 	      options.partials[options.name] = env.compile(partial, templateSpec.compilerOptions, env);
-	      result = options.partials[options.name](context, options);
+	      result = options.partials[options.name](context, optionsWithHooks);
 	    }
 	    if (result != null) {
 	      if (options.indent) {
@@ -1112,15 +1147,6 @@ return /******/ (function(modules) { // webpackBootstrap
 	      }
 	      return value;
 	    },
-	    merge: function merge(param, common) {
-	      var obj = param || common;
-
-	      if (param && common && param !== common) {
-	        obj = Utils.extend({}, common, param);
-	      }
-
-	      return obj;
-	    },
 	    // An empty object to use as replacement for null-contexts
 	    nullContext: _Object$seal({}),
 
@@ -1157,18 +1183,25 @@ return /******/ (function(modules) { // webpackBootstrap
 
 	  ret._setup = function (options) {
 	    if (!options.partial) {
-	      container.helpers = container.merge(options.helpers, env.helpers);
+	      container.helpers = Utils.extend({}, env.helpers, options.helpers);
 
 	      if (templateSpec.usePartial) {
-	        container.partials = container.merge(options.partials, env.partials);
+	        container.partials = Utils.extend({}, env.partials, options.partials);
 	      }
 	      if (templateSpec.usePartial || templateSpec.useDecorators) {
-	        container.decorators = container.merge(options.decorators, env.decorators);
+	        container.decorators = Utils.extend({}, env.decorators, options.decorators);
 	      }
+
+	      container.hooks = {};
+
+	      var keepHelperInHelpers = options.allowCallsToHelperMissing || templateWasPrecompiledWithCompilerV7;
+	      _helpers.moveHelperToHooks(container, 'helperMissing', keepHelperInHelpers);
+	      _helpers.moveHelperToHooks(container, 'blockHelperMissing', keepHelperInHelpers);
 	    } else {
 	      container.helpers = options.helpers;
 	      container.partials = options.partials;
 	      container.decorators = options.decorators;
+	      container.hooks = options.hooks;
 	    }
 	  };
 
diff --git a/samples/BundleTransformer.Sample.AspNet4.Mvc4/Scripts/handlebars/handlebars.runtime.min.js b/samples/BundleTransformer.Sample.AspNet4.Mvc4/Scripts/handlebars/handlebars.runtime.min.js
index a4975e12c..7a414225a 100644
--- a/samples/BundleTransformer.Sample.AspNet4.Mvc4/Scripts/handlebars/handlebars.runtime.min.js
+++ b/samples/BundleTransformer.Sample.AspNet4.Mvc4/Scripts/handlebars/handlebars.runtime.min.js
@@ -1,7 +1,7 @@
 /**!
 
