diff --git a/build_web_compilers/CHANGELOG.md b/build_web_compilers/CHANGELOG.md
index c1dbcb2c6..44f3fdd4c 100644
--- a/build_web_compilers/CHANGELOG.md
+++ b/build_web_compilers/CHANGELOG.md
@@ -1,4 +1,19 @@
-## 4.0.4-wip
+## 4.0.4
+
+- Add the `canary` option for `build_web_compilers:ddc` and
+  `build_web_compilers:sdk_js`builders to enable canary features
+  in DDC. This setting is disabled by default but can be enabled
+  by setting it to `true` globally:
+
+```yaml
+global_options:
+  build_web_compilers:ddc:
+    options:
+      canary: true
+  build_web_compilers:sdk_js:
+    options:
+      canary: true
+```
 
 ## 4.0.3
 
diff --git a/build_web_compilers/lib/builders.dart b/build_web_compilers/lib/builders.dart
index adb15d029..590c5ce32 100644
--- a/build_web_compilers/lib/builders.dart
+++ b/build_web_compilers/lib/builders.dart
@@ -29,6 +29,7 @@ Builder ddcBuilder(BuilderOptions options) {
     useIncrementalCompiler: _readUseIncrementalCompilerOption(options),
     generateFullDill: _readGenerateFullDillOption(options),
     emitDebugSymbols: _readEmitDebugSymbolsOption(options),
+    canaryFeatures: _readCanaryOption(options),
     sdkKernelPath: sdkDdcKernelPath,
     trackUnusedInputs: _readTrackInputsCompilerOption(options),
     platform: ddcPlatform,
@@ -52,9 +53,11 @@ Builder ddcKernelBuilder(BuilderOptions options) {
 }
 
 Builder sdkJsCopyRequirejs(_) => SdkJsCopyBuilder();
-Builder sdkJsCompile(_) => SdkJsCompileBuilder(
-    sdkKernelPath: 'lib/_internal/ddc_platform.dill',
-    outputPath: 'lib/src/dev_compiler/dart_sdk.js');
+Builder sdkJsCompile(BuilderOptions options) => SdkJsCompileBuilder(
+      sdkKernelPath: 'lib/_internal/ddc_platform.dill',
+      outputPath: 'lib/src/dev_compiler/dart_sdk.js',
+      canaryFeatures: _readCanaryOption(options),
+    );
 
 // Dart2js related builders
 Builder dart2jsMetaModuleBuilder(BuilderOptions options) =>
@@ -102,6 +105,10 @@ bool _readEmitDebugSymbolsOption(BuilderOptions options) {
   return options.config[_emitDebugSymbolsOption] as bool? ?? false;
 }
 
+bool _readCanaryOption(BuilderOptions options) {
+  return options.config[_canaryOption] as bool? ?? false;
+}
+
 bool _readTrackInputsCompilerOption(BuilderOptions options) {
   return options.config[_trackUnusedInputsCompilerOption] as bool? ?? true;
 }
@@ -115,6 +122,7 @@ Map<String, dynamic>? _previousDdcConfig;
 const _useIncrementalCompilerOption = 'use-incremental-compiler';
 const _generateFullDillOption = 'generate-full-dill';
 const _emitDebugSymbolsOption = 'emit-debug-symbols';
+const _canaryOption = 'canary';
 const _trackUnusedInputsCompilerOption = 'track-unused-inputs';
 const _environmentOption = 'environment';
 
@@ -123,5 +131,6 @@ const _supportedOptions = [
   _useIncrementalCompilerOption,
   _generateFullDillOption,
   _emitDebugSymbolsOption,
+  _canaryOption,
   _trackUnusedInputsCompilerOption,
 ];
diff --git a/build_web_compilers/lib/src/dev_compiler_builder.dart b/build_web_compilers/lib/src/dev_compiler_builder.dart
index 303ec178a..3d6dc8f9d 100644
--- a/build_web_compilers/lib/src/dev_compiler_builder.dart
+++ b/build_web_compilers/lib/src/dev_compiler_builder.dart
@@ -47,6 +47,9 @@ class DevCompilerBuilder implements Builder {
   /// watch, expression evaluation, and variable inspection windows.
   final bool emitDebugSymbols;
 
+  /// Enables canary features in DDC.
+  final bool canaryFeatures;
+
   final bool trackUnusedInputs;
 
   final DartPlatform platform;
@@ -75,6 +78,7 @@ class DevCompilerBuilder implements Builder {
       {this.useIncrementalCompiler = true,
       this.generateFullDill = false,
       this.emitDebugSymbols = false,
+      this.canaryFeatures = false,
       this.trackUnusedInputs = false,
       required this.platform,
       String? sdkKernelPath,
@@ -124,6 +128,7 @@ class DevCompilerBuilder implements Builder {
           useIncrementalCompiler,
           generateFullDill,
           emitDebugSymbols,
+          canaryFeatures,
           trackUnusedInputs,
           platformSdk,
           sdkKernelPath,
@@ -144,6 +149,7 @@ Future<void> _createDevCompilerModule(
     bool useIncrementalCompiler,
     bool generateFullDill,
     bool emitDebugSymbols,
+    bool canaryFeatures,
     bool trackUnusedInputs,
     String dartSdk,
     String sdkKernelPath,
@@ -188,6 +194,7 @@ Future<void> _createDevCompilerModule(
       '--no-summarize',
       if (generateFullDill) '--experimental-output-compiled-kernel',
       if (emitDebugSymbols) '--emit-debug-symbols',
+      if (canaryFeatures) '--canary',
       '-o',
       jsOutputFile.path,
       debugMode ? '--source-map' : '--no-source-map',
diff --git a/build_web_compilers/lib/src/dev_compiler_stack_trace/stack_trace_mapper.dart.js b/build_web_compilers/lib/src/dev_compiler_stack_trace/stack_trace_mapper.dart.js
index 067122b62..89b7d6c80 100644
--- a/build_web_compilers/lib/src/dev_compiler_stack_trace/stack_trace_mapper.dart.js
+++ b/build_web_compilers/lib/src/dev_compiler_stack_trace/stack_trace_mapper.dart.js
@@ -1,28 +1,24 @@
 (function dartProgram(){function copyProperties(a,b){var s=Object.keys(a)
 for(var r=0;r<s.length;r++){var q=s[r]
-b[q]=a[q]}}function mixinProperties(a,b){var s=Object.keys(a)
+b[q]=a[q]}}function mixinPropertiesHard(a,b){var s=Object.keys(a)
 for(var r=0;r<s.length;r++){var q=s[r]
-if(!b.hasOwnProperty(q))b[q]=a[q]}}var z=function(){var s=function(){}
+if(!b.hasOwnProperty(q))b[q]=a[q]}}function mixinPropertiesEasy(a,b){Object.assign(b,a)}var z=function(){var s=function(){}
 s.prototype={p:{}}
 var r=new s()
-if(!(r.__proto__&&r.__proto__.p===s.prototype.p))return false
+if(!(Object.getPrototypeOf(r)&&Object.getPrototypeOf(r).p===s.prototype.p))return false
 try{if(typeof navigator!="undefined"&&typeof navigator.userAgent=="string"&&navigator.userAgent.indexOf("Chrome/")>=0)return true
 if(typeof version=="function"&&version.length==0){var q=version()
 if(/^\d+\.\d+\.\d+\.\d+$/.test(q))return true}}catch(p){}return false}()
-function setFunctionNamesIfNecessary(a){function t(){};if(typeof t.name=="string")return
-for(var s=0;s<a.length;s++){var r=a[s]
-var q=Object.keys(r)
-for(var p=0;p<q.length;p++){var o=q[p]
-var n=r[o]
-if(typeof n=="function")n.name=o}}}function inherit(a,b){a.prototype.constructor=a
+function inherit(a,b){a.prototype.constructor=a
 a.prototype["$i"+a.name]=a
-if(b!=null){if(z){a.prototype.__proto__=b.prototype
+if(b!=null){if(z){Object.setPrototypeOf(a.prototype,b.prototype)
 return}var s=Object.create(b.prototype)
 copyProperties(a.prototype,s)
-a.prototype=s}}function inheritMany(a,b){for(var s=0;s<b.length;s++)inherit(b[s],a)}function mixin(a,b){mixinProperties(b.prototype,a.prototype)
+a.prototype=s}}function inheritMany(a,b){for(var s=0;s<b.length;s++)inherit(b[s],a)}function mixinEasy(a,b){mixinPropertiesEasy(b.prototype,a.prototype)
+a.prototype.constructor=a}function mixinHard(a,b){mixinPropertiesHard(b.prototype,a.prototype)
 a.prototype.constructor=a}function lazyOld(a,b,c,d){var s=a
 a[b]=s
-a[c]=function(){a[c]=function(){H.l0(b)}
+a[c]=function(){a[c]=function(){A.lu(b)}
 var r
 var q=d
 try{if(a[b]===s){r=a[b]=q
@@ -34,17 +30,19 @@ a[c]=function(){return this[b]}
 return a[b]}}function lazyFinal(a,b,c,d){var s=a
 a[b]=s
 a[c]=function(){if(a[b]===s){var r=d()
-if(a[b]!==s)H.l1(b)
-a[b]=r}a[c]=function(){return this[b]}
-return a[b]}}function makeConstList(a){a.immutable$list=Array
+if(a[b]!==s)A.lv(b)
+a[b]=r}var q=a[b]
+a[c]=function(){return q}
+return q}}function makeConstList(a){a.immutable$list=Array
 a.fixed$length=Array
 return a}function convertToFastObject(a){function t(){}t.prototype=a
 new t()
 return a}function convertAllToFastObject(a){for(var s=0;s<a.length;++s)convertToFastObject(a[s])}var y=0
-function instanceTearOffGetter(a,b){var s=b.fs[0]
-if(a)return new Function("parameters, createTearOffClass, cache","return function tearOff_"+s+y+++"(receiver) {"+"if (cache === null) cache = createTearOffClass(parameters);"+"return new cache(this, receiver);"+"}")(b,H.fo,null)
-else return new Function("parameters, createTearOffClass, cache","return function tearOff_"+s+y+++"() {"+"if (cache === null) cache = createTearOffClass(parameters);"+"return new cache(this, null);"+"}")(b,H.fo,null)}function staticTearOffGetter(a){var s=null
-return function(){if(s===null)s=H.fo(a).prototype
+function instanceTearOffGetter(a,b){var s=null
+return a?function(c){if(s===null)s=A.fl(b)
+return new s(c,this)}:function(){if(s===null)s=A.fl(b)
+return new s(this,null)}}function staticTearOffGetter(a){var s=null
+return function(){if(s===null)s=A.fl(a).prototype
 return s}}var x=0
 function tearOffParameters(a,b,c,d,e,f,g,h,i,j){if(typeof h=="number")h+=x
 return{co:a,iS:b,iI:c,rC:d,dV:e,cs:f,fs:g,fT:h,aI:i||0,nDA:j}}function installStaticTearOff(a,b,c,d,e,f,g,h){var s=tearOffParameters(a,true,false,c,d,e,f,g,h,false)
@@ -61,162 +59,93 @@ var r=s.length
 s.push.apply(s,a)
 return r}function updateHolder(a,b){copyProperties(b,a)
 return a}var hunkHelpers=function(){var s=function(a,b,c,d,e){return function(f,g,h,i){return installInstanceTearOff(f,g,a,b,c,d,[h],i,e,false)}},r=function(a,b,c,d){return function(e,f,g,h){return installStaticTearOff(e,f,a,b,c,[g],h,d)}}
-return{inherit:inherit,inheritMany:inheritMany,mixin:mixin,installStaticTearOff:installStaticTearOff,installInstanceTearOff:installInstanceTearOff,_instance_0u:s(0,0,null,["$0"],0),_instance_1u:s(0,1,null,["$1"],0),_instance_2u:s(0,2,null,["$2"],0),_instance_0i:s(1,0,null,["$0"],0),_instance_1i:s(1,1,null,["$1"],0),_instance_2i:s(1,2,null,["$2"],0),_static_0:r(0,null,["$0"],0),_static_1:r(1,null,["$1"],0),_static_2:r(2,null,["$2"],0),makeConstList:makeConstList,lazy:lazy,lazyFinal:lazyFinal,lazyOld:lazyOld,updateHolder:updateHolder,convertToFastObject:convertToFastObject,setFunctionNamesIfNecessary:setFunctionNamesIfNecessary,updateTypes:updateTypes,setOrUpdateInterceptorsByTag:setOrUpdateInterceptorsByTag,setOrUpdateLeafTags:setOrUpdateLeafTags}}()
+return{inherit:inherit,inheritMany:inheritMany,mixin:mixinEasy,mixinHard:mixinHard,installStaticTearOff:installStaticTearOff,installInstanceTearOff:installInstanceTearOff,_instance_0u:s(0,0,null,["$0"],0),_instance_1u:s(0,1,null,["$1"],0),_instance_2u:s(0,2,null,["$2"],0),_instance_0i:s(1,0,null,["$0"],0),_instance_1i:s(1,1,null,["$1"],0),_instance_2i:s(1,2,null,["$2"],0),_static_0:r(0,null,["$0"],0),_static_1:r(1,null,["$1"],0),_static_2:r(2,null,["$2"],0),makeConstList:makeConstList,lazy:lazy,lazyFinal:lazyFinal,lazyOld:lazyOld,updateHolder:updateHolder,convertToFastObject:convertToFastObject,updateTypes:updateTypes,setOrUpdateInterceptorsByTag:setOrUpdateInterceptorsByTag,setOrUpdateLeafTags:setOrUpdateLeafTags}}()
 function initializeDeferredHunk(a){x=v.types.length
-a(hunkHelpers,v,w,$)}var A={
-fL:function(a){return A.c6(a,new A.dA(a))},
-fK:function(a){return A.c6(a,new A.dy(a))},
-j2:function(a){return A.c6(a,new A.dv(a))},
-j3:function(a){return A.c6(a,new A.dw(a))},
-j4:function(a){return A.c6(a,new A.dx(a))},
-f2:function(a){if(C.a.A(a,$.i5()))return P.H(a)
-else if(C.a.A(a,$.i6()))return P.hn(a,!0)
-else if(C.a.t(a,"/"))return P.hn(a,!1)
-if(C.a.A(a,"\\"))return $.iF().bQ(a)
-return P.H(a)},
-c6:function(a,b){var s,r
-try{s=b.$0()
-return s}catch(r){if(H.ad(r) instanceof P.aL)return new N.X(P.B(null,"unparsed",null,null),a)
-else throw r}},
-x:function x(a,b,c,d){var _=this
-_.a=a
-_.b=b
-_.c=c
-_.d=d},
-dA:function dA(a){this.a=a},
-dy:function dy(a){this.a=a},
-dz:function dz(a){this.a=a},
-dv:function dv(a){this.a=a},
-dw:function dw(a){this.a=a},
-dx:function dx(a){this.a=a},
-fO:function(a,b){return A.j7(a,b,b)},
-j7:function(a,b,c){return P.kr(function(){var s=a,r=b
-var q=0,p=1,o,n,m,l
-return function $async$fO(d,e){if(d===1){o=e
-q=p}while(true)switch(q){case 0:n=new H.ah(s,s.gl(s)),m=H.l(n).c
-case 2:if(!n.m()){q=3
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-q=l!=null?4:5
-break
-case 4:q=6
-return l
-case 6:case 5:q=2
-break
-case 3:return P.jA()
-case 1:return P.jB(o)}}},c)}},B={av:function av(){},
-hW:function(a){var s
-if(!(a>=65&&a<=90))s=a>=97&&a<=122
-else s=!0
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-hX:function(a,b){var s=a.length,r=b+2
-if(s<r)return!1
-if(!B.hW(C.a.n(a,b)))return!1
-if(C.a.n(a,b+1)!==58)return!1
-if(s===r)return!0
-return C.a.n(a,r)===47}},C={},D={
-kG:function(a){var s=a.$ti.i("i<p.E,e>")
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-eM:function eM(){},
-dt:function dt(){},
-ck:function ck(a,b){this.a=a
-this.b=b},
-eV:function eV(){},
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-try{o=P.f9()}catch(s){if(t.M.b(H.ad(s))){r=$.eE
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-return new H.ar(a,b.i("@<0>").R(c).i("ar<1,2>"))},
-cj:function(a){return new H.ci("Field '"+a+"' has been assigned during initialization.")},
-eN:function(a){var s,r=a^48
+a(hunkHelpers,v,w,$)}var A={eZ:function eZ(){},
+eU(a,b,c){if(b.i("h<0>").b(a))return new A.bD(a,b.i("@<0>").H(c).i("bD<1,2>"))
+return new A.ar(a,b.i("@<0>").H(c).i("ar<1,2>"))},
+eG(a){var s,r=a^48
 if(r<=9)return r
 s=a|32
 if(97<=s&&s<=102)return s-87
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-aP:function(a,b,c,d){P.Q(b,"start")