  @license
- handlebars v4.2.0
+ handlebars v4.4.2
 
 Copyright (C) 2011-2017 by Yehuda Katz
 
@@ -24,4 +24,4 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 
 */
-!function(a,b){"object"==typeof exports&&"object"==typeof module?module.exports=b():"function"==typeof define&&define.amd?define([],b):"object"==typeof exports?exports.Handlebars=b():a.Handlebars=b()}(this,function(){return function(a){function b(d){if(c[d])return c[d].exports;var e=c[d]={exports:{},id:d,loaded:!1};return a[d].call(e.exports,e,e.exports,b),e.loaded=!0,e.exports}var c={};return b.m=a,b.c=c,b.p="",b(0)}([function(a,b,c){"use strict";function d(){var a=new h.HandlebarsEnvironment;return n.extend(a,h),a.SafeString=j["default"],a.Exception=l["default"],a.Utils=n,a.escapeExpression=n.escapeExpression,a.VM=p,a.template=function(b){return p.template(b,a)},a}var e=c(1)["default"],f=c(2)["default"];b.__esModule=!0;var g=c(3),h=e(g),i=c(20),j=f(i),k=c(5),l=f(k),m=c(4),n=e(m),o=c(21),p=e(o),q=c(33),r=f(q),s=d();s.create=d,r["default"](s),s["default"]=s,b["default"]=s,a.exports=b["default"]},function(a,b){"use strict";b["default"]=function(a){if(a&&a.__esModule)return a;var b={};if(null!=a)for(var c in a)Object.prototype.hasOwnProperty.call(a,c)&&(b[c]=a[c]);return b["default"]=a,b},b.__esModule=!0},function(a,b){"use strict";b["default"]=function(a){return a&&a.__esModule?a:{"default":a}},b.__esModule=!0},function(a,b,c){"use strict";function d(a,b,c){this.helpers=a||{},this.partials=b||{},this.decorators=c||{},i.registerDefaultHelpers(this),j.registerDefaultDecorators(this)}var e=c(2)["default"];b.__esModule=!0,b.HandlebarsEnvironment=d;var f=c(4),g=c(5),h=e(g),i=c(9),j=c(17),k=c(19),l=e(k),m="4.2.0";b.VERSION=m;var n=7;b.COMPILER_REVISION=n;var o={1:"<= 1.0.rc.2",2:"== 1.0.0-rc.3",3:"== 1.0.0-rc.4",4:"== 1.x.x",5:"== 2.0.0-alpha.x",6:">= 2.0.0-beta.1",7:">= 4.0.0"};b.REVISION_CHANGES=o;var p="[object Object]";d.prototype={constructor:d,logger:l["default"],log:l["default"].log,registerHelper:function(a,b){if(f.toString.call(a)===p){if(b)throw new h["default"]("Arg not supported with multiple helpers");f.extend(this.helpers,a)}else 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h=a(e,f);return c.partials=g,h}),b.partials[e.args[0]]=e.fn,f})},a.exports=b["default"]},function(a,b,c){"use strict";b.__esModule=!0;var d=c(4),e={methodMap:["debug","info","warn","error"],level:"info",lookupLevel:function(a){if("string"==typeof a){var b=d.indexOf(e.methodMap,a.toLowerCase());a=b>=0?b:parseInt(a,10)}return a},log:function(a){if(a=e.lookupLevel(a),"undefined"!=typeof console&&e.lookupLevel(e.level)<=a){var b=e.methodMap[a];console[b]||(b="log");for(var c=arguments.length,d=Array(c>1?c-1:0),f=1;f<c;f++)d[f-1]=arguments[f];console[b].apply(console,d)}}};b["default"]=e,a.exports=b["default"]},function(a,b){"use strict";function c(a){this.string=a}b.__esModule=!0,c.prototype.toString=c.prototype.toHTML=function(){return""+this.string},b["default"]=c,a.exports=b["default"]},function(a,b,c){"use strict";function d(a){var b=a&&a[0]||1,c=s.COMPILER_REVISION;if(!(b>=s.LAST_COMPATIBLE_COMPILER_REVISION&&b<=s.COMPILER_REVISION)){if(b<s.LAST_COMPATIBLE_COMPILER_REVISION){var d=s.REVISION_CHANGES[c],e=s.REVISION_CHANGES[b];throw new r["default"]("Template was precompiled with an older version of Handlebars than the current runtime. Please update your precompiler to a newer version ("+d+") or downgrade your runtime to an older version ("+e+").")}throw new r["default"]("Template was precompiled with a newer version of Handlebars than the current runtime. Please update your runtime to a newer version ("+a[1]+").")