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-return new H.a7(a,b,c.i("a7<0>"))},
-c9:function(){return new P.aB("No element")},
-j6:function(){return new P.aB("Too few elements")},
-am:function am(){},
-bZ:function bZ(a,b){this.a=a
+cH(a,b){a=a+b&536870911
+a=a+((a&524287)<<10)&536870911
+return a^a>>>6},
+h9(a){a=a+((a&67108863)<<3)&536870911
+a^=a>>>11
+return a+((a&16383)<<15)&536870911},
+fr(a){var s,r
+for(s=$.aI.length,r=0;r<s;++r)if(a===$.aI[r])return!0
+return!1},
+aQ(a,b,c,d){A.T(b,"start")
+if(c!=null){A.T(c,"end")
+if(b>c)A.z(A.u(b,0,c,"start",null))}return new A.aC(a,b,c,d.i("aC<0>"))},
+cm(a,b,c,d){if(t.X.b(a))return new A.ba(a,b,c.i("@<0>").H(d).i("ba<1,2>"))
+return new A.P(a,b,c.i("@<0>").H(d).i("P<1,2>"))},
+jE(a,b,c){var s="takeCount"
+A.aK(b,s)
+A.T(b,s)
+if(t.X.b(a))return new A.bb(a,b,c.i("bb<0>"))
+return new A.aD(a,b,c.i("aD<0>"))},
+jB(a,b,c){var s="count"
+if(t.X.b(a)){A.aK(b,s)
+A.T(b,s)
+return new A.aM(a,b,c.i("aM<0>"))}A.aK(b,s)
+A.T(b,s)
+return new A.a9(a,b,c.i("a9<0>"))},
+ca(){return new A.aB("No element")},
+jl(){return new A.aB("Too few elements")},
+ao:function ao(){},
+c1:function c1(a,b){this.a=a
 this.$ti=b},
 ar:function ar(a,b){this.a=a
 this.$ti=b},
-bB:function bB(a,b){this.a=a
+bD:function bD(a,b){this.a=a
+this.$ti=b},
+bC:function bC(){},
+a4:function a4(a,b){this.a=a
 this.$ti=b},
-bA:function bA(){},
-a1:function a1(a,b){this.a=a
+as:function as(a,b){this.a=a
 this.$ti=b},
-ci:function ci(a){this.a=a},
-aJ:function aJ(a){this.a=a},
+dc:function dc(a,b){this.a=a
+this.b=b},
+bk:function bk(a){this.a=a},
+aL:function aL(a){this.a=a},
+dM:function dM(){},
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-F:function F(){},
+H:function H(){},
 aC:function aC(a,b,c,d){var _=this
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-ah:function ah(a,b){var _=this
+a7:function a7(a,b){var _=this
 _.a=a
 _.b=b
 _.c=0
 _.d=null},
-L:function L(a,b,c){this.a=a
+P:function P(a,b,c){this.a=a
 this.b=b
 this.$ti=c},
-b8:function b8(a,b,c){this.a=a
+ba:function ba(a,b,c){this.a=a
 this.b=b
 this.$ti=c},
-bj:function bj(a,b){this.a=null
+bm:function bm(a,b){this.a=null
 this.b=a
 this.c=b},
-i:function i(a,b,c){this.a=a
+j:function j(a,b,c){this.a=a
 this.b=b
 this.$ti=c},
-E:function E(a,b,c){this.a=a
+D:function D(a,b,c){this.a=a
 this.b=b
 this.$ti=c},
-by:function by(a,b){this.a=a
+bA:function bA(a,b){this.a=a
 this.b=b},
-bc:function bc(a,b,c){this.a=a
+be:function be(a,b,c){this.a=a
 this.b=b
 this.$ti=c},
-c4:function c4(a,b,c){var _=this
+c6:function c6(a,b,c){var _=this
 _.a=a
 _.b=b
 _.c=c
@@ -224,259 +153,260 @@ _.d=null},
 aD:function aD(a,b,c){this.a=a
 this.b=b
 this.$ti=c},
-b9:function b9(a,b,c){this.a=a
+bb:function bb(a,b,c){this.a=a
 this.b=b
 this.$ti=c},
-cJ:function cJ(a,b){this.a=a
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+if(q==null)q=r.a(q)
+if(B.a.t(q,A.l('["*/:<>?\\\\|]',!1)))if(b)throw A.a(A.G("Illegal character in path"))
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+if(b)throw A.a(A.G(r+A.h7(a)))
+else throw A.a(A.q(r+A.h7(a)))},
+ki(a,b){var s=null,r=A.b(a.split("/"),t.s)
+if(B.a.p(a,"/"))return A.x(s,s,r,"file")
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+kj(a,b){var s,r,q,p,o="\\",n=null,m="file"
+if(B.a.p(a,"\\\\?\\"))if(B.a.u(a,"UNC\\",4))a=B.a.Y(a,0,7,o)
+else{a=B.a.A(a,4)
+if(a.length<3||a.charCodeAt(1)!==58||a.charCodeAt(2)!==92)throw A.a(A.bV(a,"path","Windows paths with \\\\?\\ prefix must be absolute"))}else a=A.R(a,"/",o)
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-if(s===2||C.a.k(a,2)!==92)throw H.a(P.A("Windows paths with drive letter must be absolute"))
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-return P.B(n,n,r,m)}if(C.a.t(a,o))if(C.a.B(a,o,1)){q=C.a.a4(a,o,2)
+if(s>1&&a.charCodeAt(1)===58){A.hu(a.charCodeAt(0),!0)
+if(s===2||a.charCodeAt(2)!==92)throw A.a(A.bV(a,"path","Windows paths with drive letter must be absolute"))
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-P.bL(r,!0,0)
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-P.bL(r,!0,0)
-return P.B(n,n,r,n)}},
-ff:function(a,b){if(a!=null&&a===P.hp(b))return null
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+r=A.b((s?"":B.a.A(a,q+1)).split(o),t.s)
+A.bN(r,!0,0)
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+A.bN(r,!0,0)
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-if(C.a.n(a,b)===91){s=c-1
-if(C.a.n(a,s)!==93)P.aZ(a,b,"Missing end `]` to match `[` in host")
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+o=A.hG(a,B.a.u(a,"25",p)?q+3:p,s,"%25")}else o=""
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-return"["+C.a.j(a,b,q)+o+"]"}return P.k0(a,b,c)},
-jV:function(a,b,c){var s=C.a.a4(a,"%",b)
+o=A.hG(a,B.a.u(a,"25",p)?q+3:p,c,"%25")}else o=""
+A.hg(a,b,q)
+return"["+B.a.j(a,b,q)+o+"]"}return A.kl(a,b,c)},
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-for(s=b,r=s,q=!0;s<c;){p=C.a.n(a,s)
-if(p===37){o=P.fg(a,s,!0)
+hG(a,b,c,d){var s,r,q,p,o,n,m,l,k,j,i=d!==""?new A.w(d):null
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-if(n)o=C.a.j(a,s,s+3)
-else if(o==="%")P.aZ(a,s,"ZoneID should not contain % anymore")
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+m=i.a+=B.a.j(a,r,s)
+if(n)o=B.a.j(a,s,s+3)
+else if(o==="%")A.b_(a,s,"ZoneID should not contain % anymore")
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-j=C.a.j(a,r,s)
-if(i==null){i=new P.w("")
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-for(s=b,r=s,q=null,p=!0;s<c;){o=C.a.n(a,s)
-if(o===37){n=P.fg(a,s,!0)
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-if(m){n=C.a.j(a,s,s+3)
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-l=C.a.j(a,r,s)
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-if(q==null){q=new P.w("")
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-return P.jT(r?a.toLowerCase():a)},
-jT:function(a){if(a==="http")return"http"
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+for(s=b,r=!1;s<c;++s){q=a.charCodeAt(s)
+if(!(q<128&&(B.x[q>>>4]&1<<(q&15))!==0))A.b_(a,s,"Illegal scheme character")
+if(65<=q&&q<=90)r=!0}a=B.a.j(a,b,c)
+return A.ke(r?a.toLowerCase():a)},
+ke(a){if(a==="http")return"http"
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-hx:function(a,b,c){if(a==null)return""
-return P.bM(a,b,c,C.W,!1)},
-hu:function(a,b,c,d,e,f){var s,r=e==="file",q=r||f
+hD(a,b,c){if(a==null)return""
+return A.bO(a,b,c,B.W,!1,!1)},
+hA(a,b,c,d,e,f){var s,r=e==="file",q=r||f
 if(a==null){if(d==null)return r?"/":""
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-if(s.length===0){if(r)return"/"}else if(q&&!C.a.t(s,"/"))s="/"+s
-return P.k_(s,e,f)},
-k_:function(a,b,c){var s=b.length===0
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-return P.a9(a)},
-hv:function(a,b,c,d){if(a!=null)return P.bM(a,b,c,C.h,!0)
+s=new A.j(d,new A.eo(),A.y(d).i("j<1,e>")).a0(0,"/")}else if(d!=null)throw A.a(A.G("Both path and pathSegments specified"))
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+if(s.length===0){if(r)return"/"}else if(q&&!B.a.p(s,"/"))s="/"+s
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+kk(a,b,c){var s=b.length===0
+if(s&&!c&&!B.a.p(a,"/")&&!B.a.p(a,"\\"))return A.fd(a,!s||c)
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-return P.bM(a,b,c,C.h,!0)},
-fg:function(a,b,c){var s,r,q,p,o,n=b+2
+hy(a,b,c){if(a==null)return null
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 if(n>=a.length)return"%"
-s=C.a.n(a,b+1)
-r=C.a.n(a,n)
-q=H.eN(s)
-p=H.eN(r)
+s=a.charCodeAt(b+1)
+r=a.charCodeAt(n)
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-if(o<127&&(C.z[C.c.a6(o,4)]&1<<(o&15))!==0)return H.G(c&&65<=o&&90>=o?(o|32)>>>0:o)
-if(s>=97||r>=97)return C.a.j(a,b,b+3).toUpperCase()
+if(o<127&&(B.w[B.c.a7(o,4)]&1<<(o&15))!==0)return A.J(c&&65<=o&&90>=o?(o|32)>>>0:o)
+if(s>=97||r>=97)return B.a.j(a,b,b+3).toUpperCase()
 return null},
-fe:function(a){var s,r,q,p,o,n="0123456789ABCDEF"
+fa(a){var s,r,q,p,o,n="0123456789ABCDEF"
 if(a<128){s=new Uint8Array(3)
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-s[1]=C.a.k(n,a>>>4)
-s[2]=C.a.k(n,a&15)}else{if(a>2047)if(a>65535){r=240
+s[1]=n.charCodeAt(a>>>4)
+s[2]=n.charCodeAt(a&15)}else{if(a>2047)if(a>65535){r=240
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 q=3}else{r=192
 q=2}s=new Uint8Array(3*q)
-for(p=0;--q,q>=0;r=128){o=C.c.ck(a,6*q)&63|r
+for(p=0;--q,q>=0;r=128){o=B.c.ck(a,6*q)&63|r
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-s[p+1]=C.a.k(n,o>>>4)
-s[p+2]=C.a.k(n,o&15)
-p+=3}}return P.h5(s,0,null)},
-bM:function(a,b,c,d,e){var s=P.hz(a,b,c,d,e)
-return s==null?C.a.j(a,b,c):s},
-hz:function(a,b,c,d,e){var s,r,q,p,o,n,m,l,k,j=null
-for(s=!e,r=b,q=r,p=j;r<c;){o=C.a.n(a,r)
+s[p+1]=n.charCodeAt(o>>>4)
+s[p+2]=n.charCodeAt(o&15)
+p+=3}}return A.h8(s,0,null)},
+bO(a,b,c,d,e,f){var s=A.hF(a,b,c,d,e,f)
+return s==null?B.a.j(a,b,c):s},
+hF(a,b,c,d,e,f){var s,r,q,p,o,n,m,l,k,j,i=null
+for(s=!e,r=b,q=r,p=i;r<c;){o=a.charCodeAt(r)
 if(o<127&&(d[o>>>4]&1<<(o&15))!==0)++r
-else{if(o===37){n=P.fg(a,r,!1)
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-m=1}else m=3}else if(s&&o<=93&&(C.v[o>>>4]&1<<(o&15))!==0){P.aZ(a,r,"Invalid character")
-m=j
+m=1}else m=3}else if(o===92&&f){n="/"
+m=1}else if(s&&o<=93&&(B.z[o>>>4]&1<<(o&15))!==0){A.b_(a,r,"Invalid character")
+m=i
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-if(l<c){k=C.a.n(a,l)
+if(l<c){k=a.charCodeAt(l)
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-n=P.fe(o)}if(p==null){p=new P.w("")
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-l.a+=C.a.j(a,q,r)
-l.a+=H.d(n)
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+l.a=j+A.d(n)
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-q=r}}if(p==null)return j
-if(q<c)p.a+=C.a.j(a,q,c)
+q=r}}if(p==null)return i
+if(q<c)p.a+=B.a.j(a,q,c)
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-hy:function(a){if(C.a.t(a,"."))return!0
-return C.a.ar(a,"/.")!==-1},
-a9:function(a){var s,r,q,p,o,n
-if(!P.hy(a))return a
-s=H.b([],t.s)
+hE(a){if(B.a.p(a,"."))return!0
+return B.a.au(a,"/.")!==-1},
+ac(a){var s,r,q,p,o,n
+if(!A.hE(a))return a
+s=A.b([],t.s)
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-if(J.J(n,"..")){if(s.length!==0){s.pop()
+if(J.A(n,"..")){if(s.length!==0){s.pop()
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-return C.b.Z(s,"/")},
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-if((q&s)!==0)throw H.a(P.f0(a,"string","Contains invalid characters."))
+return s}catch(r){}return null}}
+A.bW.prototype={
+cw(a){return B.F.ap(a)}}
+A.d3.prototype={
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-a2=P.a6(a1,a2,a0.length)
-s=$.il()
+A.bX.prototype={}
+A.c_.prototype={
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-if(f>=0){g=C.a.n(u.n,f)
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-continue}}throw H.a(P.m("Invalid base64 data",a0,r))}if(p!=null){e=p.a+=C.a.j(a0,q,a2)
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-else{c=C.c.aP(d-1,4)+1
-if(c===1)throw H.a(P.m(a,a0,a2))
+if(o>=0)A.fG(a0,n,a2,o,m,d)
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+if(c===1)throw A.a(A.n(a,a0,a2))
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-P.ae.prototype={}
-P.Z.prototype={}
-P.c3.prototype={}
-P.bf.prototype={
-h:function(a){var s=P.au(this.a)
+return B.a.Y(a0,a1,a2,e.charCodeAt(0)==0?e:e)}b=a2-a1
+if(o>=0)A.fG(a0,n,a2,o,m,b)
+else{c=B.c.aT(b,4)
+if(c===1)throw A.a(A.n(a,a0,a2))
+if(c>1)a0=B.a.Y(a0,a2,a2,c===2?"==":"=")}return a0}}
+A.c0.prototype={}
+A.ah.prototype={}
+A.a_.prototype={}
+A.c5.prototype={}
+A.bj.prototype={
+h(a){var s=A.av(this.a)
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-P.cf.prototype={
-h:function(a){return"Cyclic error in JSON stringify"}}
-P.ce.prototype={
-bA:function(a,b){var s=P.ks(a,this.gcs().a)
+A.cg.prototype={
+h(a){return"Cyclic error in JSON stringify"}}
+A.cf.prototype={
+bD(a,b){var s=A.kO(a,this.gcu().a)
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-cv:function(a,b){var s=P.jD(a,this.gb1().b,null)
+cz(a,b){var s=A.jV(a,this.gb4().b,null)
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-gb1:function(){return C.T},
-gcs:function(){return C.S}}
-P.ch.prototype={}
-P.cg.prototype={}
-P.eq.prototype={
-bU:function(a){var s,r,q,p,o,n=this,m=a.length
-for(s=0,r=0;r<m;++r){q=C.a.k(a,r)
+gb4(){return B.V},
+gcu(){return B.U}}
+A.ci.prototype={}
+A.ch.prototype={}
+A.eg.prototype={
+bV(a){var s,r,q,p,o,n=this,m=a.length
+for(s=0,r=0;r<m;++r){q=a.charCodeAt(r)
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-o=!(o<m&&(C.a.k(a,o)&64512)===56320)}else o=!1
+o=!(o<m&&(a.charCodeAt(o)&64512)===56320)}else o=!1
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-p=!(p>=0&&(C.a.n(a,p)&64512)===55296)}else p=!1
+p=!(p>=0&&(a.charCodeAt(p)&64512)===55296)}else p=!1
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-if(p){if(r>s)n.aO(a,s,r)
+if(p){if(r>s)n.aS(a,s,r)
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-n.H(92)
-n.H(117)
-n.H(100)
+n.I(92)
+n.I(117)
+n.I(100)
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-n.H(p<10?48+p:87+p)
+n.I(p<10?48+p:87+p)
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-n.H(p<10?48+p:87+p)
+n.I(p<10?48+p:87+p)
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-n.H(p<10?48+p:87+p)}}continue}if(q<32){if(r>s)n.aO(a,s,r)
+n.I(p<10?48+p:87+p)}}continue}if(q<32){if(r>s)n.aS(a,s,r)
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-n.H(92)
-switch(q){case 8:n.H(98)
+n.I(92)
+switch(q){case 8:n.I(98)
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-case 9:n.H(116)
+case 9:n.I(116)
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-case 10:n.H(110)
+case 10:n.I(110)
 break
-case 12:n.H(102)
+case 12:n.I(102)
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-case 13:n.H(114)
+case 13:n.I(114)
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-default:n.H(117)
-n.H(48)
-n.H(48)
+default:n.I(117)
+n.I(48)
+n.I(48)
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-n.H(p<10?48+p:87+p)
+n.I(p<10?48+p:87+p)
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-n.H(p<10?48+p:87+p)
-break}}else if(q===34||q===92){if(r>s)n.aO(a,s,r)
+n.I(p<10?48+p:87+p)
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-n.H(q)}}if(s===0)n.O(a)
-else if(s<m)n.aO(a,s,m)},
-aQ:function(a){var s,r,q,p
+n.I(92)
+n.I(q)}}if(s===0)n.P(a)
+else if(s<m)n.aS(a,s,m)},
+aU(a){var s,r,q,p
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-if(a==null?p==null:a===p)throw H.a(new P.cf(a,null))}s.push(a)},
-aN:function(a){var s,r,q,p,o=this
-if(o.bT(a))return
-o.aQ(a)
+if(a==null?p==null:a===p)throw A.a(new A.cg(a,null))}s.push(a)},
+aR(a){var s,r,q,p,o=this
+if(o.bU(a))return
+o.aU(a)
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-if(!o.bT(s)){q=P.fT(a,null,o.gbu())
-throw H.a(q)}o.a.pop()}catch(p){r=H.ad(p)
-q=P.fT(a,r,o.gbu())
-throw H.a(q)}},
-bT:function(a){var s,r=this
+if(!o.bU(s)){q=A.fU(a,null,o.gbx())
+throw A.a(q)}o.a.pop()}catch(p){r=A.b2(p)
+q=A.fU(a,r,o.gbx())
+throw A.a(q)}},
+bU(a){var s,r=this
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-r.cM(a)
-return!0}else if(a===!0){r.O("true")
-return!0}else if(a===!1){r.O("false")
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-r.bU(a)
-r.O('"')
-return!0}else if(t.j.b(a)){r.aQ(a)
-r.cK(a)
+r.cR(a)
+return!0}else if(a===!0){r.P("true")
+return!0}else if(a===!1){r.P("false")
+return!0}else if(a==null){r.P("null")
+return!0}else if(typeof a=="string"){r.P('"')
+r.bV(a)
+r.P('"')
+return!0}else if(t.j.b(a)){r.aU(a)
+r.cP(a)
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-return!0}else if(t.f.b(a)){r.aQ(a)
-s=r.cL(a)
+return!0}else if(t.f.b(a)){r.aU(a)
+s=r.cQ(a)
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-cK:function(a){var s,r,q=this
-q.O("[")
-s=J.S(a)
-if(s.gas(a)){q.aN(s.q(a,0))
-for(r=1;r<s.gl(a);++r){q.O(",")
-q.aN(s.q(a,r))}}q.O("]")},
-cL:function(a){var s,r,q,p,o=this,n={}
-if(a.gG(a)){o.O("{}")
-return!0}s=a.gl(a)*2
-r=P.a_(s,null,!1,t.O)
+cP(a){var s,r,q=this
+q.P("[")
+s=J.Z(a)
+if(s.gaf(a)){q.aR(s.n(a,0))
+for(r=1;r<s.gk(a);++r){q.P(",")
+q.aR(s.n(a,r))}}q.P("]")},
+cQ(a){var s,r,q,p,o=this,n={}
+if(a.gC(a)){o.P("{}")
+return!0}s=a.gk(a)*2
+r=A.a0(s,null,!1,t.O)
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 n.b=!0
-a.T(0,new P.er(n,r))
+a.O(0,new A.eh(n,r))
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-o.O("{")
-for(p='"';q<s;q+=2,p=',"'){o.O(p)
-o.bU(H.k5(r[q]))
-o.O('":')
-o.aN(r[q+1])}o.O("}")
+o.P("{")
+for(p='"';q<s;q+=2,p=',"'){o.P(p)
+o.bV(A.hM(r[q]))
+o.P('":')
+o.aR(r[q+1])}o.P("}")
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-P.er.prototype={
-$2:function(a,b){var s,r,q,p
+A.eh.prototype={
+$2(a,b){var s,r,q,p
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 s=this.b
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@@ -3790,31 +3946,31 @@ p=r.a=q+1
 s[q]=a
 r.a=p+1
 s[p]=b}}
-P.ep.prototype={
-gbu:function(){var s=this.c.a
+A.ef.prototype={
+gbx(){var s=this.c.a
 return s.charCodeAt(0)==0?s:s},
-cM:function(a){this.c.a+=C.Q.h(a)},
-O:function(a){this.c.a+=a},
-aO:function(a,b,c){this.c.a+=C.a.j(a,b,c)},
-H:function(a){this.c.a+=H.G(a)}}
-P.cR.prototype={
-gb1:function(){return C.O}}
-P.cT.prototype={
-ao:function(a){var s,r,q,p=P.a6(0,null,a.length),o=p-0
+cR(a){this.c.a+=B.R.h(a)},
+P(a){this.c.a+=a},
+aS(a,b,c){this.c.a+=B.a.j(a,b,c)},
+I(a){this.c.a+=A.J(a)}}
+A.cP.prototype={
+gb4(){return B.P}}
+A.cR.prototype={
+ap(a){var s,r,q,p=A.a1(0,null,a.length),o=p-0
 if(o===0)return new Uint8Array(0)
 s=o*3
 r=new Uint8Array(s)
-q=new P.ey(r)
-if(q.cc(a,0,p)!==p){C.a.n(a,p-1)
-q.aZ()}return new Uint8Array(r.subarray(0,H.k8(0,q.b,s)))}}
-P.ey.prototype={
-aZ:function(){var s=this,r=s.c,q=s.b,p=s.b=q+1
+q=new A.eq(r)
+if(q.cb(a,0,p)!==p)q.b1()
+return new Uint8Array(r.subarray(0,A.kt(0,q.b,s)))}}
+A.eq.prototype={
+b1(){var s=this,r=s.c,q=s.b,p=s.b=q+1
 r[q]=239
 q=s.b=p+1
 r[p]=191
 s.b=q+1
 r[q]=189},
-cp:function(a,b){var s,r,q,p,o=this
+cp(a,b){var s,r,q,p,o=this
 if((b&64512)===56320){s=65536+((a&1023)<<10)|b&1023
 r=o.c
 q=o.b
@@ -3826,19 +3982,19 @@ p=o.b=q+1
 r[q]=s>>>6&63|128
 o.b=p+1
 r[p]=s&63|128
-return!0}else{o.aZ()
+return!0}else{o.b1()
 return!1}},
-cc:function(a,b,c){var s,r,q,p,o,n,m,l=this
-if(b!==c&&(C.a.n(a,c-1)&64512)===55296)--c
-for(s=l.c,r=s.length,q=b;q<c;++q){p=C.a.k(a,q)
+cb(a,b,c){var s,r,q,p,o,n,m,l=this
+if(b!==c&&(a.charCodeAt(c-1)&64512)===55296)--c
+for(s=l.c,r=s.length,q=b;q<c;++q){p=a.charCodeAt(q)
 if(p<=127){o=l.b
 if(o>=r)break
 l.b=o+1
 s[o]=p}else{o=p&64512
 if(o===55296){if(l.b+4>r)break
 n=q+1
-if(l.cp(p,C.a.k(a,n)))q=n}else if(o===56320){if(l.b+3>r)break
-l.aZ()}else if(p<=2047){o=l.b
+if(l.cp(p,a.charCodeAt(n)))q=n}else if(o===56320){if(l.b+3>r)break
+l.b1()}else if(p<=2047){o=l.b
 m=o+1
 if(m>=r)break
 l.b=m
@@ -3852,39 +4008,39 @@ o=l.b=m+1
 s[m]=p>>>6&63|128
 l.b=o+1
 s[o]=p&63|128}}}return q}}
-P.cS.prototype={
-ao:function(a){var s=this.a,r=P.jy(s,a,0,null)
+A.cQ.prototype={
+ap(a){var s=this.a,r=A.jS(s,a,0,null)
 if(r!=null)return r
-return new P.ex(s).cq(a,0,null,!0)}}
-P.ex.prototype={
-cq:function(a,b,c,d){var s,r,q,p,o,n=this,m=P.a6(b,c,J.D(a))
+return new A.ep(s).cs(a,0,null,!0)}}
+A.ep.prototype={
+cs(a,b,c,d){var s,r,q,p,o,n=this,m=A.a1(b,c,J.F(a))
 if(b===m)return""
-if(t.n.b(a)){s=a
-r=0}else{s=P.k2(a,b,m)
+if(t.x.b(a)){s=a
+r=0}else{s=A.kn(a,b,m)
 m-=b
 r=b
-b=0}q=n.aR(s,b,m,!0)
+b=0}q=n.aV(s,b,m,!0)
 p=n.b
-if((p&1)!==0){o=P.k3(p)
+if((p&1)!==0){o=A.ko(p)
 n.b=0
-throw H.a(P.m(o,a,r+n.c))}return q},
-aR:function(a,b,c,d){var s,r,q=this
-if(c-b>1000){s=C.c.bw(b+c,2)