}}function e(a,b){function c(c,d,e){e.hash&&(d=p.extend({},d,e.hash),e.ids&&(e.ids[0]=!0)),c=b.VM.resolvePartial.call(this,c,d,e);var f=p.extend({},e,{hooks:this.hooks}),g=b.VM.invokePartial.call(this,c,d,f);if(null==g&&b.compile&&(e.partials[e.name]=b.compile(c,a.compilerOptions,b),g=e.partials[e.name](d,f)),null!=g){if(e.indent){for(var h=g.split("\n"),i=0,j=h.length;i<j&&(h[i]||i+1!==j);i++)h[i]=e.indent+h[i];g=h.join("\n")}return g}throw new r["default"]("The partial "+e.name+" could not be compiled when running in runtime-only mode")}function d(b){function c(b){return""+a.main(g,b,g.helpers,g.partials,f,i,h)}var e=arguments.length<=1||void 0===arguments[1]?{}:arguments[1],f=e.data;d._setup(e),!e.partial&&a.useData&&(f=j(b,f));var h=void 0,i=a.useBlockParams?[]:void 0;return a.useDepths&&(h=e.depths?b!=e.depths[0]?[b].concat(e.depths):e.depths:[b]),(c=k(a.main,c,g,e.depths||[],f,i))(b,e)}if(!b)throw new r["default"]("No environment passed to template");if(!a||!a.main)throw new r["default"]("Unknown template object: "+typeof a);a.main.decorator=a.main_d,b.VM.checkRevision(a.compiler);var e=a.compiler&&7===a.compiler[0],g={strict:function(a,b){if(!(b in a))throw new r["default"]('"'+b+'" not defined in '+a);return a[b]},lookup:function(a,b){for(var c=a.length,d=0;d<c;d++)if(a[d]&&null!=a[d][b])return a[d][b]},lambda:function(a,b){return"function"==typeof a?a.call(b):a},escapeExpression:p.escapeExpression,invokePartial:c,fn:function(b){var c=a[b];return c.decorator=a[b+"_d"],c},programs:[],program:function(a,b,c,d,e){var g=this.programs[a],h=this.fn(a);return b||e||d||c?g=f(this,a,h,b,c,d,e):g||(g=this.programs[a]=f(this,a,h)),g},data:function(a,b){for(;a&&b--;)a=a._parent;return a},nullContext:l({}),noop:b.VM.noop,compilerInfo:a.compiler};return d.isTop=!0,d._setup=function(c){if(c.partial)g.helpers=c.helpers,g.partials=c.partials,g.decorators=c.decorators,g.hooks=c.hooks;else{g.helpers=p.extend({},b.helpers,c.helpers),a.usePartial&&(g.partials=p.extend({},b.partials,c.partials)),(a.usePartial||a.useDecorators)&&(g.decorators=p.extend({},b.decorators,c.decorators)),g.hooks={};var d=c.allowCallsToHelperMissing||e;t.moveHelperToHooks(g,"helperMissing",d),t.moveHelperToHooks(g,"blockHelperMissing",d)}},d._child=function(b,c,d,e){if(a.useBlockParams&&!d)throw new r["default"]("must pass block params");if(a.useDepths&&!e)throw new r["default"]("must pass parent depths");return f(g,b,a[b],c,0,d,e)},d}function f(a,b,c,d,e,f,g){function h(b){var e=arguments.length<=1||void 0===arguments[1]?{}:arguments[1],h=g;return!g||b==g[0]||b===a.nullContext&&null===g[0]||(h=[b].concat(g)),c(a,b,a.helpers,a.partials,e.data||d,f&&[e.blockParams].concat(f),h)}return h=k(c,h,a,g,d,f),h.program=b,h.depth=g?g.length:0,h.blockParams=e||0,h}function g(a,b,c){return a?a.call||c.name||(c.name=a,a=c.partials[a]):a="@partial-block"===c.name?c.data["partial-block"]:c.partials[c.name],a}function h(a,b,c){var d=c.data&&c.data["partial-block"];c.partial=!0,c.ids&&(c.data.contextPath=c.ids[0]||c.data.contextPath);var e=void 0;if(c.fn&&c.fn!==i&&!function(){c.data=s.createFrame(c.data);var a=c.fn;e=c.data["partial-block"]=function(b){var c=arguments.length<=1||void 0===arguments[1]?{}:arguments[1];return c.data=s.createFrame(c.data),c.data["partial-block"]=d,a(b,c)},a.partials&&(c.partials=p.extend({},c.partials,a.partials))}(),void 0===a&&e&&(a=e),void 0===a)throw new r["default"]("The partial "+c.name+" could not be found");if(a instanceof Function)return a(b,c)}function i(){return""}function j(a,b){return b&&"root"in b||(b=b?s.createFrame(b):{},b.root=a),b}function k(a,b,c,d,e,f){if(a.decorator){var g={};b=a.decorator(b,g,c,d&&d[0],e,f,d),p.extend(b,g)}return b}var l=c(22)["default"],m=c(1)["default"],n=c(2)["default"];b.