-r=q.aR(a,b,s,!1)
+throw A.a(A.n(o,a,r+n.c))}return q},
+aV(a,b,c,d){var s,r,q=this
+if(c-b>1000){s=B.c.bz(b+c,2)
+r=q.aV(a,b,s,!1)
 if((q.b&1)!==0)return r
-return r+q.aR(a,s,c,d)}return q.cr(a,b,c,d)},
-cr:function(a,b,c,d){var s,r,q,p,o,n,m,l=this,k=65533,j=l.b,i=l.c,h=new P.w(""),g=b+1,f=a[b]
-$label0$0:for(s=l.a;!0;){for(;!0;g=p){r=C.a.k("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAFFFFFFFFFFFFFFFFGGGGGGGGGGGGGGGGHHHHHHHHHHHHHHHHHHHHHHHHHHHIHHHJEEBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBKCCCCCCCCCCCCDCLONNNMEEEEEEEEEEE",f)&31
+return r+q.aV(a,s,c,d)}return q.ct(a,b,c,d)},
+ct(a,b,c,d){var s,r,q,p,o,n,m,l=this,k=65533,j=l.b,i=l.c,h=new A.w(""),g=b+1,f=a[b]
+$label0$0:for(s=l.a;!0;){for(;!0;g=p){r="AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAFFFFFFFFFFFFFFFFGGGGGGGGGGGGGGGGHHHHHHHHHHHHHHHHHHHHHHHHHHHIHHHJEEBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBKCCCCCCCCCCCCDCLONNNMEEEEEEEEEEE".charCodeAt(f)&31
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-j=C.a.k(" \x000:XECCCCCN:lDb \x000:XECCCCCNvlDb \x000:XECCCCCN:lDb AAAAA\x00\x00\x00\x00\x00AAAAA00000AAAAA:::::AAAAAGG000AAAAA00KKKAAAAAG::::AAAAA:IIIIAAAAA000\x800AAAAA\x00\x00\x00\x00 AAAAA",j+r)
-if(j===0){h.a+=H.G(i)
+j=" \x000:XECCCCCN:lDb \x000:XECCCCCNvlDb \x000:XECCCCCN:lDb AAAAA\x00\x00\x00\x00\x00AAAAA00000AAAAA:::::AAAAAGG000AAAAA00KKKAAAAAG::::AAAAA:IIIIAAAAA000\x800AAAAA\x00\x00\x00\x00 AAAAA".charCodeAt(j+r)
+if(j===0){h.a+=A.J(i)
 if(g===c)break $label0$0
-break}else if((j&1)!==0){if(s)switch(j){case 69:case 67:h.a+=H.G(k)
+break}else if((j&1)!==0){if(s)switch(j){case 69:case 67:h.a+=A.J(k)
 break
-case 65:h.a+=H.G(k);--g
+case 65:h.a+=A.J(k);--g
 break
-default:q=h.a+=H.G(k)
-h.a=q+H.G(k)
+default:q=h.a+=A.J(k)
+h.a=q+A.J(k)
 break}else{l.b=j
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 return""}j=0}if(g===c)break $label0$0
@@ -3896,280 +4052,275 @@ break}n=p+1
 f=a[p]
 if(f>=128){o=n-1
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-break}p=n}if(o-g<20)for(m=g;m<o;++m)h.a+=H.G(a[m])
-else h.a+=P.h5(a,g,o)
+break}p=n}if(o-g<20)for(m=g;m<o;++m)h.a+=A.J(a[m])
+else h.a+=A.h8(a,g,o)
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-g=p}else g=p}if(d&&j>32)if(s)h.a+=H.G(k)
+g=p}else g=p}if(d&&j>32)if(s)h.a+=A.J(k)
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 l.c=c
 return""}l.b=j
 l.c=i
 s=h.a
 return s.charCodeAt(0)==0?s:s}}
-P.dP.prototype={
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+$.hO=null
+$.ex=null
+$.fj=null})();(function lazyInitializers(){var s=hunkHelpers.lazyFinal
+s($,"lA","fv",()=>A.l7("_$dart_dartClosure"))
+s($,"lJ","ik",()=>A.aa(A.e5({
+toString:function(){return"$receiver$"}})))
+s($,"lK","il",()=>A.aa(A.e5({$method$:null,
+toString:function(){return"$receiver$"}})))
+s($,"lL","im",()=>A.aa(A.e5(null)))
+s($,"lM","io",()=>A.aa(function(){var $argumentsExpr$="$arguments$"
+try{null.$method$($argumentsExpr$)}catch(r){return r.message}}()))
+s($,"lP","ir",()=>A.aa(A.e5(void 0)))
+s($,"lQ","is",()=>A.aa(function(){var $argumentsExpr$="$arguments$"
+try{(void 0).$method$($argumentsExpr$)}catch(r){return r.message}}()))
+s($,"lO","iq",()=>A.aa(A.hc(null)))
+s($,"lN","ip",()=>A.aa(function(){try{null.$method$}catch(r){return r.message}}()))
+s($,"lS","iu",()=>A.aa(A.hc(void 0)))
+s($,"lR","it",()=>A.aa(function(){try{(void 0).$method$}catch(r){return r.message}}()))
+s($,"lT","iv",()=>new A.eb().$0())
+s($,"lU","iw",()=>new A.ea().$0())
+s($,"lV","ix",()=>new Int8Array(A.hP(A.b([-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-2,-2,-2,-2,-2,62,-2,62,-2,63,52,53,54,55,56,57,58,59,60,61,-2,-2,-2,-1,-2,-2,-2,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,-2,-2,-2,-2,63,-2,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,-2,-2,-2,-2,-2],t.t))))
+s($,"lW","fx",()=>typeof process!="undefined"&&Object.prototype.toString.call(process)=="[object process]"&&process.platform=="win32")
+s($,"lX","iy",()=>A.l("^[\\-\\.0-9A-Z_a-z~]*$",!1))
+s($,"mg","fy",()=>A.i8(B.a4))
+s($,"mi","iI",()=>A.kv())
+s($,"mw","iQ",()=>A.eV($.bU()))
+s($,"mu","eR",()=>A.eV($.b3()))
+s($,"mp","eQ",()=>new A.c3($.fw(),null))
+s($,"lG","ij",()=>new A.dJ(A.l("/",!1),A.l("[^/]$",!1),A.l("^/",!1)))
+s($,"lI","bU",()=>new A.ec(A.l("[/\\\\]",!1),A.l("[^/\\\\]$",!1),A.l("^(\\\\\\\\[^\\\\]+\\\\[^\\\\/]+|[a-zA-Z]:[/\\\\])",!1),A.l("^[/\\\\](?![/\\\\])",!1)))
+s($,"lH","b3",()=>new A.e9(A.l("/",!1),A.l("(^[a-zA-Z][-+.a-zA-Z\\d]*://|[^/])$",!1),A.l("[a-zA-Z][-+.a-zA-Z\\d]*://[^/]*",!1),A.l("^/",!1)))
+s($,"lF","fw",()=>A.jD())
+s($,"m9","iA",()=>new A.ey().$0())
+s($,"mr","fz",()=>A.hK(A.ib(2,31))-1)
+s($,"ms","fA",()=>-A.hK(A.ib(2,31)))
+s($,"mo","iO",()=>A.l("^#\\d+\\s+(\\S.*) \\((.+?)((?::\\d+){0,2})\\)$",!1))
+s($,"mk","iK",()=>A.l("^\\s*at (?:(\\S.*?)(?: \\[as [^\\]]+\\])? \\((.*)\\)|(.*))$",!1))
+s($,"mn","iN",()=>A.l("^(.*?):(\\d+)(?::(\\d+))?$|native$",!1))
+s($,"mj","iJ",()=>A.l("^eval at (?:\\S.*?) \\((.*)\\)(?:, .*?:\\d+:\\d+)?$",!1))
+s($,"ma","iB",()=>A.l("(\\S+)@(\\S+) line (\\d+) >.* (Function|eval):\\d+:\\d+",!1))
+s($,"mc","iD",()=>A.l("^(?:([^@(/]*)(?:\\(.*\\))?((?:/[^/]*)*)(?:\\(.*\\))?@)?(.*?):(\\d*)(?::(\\d*))?$",!1))
+s($,"me","iF",()=>A.l("^(\\S+)(?: (\\d+)(?::(\\d+))?)?\\s+([^\\d].*)$",!1))
+s($,"m8","iz",()=>A.l("<(<anonymous closure>|[^>]+)_async_body>",!1))
+s($,"mh","iH",()=>A.l("^\\.",!1))
+s($,"lB","ih",()=>A.l("^[a-zA-Z][-+.a-zA-Z\\d]*://",!1))
+s($,"lC","ii",()=>A.l("^([a-zA-Z]:[\\\\/]|\\\\\\\\)",!1))
+s($,"ml","iL",()=>A.l("\\n    ?at ",!1))
+s($,"mm","iM",()=>A.l("    ?at ",!1))
+s($,"mb","iC",()=>A.l("@\\S+ line \\d+ >.* (Function|eval):\\d+:\\d+",!1))
+s($,"md","iE",()=>A.l("^(([.0-9A-Za-z_$/<]|\\(.*\\))*@)?[^\\s]*:\\d*$",!0))
+s($,"mf","iG",()=>A.l("^[^\\s<][^\\s]*( \\d+(:\\d+)?)?[ \\t]+[^\\s]+$",!0))
+s($,"mv","fB",()=>A.l("^<asynchronous suspension>\\n?$",!0))
+s($,"mt","iP",()=>J.iX(self.$dartLoader.rootDirectories,new A.eO(),t.N).ak(0))})();(function nativeSupport(){!function(){var s=function(a){var m={}
 m[a]=1
 return Object.keys(hunkHelpers.convertToFastObject(m))[0]}
 v.getIsolateTag=function(a){return s("___dart_"+a+v.isolateTag)}
@@ -5473,17 +5617,18 @@ for(var o=0;;o++){var n=s(p+"_"+o+"_")
 if(!(n in q)){q[n]=1
 v.isolateTag=n
 break}}v.dispatchPropertyName=v.getIsolateTag("dispatch_record")}()
-hunkHelpers.setOrUpdateInterceptorsByTag({ArrayBuffer:J.y,ApplicationCacheErrorEvent:J.y,DOMError:J.y,ErrorEvent:J.y,Event:J.y,InputEvent:J.y,SubmitEvent:J.y,MediaError:J.y,NavigatorUserMediaError:J.y,OverconstrainedError:J.y,PositionError:J.y,GeolocationPositionError:J.y,SensorErrorEvent:J.y,SpeechRecognitionError:J.y,SQLError:J.y,ArrayBufferView:H.cr,Int8Array:H.cq,Uint32Array:H.cs,Uint8Array:H.ay,DOMException:W.du})
-hunkHelpers.setOrUpdateLeafTags({ArrayBuffer:true,ApplicationCacheErrorEvent:true,DOMError:true,ErrorEvent:true,Event:true,InputEvent:true,SubmitEvent:true,MediaError:true,NavigatorUserMediaError:true,OverconstrainedError:true,PositionError:true,GeolocationPositionError:true,SensorErrorEvent:true,SpeechRecognitionError:true,SQLError:true,ArrayBufferView:false,Int8Array:true,Uint32Array:true,Uint8Array:false,DOMException:true})
-H.aN.$nativeSuperclassTag="ArrayBufferView"
-H.bD.$nativeSuperclassTag="ArrayBufferView"
-H.bE.$nativeSuperclassTag="ArrayBufferView"
-H.bl.$nativeSuperclassTag="ArrayBufferView"})()
+hunkHelpers.setOrUpdateInterceptorsByTag({ApplicationCacheErrorEvent:J.B,DOMError:J.B,ErrorEvent:J.B,Event:J.B,InputEvent:J.B,SubmitEvent:J.B,MediaError:J.B,NavigatorUserMediaError:J.B,OverconstrainedError:J.B,PositionError:J.B,GeolocationPositionError:J.B,SensorErrorEvent:J.B,SpeechRecognitionError:J.B,ArrayBuffer:A.cp,ArrayBufferView:A.cr,Int8Array:A.cq,Uint32Array:A.cs,Uint8Array:A.ay,DOMException:A.dp})
+hunkHelpers.setOrUpdateLeafTags({ApplicationCacheErrorEvent:true,DOMError:true,ErrorEvent:true,Event:true,InputEvent:true,SubmitEvent:true,MediaError:true,NavigatorUserMediaError:true,OverconstrainedError:true,PositionError:true,GeolocationPositionError:true,SensorErrorEvent:true,SpeechRecognitionError:true,ArrayBuffer:true,ArrayBufferView:false,Int8Array:true,Uint32Array:true,Uint8Array:false,DOMException:true})
+A.aP.$nativeSuperclassTag="ArrayBufferView"
+A.bF.$nativeSuperclassTag="ArrayBufferView"
+A.bG.$nativeSuperclassTag="ArrayBufferView"
+A.bo.$nativeSuperclassTag="ArrayBufferView"})()
 Function.prototype.$0=function(){return this()}
 Function.prototype.$1=function(a){return this(a)}
 Function.prototype.$2=function(a,b){return this(a,b)}
 Function.prototype.$3=function(a,b,c){return this(a,b,c)}
 Function.prototype.$1$0=function(){return this()}
+Function.prototype.$2$0=function(){return this()}
 Function.prototype.$1$1=function(a){return this(a)}
 convertAllToFastObject(w)
 convertToFastObject($);(function(a){if(typeof document==="undefined"){a(null)
@@ -5491,7 +5636,7 @@ return}if(typeof document.currentScript!="undefined"){a(document.currentScript)
 return}var s=document.scripts
 function onLoad(b){for(var q=0;q<s.length;++q)s[q].removeEventListener("load",onLoad,false)
 a(b.target)}for(var r=0;r<s.length;++r)s[r].addEventListener("load",onLoad,false)})(function(a){v.currentScript=a
-var s=D.kO
+var s=A.lg
 if(typeof dartMainRunner==="function")dartMainRunner(s,[])
 else s([])})})()
 //# sourceMappingURL=stack_trace_mapper.dart.js.map
diff --git a/build_web_compilers/lib/src/sdk_js_compile_builder.dart b/build_web_compilers/lib/src/sdk_js_compile_builder.dart
index 034f276cc..aaf4675c3 100644
--- a/build_web_compilers/lib/src/sdk_js_compile_builder.dart
+++ b/build_web_compilers/lib/src/sdk_js_compile_builder.dart
@@ -40,11 +40,15 @@ class SdkJsCompileBuilder implements Builder {
   /// The final destination for the compiled JS file.
   final AssetId jsOutputId;
 
+  /// Enables canary features in DDC.
+  final bool canaryFeatures;
+
   SdkJsCompileBuilder({
     required this.sdkKernelPath,
     required String outputPath,
     String? librariesPath,
     String? platformSdk,
+    required this.canaryFeatures,
   })  : platformSdk = platformSdk ?? sdkDir,
         librariesPath = librariesPath ??
             p.join(platformSdk ?? sdkDir, 'lib', 'libraries.json'),
@@ -61,8 +65,8 @@ class SdkJsCompileBuilder implements Builder {
 
   @override
   Future build(BuildStep buildStep) async {
-    await _createDevCompilerModule(
-        buildStep, platformSdk, sdkKernelPath, librariesPath, jsOutputId);
+    await _createDevCompilerModule(buildStep, platformSdk, sdkKernelPath,
+        librariesPath, jsOutputId, canaryFeatures);
   }
 }
 
@@ -73,6 +77,7 @@ Future<void> _createDevCompilerModule(
   String sdkKernelPath,
   String librariesPath,
   AssetId jsOutputId,
+  bool canaryFeatures,
 ) async {
   var scratchSpace = await buildStep.fetchResource(scratchSpaceResource);
   var jsOutputFile = scratchSpace.fileFor(jsOutputId);
@@ -85,6 +90,7 @@ Future<void> _createDevCompilerModule(
       p.join(sdkDir, 'bin', 'snapshots', 'dartdevc.dart.snapshot'),
       '--multi-root-scheme=org-dartlang-sdk',
       '--modules=amd',
+      if (canaryFeatures) '--canary',
       '--module-name=dart_sdk',
       '-o',
       jsOutputFile.path,
diff --git a/build_web_compilers/pubspec.yaml b/build_web_compilers/pubspec.yaml
index 17eb86403..ff23f6f3f 100644
--- a/build_web_compilers/pubspec.yaml
+++ b/build_web_compilers/pubspec.yaml
@@ -1,5 +1,5 @@
 name: build_web_compilers
-version: 4.0.4-wip
+version: 4.0.4
 description: Builder implementations wrapping the dart2js and DDC compilers.
 repository: https://github.com/dart-lang/build/tree/master/build_web_compilers
 