__esModule=!0,b.checkRevision=d,b.template=e,b.wrapProgram=f,b.resolvePartial=g,b.invokePartial=h,b.noop=i;var o=c(4),p=m(o),q=c(5),r=n(q),s=c(3),t=c(9)},function(a,b,c){a.exports={"default":c(23),__esModule:!0}},function(a,b,c){c(24),a.exports=c(29).Object.seal},function(a,b,c){var d=c(25);c(26)("seal",function(a){return function(b){return a&&d(b)?a(b):b}})},function(a,b){a.exports=function(a){return"object"==typeof a?null!==a:"function"==typeof a}},function(a,b,c){var d=c(27),e=c(29),f=c(32);a.exports=function(a,b){var c=(e.Object||{})[a]||Object[a],g={};g[a]=b(c),d(d.S+d.F*f(function(){c(1)}),"Object",g)}},function(a,b,c){var d=c(28),e=c(29),f=c(30),g="prototype",h=function(a,b,c){var i,j,k,l=a&h.F,m=a&h.G,n=a&h.S,o=a&h.P,p=a&h.B,q=a&h.W,r=m?e:e[b]||(e[b]={}),s=m?d:n?d[b]:(d[b]||{})[g];m&&(c=b);for(i in c)j=!l&&s&&i in s,j&&i in r||(k=j?s[i]:c[i],r[i]=m&&"function"!=typeof s[i]?c[i]:p&&j?f(k,d):q&&s[i]==k?function(a){var b=function(b){return this instanceof a?new a(b):a(b)};return b[g]=a[g],b}(k):o&&"function"==typeof k?f(Function.call,k):k,o&&((r[g]||(r[g]={}))[i]=k))};h.F=1,h.G=2,h.S=4,h.P=8,h.B=16,h.W=32,a.exports=h},function(a,b){var c=a.exports="undefined"!=typeof window&&window.Math==Math?window:"undefined"!=typeof self&&self.Math==Math?self:Function("return this")();"number"==typeof __g&&(__g=c)},function(a,b){var c=a.exports={version:"1.2.6"};"number"==typeof __e&&(__e=c)},function(a,b,c){var d=c(31);a.exports=function(a,b,c){if(d(a),void 0===b)return a;switch(c){case 1:return function(c){return a.call(b,c)};case 2:return function(c,d){return a.call(b,c,d)};case 3:return function(c,d,e){return a.call(b,c,d,e)}}return function(){return a.apply(b,arguments)}}},function(a,b){a.exports=function(a){if("function"!=typeof a)throw TypeError(a+" is not a function!");return a}},function(a,b){a.exports=function(a){try{return!!a()}catch(b){return!0}}},function(a,b){(function(c){"use strict";b.__esModule=!0,b["default"]=function(a){var b="undefined"!=typeof c?c:window,d=b.Handlebars;a.noConflict=function(){return b.Handlebars===a&&(b.Handlebars=d),a}},a.exports=b["default"]}).call(b,function(){return this}())}])});
\ No newline at end of file
diff --git a/src/BundleTransformer.Handlebars/BundleTransformer.Handlebars.csproj b/src/BundleTransformer.Handlebars/BundleTransformer.Handlebars.csproj
index 12c329f8b..80fb3e844 100644
--- a/src/BundleTransformer.Handlebars/BundleTransformer.Handlebars.csproj
+++ b/src/BundleTransformer.Handlebars/BundleTransformer.Handlebars.csproj
@@ -8,12 +8,12 @@
 		<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
 		<NoWarn>$(NoWarn);CS1591;NU5125</NoWarn>
 		<GenerateDocumentationFile>true</GenerateDocumentationFile>
-		<Description>BundleTransformer.Handlebars contains one translator-adapter - `HandlebarsTranslator` (supports the Handlebars (http://handlebarsjs.com) version 4.2.0). This adapter makes translation of Handlebars templates to JS code. Also contains the `HandlebarsAssetHandler` debugging HTTP handler, which is responsible for text output of translated Handlebars asset.
+		<Description>BundleTransformer.Handlebars contains one translator-adapter - `HandlebarsTranslator` (supports the Handlebars (http://handlebarsjs.com) version 4.4.2). This adapter makes translation of Handlebars templates to JS code. Also contains the `HandlebarsAssetHandler` debugging HTTP handler, which is responsible for text output of translated Handlebars asset.
 
 As a JS engine is used the JavaScript Engine Switcher library (https://github.com/Taritsyn/JavaScriptEngineSwitcher). For correct working of this module, you need to install one of the following NuGet packages: JavaScriptEngineSwitcher.Msie, JavaScriptEngineSwitcher.V8 or JavaScriptEngineSwitcher.ChakraCore.</Description>
 		<PackageIconUrl>https://raw.githubusercontent.com/Taritsyn/BundleTransformer/master/images/icons/128/BundleTransformer_Handlebars_Logo_128x128.png</PackageIconUrl>
 		<PackageTags>BundleTransformer;System.Web.Optimization;IBundleTransform;ASP.NET;JavaScript;JS;Bundling;Handlebars;Translation;Translator;Compilation;Compiler</PackageTags>
-		<PackageReleaseNotes>Added support of Handlebars version 4.2.0.</PackageReleaseNotes>
+		<PackageReleaseNotes>Added support of the Handlebars version 4.4.2.</PackageReleaseNotes>
 	</PropertyGroup>
 
 	<Import Project="../../build/common.props" />
diff --git a/src/BundleTransformer.Handlebars/Resources/handlebars.js b/src/BundleTransformer.Handlebars/Resources/handlebars.js
index f40984c98..7575fe079 100644
--- a/src/BundleTransformer.Handlebars/Resources/handlebars.js
+++ b/src/BundleTransformer.Handlebars/Resources/handlebars.js
@@ -1,7 +1,7 @@
 /**!
 
  @license
- handlebars v4.2.0
+ handlebars v4.4.2
 
 Copyright (C) 2011-2017 by Yehuda Katz
 
@@ -275,11 +275,13 @@ return /******/ (function(modules) { // webpackBootstrap
 
 	var _logger2 = _interopRequireDefault(_logger);
 
-	var VERSION = '4.2.0';
+	var VERSION = '4.4.2';
 	exports.VERSION = VERSION;
-	var COMPILER_REVISION = 7;
-
+	var COMPILER_REVISION = 8;
 	exports.COMPILER_REVISION = COMPILER_REVISION;
+	var LAST_COMPATIBLE_COMPILER_REVISION = 7;
+
+	exports.LAST_COMPATIBLE_COMPILER_REVISION = LAST_COMPATIBLE_COMPILER_REVISION;
 	var REVISION_CHANGES = {
 	  1: '<= 1.0.rc.2', // 1.0.rc.2 is actually rev2 but doesn't report it
 	  2: '== 1.0.0-rc.3',
@@ -287,7 +289,8 @@ return /******/ (function(modules) { // webpackBootstrap
 	  4: '== 1.x.x',
 	  5: '== 2.0.0-alpha.x',
 	  6: '>= 2.0.0-beta.1',
-	  7: '>= 4.0.0'
+	  7: '>= 4.0.0 <4.3.0',
+	  8: '>= 4.3.0'
 	};
 
 	exports.REVISION_CHANGES = REVISION_CHANGES;
@@ -371,6 +374,7 @@ return /******/ (function(modules) { // webpackBootstrap
 	exports.createFrame = createFrame;
 	exports.blockParams = blockParams;
 	exports.appendContextPath = appendContextPath;
+
 	var escape = {
 	  '&': '&amp;',
 	  '<': '&lt;',
@@ -588,6 +592,7 @@ return /******/ (function(modules) { // webpackBootstrap
 
 	exports.__esModule = true;
 	exports.registerDefaultHelpers = registerDefaultHelpers;
+	exports.moveHelperToHooks = moveHelperToHooks;
 
 	var _helpersBlockHelperMissing = __webpack_require__(11);
 
@@ -627,6 +632,15 @@ return /******/ (function(modules) { // webpackBootstrap
 	  _helpersWith2['default'](instance);
 	}
 
+	function moveHelperToHooks(instance, helperName, keepHelper) {
+	  if (instance.helpers[helperName]) {
+	    instance.hooks[helperName] = instance.helpers[helperName];
+	    if (!keepHelper) {
+	      delete instance.helpers[helperName];
+	    }
+	  }
+	}
+
 /***/ }),
 /* 11 */
 /***/ (function(module, exports, __webpack_require__) {
@@ -674,7 +688,7 @@ return /******/ (function(modules) { // webpackBootstrap
 /* 12 */
 /***/ (function(module, exports, __webpack_require__) {
 
-	'use strict';
+	/* WEBPACK VAR INJECTION */(function(global) {'use strict';
 
 	var _interopRequireDefault = __webpack_require__(1)['default'];
 
@@ -736,6 +750,16 @@ return /******/ (function(modules) { // webpackBootstrap
 	            execIteration(i, i, i === context.length - 1);
 	          }
 	        }
+	      } else if (global.Symbol && context[global.Symbol.iterator]) {
+	        var newContext = [];
+	        var iterator = context[global.Symbol.iterator]();
+	        for (var it = iterator.next(); !it.done; it = iterator.next()) {
+	          newContext.push(it.value);
+	        }
+	        context = newContext;
+	        for (var j = context.length; i < j; i++) {
+	          execIteration(i, i, i === context.length - 1);
+	        }
 	      } else {
 	        var priorKey = undefined;
 