diff --git a/build_web_compilers/test/dev_compiler_bootstrap_test.dart b/build_web_compilers/test/dev_compiler_bootstrap_test.dart
index dc30c8be9..a314e9453 100644
--- a/build_web_compilers/test/dev_compiler_bootstrap_test.dart
+++ b/build_web_compilers/test/dev_compiler_bootstrap_test.dart
@@ -121,6 +121,34 @@ void main() {
           assets,
           outputs: expectedOutputs);
     });
+
+    test('can enable canary features for SDK', () async {
+      var sdkAssets = <String, Object>{'build_web_compilers|fake.txt': ''};
+      await testBuilderAndCollectAssets(
+          sdkJsCompile(BuilderOptions({'canary': true})), sdkAssets);
+
+      var expectedOutputs = {
+        'build_web_compilers|fake.txt': isEmpty,
+        'build_web_compilers|lib/src/dev_compiler/dart_sdk.js':
+            decodedMatches(contains('canary')),
+        'build_web_compilers|lib/src/dev_compiler/dart_sdk.js.map': isNotEmpty,
+      };
+      expect(sdkAssets, expectedOutputs);
+    });
+
+    test('does not enable canary features for SDK by default', () async {
+      var sdkAssets = <String, Object>{'build_web_compilers|fake.txt': ''};
+      await testBuilderAndCollectAssets(
+          sdkJsCompile(BuilderOptions({})), sdkAssets);
+
+      var expectedOutputs = {
+        'build_web_compilers|fake.txt': isEmpty,
+        'build_web_compilers|lib/src/dev_compiler/dart_sdk.js':
+            decodedMatches(isNot(contains('canary'))),
+        'build_web_compilers|lib/src/dev_compiler/dart_sdk.js.map': isNotEmpty,
+      };
+      expect(sdkAssets, expectedOutputs);
+    });
   });
 }
 