@@ -766,6 +790,7 @@ return /******/ (function(modules) { // webpackBootstrap
 	};
 
 	module.exports = exports['default'];
+	/* WEBPACK VAR INJECTION */}.call(exports, (function() { return this; }())))
 
 /***/ }),
 /* 13 */
@@ -1069,23 +1094,28 @@ return /******/ (function(modules) { // webpackBootstrap
 
 	var _base = __webpack_require__(4);
 
+	var _helpers = __webpack_require__(10);
+
 	function checkRevision(compilerInfo) {
 	  var compilerRevision = compilerInfo && compilerInfo[0] || 1,
 	      currentRevision = _base.COMPILER_REVISION;
 
-	  if (compilerRevision !== currentRevision) {
-	    if (compilerRevision < currentRevision) {
-	      var runtimeVersions = _base.REVISION_CHANGES[currentRevision],
-	          compilerVersions = _base.REVISION_CHANGES[compilerRevision];
-	      throw new _exception2['default']('Template was precompiled with an older version of Handlebars than the current runtime. ' + 'Please update your precompiler to a newer version (' + runtimeVersions + ') or downgrade your runtime to an older version (' + compilerVersions + ').');
-	    } else {
-	      // Use the embedded version info since the runtime doesn't know about this revision yet
-	      throw new _exception2['default']('Template was precompiled with a newer version of Handlebars than the current runtime. ' + 'Please update your runtime to a newer version (' + compilerInfo[1] + ').');
-	    }
+	  if (compilerRevision >= _base.LAST_COMPATIBLE_COMPILER_REVISION && compilerRevision <= _base.COMPILER_REVISION) {
+	    return;
+	  }
+
+	  if (compilerRevision < _base.LAST_COMPATIBLE_COMPILER_REVISION) {
+	    var runtimeVersions = _base.REVISION_CHANGES[currentRevision],
+	        compilerVersions = _base.REVISION_CHANGES[compilerRevision];
+	    throw new _exception2['default']('Template was precompiled with an older version of Handlebars than the current runtime. ' + 'Please update your precompiler to a newer version (' + runtimeVersions + ') or downgrade your runtime to an older version (' + compilerVersions + ').');
+	  } else {
+	    // Use the embedded version info since the runtime doesn't know about this revision yet
+	    throw new _exception2['default']('Template was precompiled with a newer version of Handlebars than the current runtime. ' + 'Please update your runtime to a newer version (' + compilerInfo[1] + ').');
 	  }
 	}
 
 	function template(templateSpec, env) {
+
 	  /* istanbul ignore next */
 	  if (!env) {
 	    throw new _exception2['default']('No environment passed to template');
@@ -1097,9 +1127,12 @@ return /******/ (function(modules) { // webpackBootstrap
 	  templateSpec.main.decorator = templateSpec.main_d;
 
 	  // Note: Using env.VM references rather than local var references throughout this section to allow
-	  // for external users to override these as psuedo-supported APIs.
+	  // for external users to override these as pseudo-supported APIs.
 	  env.VM.checkRevision(templateSpec.compiler);
 
+	  // backwards compatibility for precompiled templates with compiler-version 7 (<4.3.0)
+	  var templateWasPrecompiledWithCompilerV7 = templateSpec.compiler && templateSpec.compiler[0] === 7;
+
 	  function invokePartialWrapper(partial, context, options) {
 	    if (options.hash) {
 	      context = Utils.extend({}, context, options.hash);
@@ -1107,13 +1140,15 @@ return /******/ (function(modules) { // webpackBootstrap
 	        options.ids[0] = true;
 	      }
 	    }
-
 	    partial = env.VM.resolvePartial.call(this, partial, context, options);
-	    var result = env.VM.invokePartial.call(this, partial, context, options);
+
+	    var optionsWithHooks = Utils.extend({}, options, { hooks: this.hooks });
+
+	    var result = env.VM.invokePartial.call(this, partial, context, optionsWithHooks);
 
 	    if (result == null && env.compile) {
 	      options.partials[options.name] = env.compile(partial, templateSpec.compilerOptions, env);
-	      result = options.partials[options.name](context, options);
+	      result = options.partials[options.name](context, optionsWithHooks);
 	    }
 	    if (result != null) {
 	      if (options.indent) {
@@ -1180,15 +1215,6 @@ return /******/ (function(modules) { // webpackBootstrap
 	      }
 	      return value;
 	    },
-	    merge: function merge(param, common) {
-	      var obj = param || common;
-
-	      if (param && common && param !== common) {
-	        obj = Utils.extend({}, common, param);
-	      }
-
-	      return obj;
-	    },
 	    // An empty object to use as replacement for null-contexts
 	    nullContext: _Object$seal({}),
 