@@ -132,7 +160,8 @@ Future<void> runPrerequisites(Map<String, Object> assets) async {
   // package exists.
   var sdkAssets = <String, Object>{'build_web_compilers|fake.txt': ''};
   await testBuilderAndCollectAssets(sdkJsCopyRequirejs(null), sdkAssets);
-  await testBuilderAndCollectAssets(sdkJsCompile(null), sdkAssets);
+  await testBuilderAndCollectAssets(
+      sdkJsCompile(BuilderOptions({})), sdkAssets);
   assets.addAll(sdkAssets);
 
   await testBuilderAndCollectAssets(const ModuleLibraryBuilder(), assets);
diff --git a/build_web_compilers/test/dev_compiler_builder_test.dart b/build_web_compilers/test/dev_compiler_builder_test.dart
index 68938e423..eb5985b96 100644
--- a/build_web_compilers/test/dev_compiler_builder_test.dart
+++ b/build_web_compilers/test/dev_compiler_builder_test.dart
@@ -108,6 +108,44 @@ void main() {
           outputs: expectedOutputs);
     });
 
+    test('can enable DDC canary features', () async {
+      var expectedOutputs = {
+        'b|lib/b$jsModuleExtension': isNotEmpty,
+        'b|lib/b$jsSourceMapExtension': isNotEmpty,
+        'b|lib/b$metadataExtension': isNotEmpty,
+        'a|lib/a$jsModuleExtension': decodedMatches(contains('canary')),
+        'a|lib/a$jsSourceMapExtension': isNotEmpty,
+        'a|lib/a$metadataExtension': isNotEmpty,
+        'a|web/index$jsModuleExtension': isNotEmpty,
+        'a|web/index$jsSourceMapExtension': isNotEmpty,
+        'a|web/index$metadataExtension': isNotEmpty,
+      };
+      await testBuilder(
+        DevCompilerBuilder(platform: ddcPlatform, canaryFeatures: true),
+        assets,
+        outputs: expectedOutputs,
+      );
+    });
+
+    test('does not enable DDC canary features by default', () async {
+      var expectedOutputs = {
+        'b|lib/b$jsModuleExtension': isNotEmpty,
+        'b|lib/b$jsSourceMapExtension': isNotEmpty,
+        'b|lib/b$metadataExtension': isNotEmpty,
+        'a|lib/a$jsModuleExtension': decodedMatches(isNot(contains('canary'))),
+        'a|lib/a$jsSourceMapExtension': isNotEmpty,
+        'a|lib/a$metadataExtension': isNotEmpty,
+        'a|web/index$jsModuleExtension': isNotEmpty,
+        'a|web/index$jsSourceMapExtension': isNotEmpty,
+        'a|web/index$metadataExtension': isNotEmpty,
+      };
+      await testBuilder(
+        DevCompilerBuilder(platform: ddcPlatform),
+        assets,
+        outputs: expectedOutputs,
+      );
+    });
+
     test('generates full dill when enabled', () async {
       var expectedOutputs = {
         'b|lib/b$jsModuleExtension': isNotEmpty,
diff --git a/build_web_compilers/web/stack_trace_mapper.dart b/build_web_compilers/web/stack_trace_mapper.dart
index 78d1af8e5..710362790 100644
--- a/build_web_compilers/web/stack_trace_mapper.dart
+++ b/build_web_compilers/web/stack_trace_mapper.dart
@@ -81,6 +81,7 @@ class LazyMapping extends Mapping {
 
   LazyMapping(this._provider);
 
+  // ignore: unreachable_from_main
   List toJson() => _bundle.toJson();
 
   @override