@@ -1225,18 +1251,25 @@ return /******/ (function(modules) { // webpackBootstrap
 
 	  ret._setup = function (options) {
 	    if (!options.partial) {
-	      container.helpers = container.merge(options.helpers, env.helpers);
+	      container.helpers = Utils.extend({}, env.helpers, options.helpers);
 
 	      if (templateSpec.usePartial) {
-	        container.partials = container.merge(options.partials, env.partials);
+	        container.partials = Utils.extend({}, env.partials, options.partials);
 	      }
 	      if (templateSpec.usePartial || templateSpec.useDecorators) {
-	        container.decorators = container.merge(options.decorators, env.decorators);
+	        container.decorators = Utils.extend({}, env.decorators, options.decorators);
 	      }
+
+	      container.hooks = {};
+
+	      var keepHelperInHelpers = options.allowCallsToHelperMissing || templateWasPrecompiledWithCompilerV7;
+	      _helpers.moveHelperToHooks(container, 'helperMissing', keepHelperInHelpers);
+	      _helpers.moveHelperToHooks(container, 'blockHelperMissing', keepHelperInHelpers);
 	    } else {
 	      container.helpers = options.helpers;
 	      container.partials = options.partials;
 	      container.decorators = options.decorators;
+	      container.hooks = options.hooks;
 	    }
 	  };
 
@@ -2579,7 +2612,7 @@ return /******/ (function(modules) { // webpackBootstrap
 	    return;
 	  }
 
-	  // We omit the last node if it's whitespace only and not preceeded by a non-content node.
+	  // We omit the last node if it's whitespace only and not preceded by a non-content node.
 	  var original = current.value;
 	  current.value = current.value.replace(multiple ? /\s+$/ : /[ \t]+$/, '');
 	  current.leftStripped = current.value !== original;
@@ -3571,13 +3604,19 @@ return /******/ (function(modules) { // webpackBootstrap
 	  // PUBLIC API: You can override these methods in a subclass to provide
 	  // alternative compiled forms for name lookup and buffering semantics
 	  nameLookup: function nameLookup(parent, name /* , type*/) {
+	    var isEnumerable = [this.aliasable('container.propertyIsEnumerable'), '.call(', parent, ',"constructor")'];
+
 	    if (name === 'constructor') {
-	      return ['(', parent, '.propertyIsEnumerable(\'constructor\') ? ', parent, '.constructor : undefined', ')'];
+	      return ['(', isEnumerable, '?', _actualLookup(), ' : undefined)'];
 	    }
-	    if (JavaScriptCompiler.isValidJavaScriptVariableName(name)) {
-	      return [parent, '.', name];
-	    } else {
-	      return [parent, '[', JSON.stringify(name), ']'];
+	    return _actualLookup();
+
+	    function _actualLookup() {
+	      if (JavaScriptCompiler.isValidJavaScriptVariableName(name)) {
+	        return [parent, '.', name];
+	      } else {
+	        return [parent, '[', JSON.stringify(name), ']'];
+	      }
 	    }
 	  },
 	  depthedLookup: function depthedLookup(name) {
@@ -3776,7 +3815,6 @@ return /******/ (function(modules) { // webpackBootstrap
 	    for (var alias in this.aliases) {
 	      // eslint-disable-line guard-for-in
 	      var node = this.aliases[alias];
-
 	      if (this.aliases.hasOwnProperty(alias) && node.children && node.referenceCount > 1) {
 	        varDeclarations += ', alias' + ++aliasCount + '=' + alias;
 	        node.children[0] = 'alias' + aliasCount;
@@ -3871,7 +3909,7 @@ return /******/ (function(modules) { // webpackBootstrap
 	  // replace it on the stack with the result of properly
 	  // invoking blockHelperMissing.
 	  blockValue: function blockValue(name) {
-	    var blockHelperMissing = this.aliasable('helpers.blockHelperMissing'),
+	    var blockHelperMissing = this.aliasable('container.hooks.blockHelperMissing'),
 	        params = [this.contextName(0)];
 	    this.setupHelperArgs(name, 0, params);
 
@@ -3889,7 +3927,7 @@ return /******/ (function(modules) { // webpackBootstrap
 	  // On stack, after, if lastHelper: value
 	  ambiguousBlockValue: function ambiguousBlockValue() {
 	    // We're being a bit cheeky and reusing the options value from the prior exec
-	    var blockHelperMissing = this.aliasable('helpers.blockHelperMissing'),
+	    var blockHelperMissing = this.aliasable('container.hooks.blockHelperMissing'),
 	        params = [this.contextName(0)];
 	    this.setupHelperArgs('', 0, params, true);
 
@@ -4180,18 +4218,33 @@ return /******/ (function(modules) { // webpackBootstrap
 	  // If the helper is not found, `helperMissing` is called.
 	  invokeHelper: function invokeHelper(paramSize, name, isSimple) {
 	    var nonHelper = this.popStack(),
-	        helper = this.setupHelper(paramSize, name),
-	        simple = isSimple ? [helper.name, ' || '] : '';
+	        helper = this.setupHelper(paramSize, name);
+
+	    var possibleFunctionCalls = [];
 
-	    var lookup = ['('].concat(simple, nonHelper);
+	    if (isSimple) {
+	      // direct call to helper
+	      possibleFunctionCalls.push(helper.name);
+	    }
+	    // call a function from the input object
+	    possibleFunctionCalls.push(nonHelper);
 	    if (!this.options.strict) {
-	      lookup.push(' || ', this.aliasable('helpers.helperMissing'));
+	      possibleFunctionCalls.push(this.aliasable('container.hooks.helperMissing'));
 	    }
-	    lookup.push(')');
 
-	    this.push(this.source.functionCall(lookup, 'call', helper.callParams));
+	    var functionLookupCode = ['(', this.itemsSeparatedBy(possibleFunctionCalls, '||'), ')'];
+	    var functionCall = this.source.functionCall(functionLookupCode, 'call', helper.callParams);
+	    this.push(functionCall);
 	  },
 
+	  itemsSeparatedBy: function itemsSeparatedBy(items, separator) {
+	    var result = [];
+	    result.push(items[0]);
+	    for (var i = 1; i < items.length; i++) {
+	      result.push(separator, items[i]);
+	    }
+	    return result;
+	  },
 	  // [invokeKnownHelper]
 	  //
 	  // On stack, before: hash, inverse, program, params..., ...
@@ -4229,7 +4282,7 @@ return /******/ (function(modules) { // webpackBootstrap
 	    var lookup = ['(', '(helper = ', helperName, ' || ', nonHelper, ')'];
 	    if (!this.options.strict) {
 	      lookup[0] = '(helper = ';
-	      lookup.push(' != null ? helper : ', this.aliasable('helpers.helperMissing'));
+	      lookup.push(' != null ? helper : ', this.aliasable('container.hooks.helperMissing'));
 	    }
 
 	    this.push(['(', lookup, helper.paramsInit ? ['),(', helper.paramsInit] : [], '),', '(typeof helper === ', this.aliasable('"function"'), ' ? ', this.source.functionCall('helper', 'call', helper.callParams), ' : helper))']);
diff --git a/src/BundleTransformer.Handlebars/readme.txt b/src/BundleTransformer.Handlebars/readme.txt
index fc99b4474..c13cab874 100644
--- a/src/BundleTransformer.Handlebars/readme.txt
+++ b/src/BundleTransformer.Handlebars/readme.txt
@@ -13,7 +13,7 @@
    ===========
    BundleTransformer.Handlebars contains one translator-adapter -
    `HandlebarsTranslator` (supports the Handlebars (http://handlebarsjs.com)
-   version 4.2.0). This adapter makes translation of Handlebars templates to JS
+   version 4.4.2). This adapter makes translation of Handlebars templates to JS
    code. Also contains the `HandlebarsAssetHandler` debugging HTTP handler, which
    is responsible for text output of translated Handlebars asset.
 
@@ -23,7 +23,7 @@
    =============
    RELEASE NOTES
    =============
-   Added support of Handlebars version 4.2.0.
+   Added support of the Handlebars version 4.4.2.
 
    ====================
    POST-INSTALL ACTIONS