diff --git a/circle.yml b/circle.yml
index f6ee89045..268ce6735 100644
--- a/circle.yml
+++ b/circle.yml
@@ -10,10 +10,13 @@ dependencies:
   post:
     - mv ./gopherjs $HOME/bin
     - npm install --global node-gyp
+    - npm install
     - cd node-syscall && node-gyp rebuild && mkdir -p ~/.node_libraries/ && cp build/Release/syscall.node ~/.node_libraries/syscall.node
 
 test:
   override:
+    - PATH=node_modules/.bin:$PATH go generate github.com/gopherjs/gopherjs/compiler/prelude
+    - diff -u <(echo -n) <(git status --porcelain)
     - diff -u <(echo -n) <(gofmt -d .)
     - go tool vet *.go                                                   # Go package in root directory.
     - for d in */; do echo $d; done | grep -v tests/ | grep -v third_party/ | xargs go tool vet # All subdirectories except "tests", "third_party".
diff --git a/compiler/prelude/prelude.go b/compiler/prelude/prelude.go
index 8ee4ea5bf..41b592408 100644
--- a/compiler/prelude/prelude.go
+++ b/compiler/prelude/prelude.go
@@ -1,5 +1,7 @@
 package prelude
 
+//go:generate go run regen.go
+
 const Prelude = prelude + numeric + types + goroutines + jsmapping
 
 const prelude = `Error.stackTraceLimit = Infinity;
diff --git a/compiler/prelude/prelude_min.go b/compiler/prelude/prelude_min.go
new file mode 100644
index 000000000..7d0820e17
--- /dev/null
+++ b/compiler/prelude/prelude_min.go
@@ -0,0 +1,6 @@
+// Code generated by regen. DO NOT EDIT.
+
+package prelude
+
+const Minified = `Error.stackTraceLimit=Infinity;var $global,$module;if(typeof window!=="undefined"){$global=window}else if(typeof self!=="undefined"){$global=self}else if(typeof global!=="undefined"){$global=global;$global.require=require}else{$global=this}if($global===undefined||$global.Array===undefined){throw new Error("no global object found")}if(typeof module!=="undefined"){$module=module}var $packages={},$idCounter=0;var $keys=function(m){return m?Object.keys(m):[]};var $flushConsole=function(){};var $throwRuntimeError;var $throwNilPointerError=function(){$throwRuntimeError("invalid memory address or nil pointer dereference")};var $call=function(fn,rcvr,args){return fn.apply(rcvr,args)};var $makeFunc=function(fn){return function(){return $externalize(fn(this,new($sliceType($jsObjectPtr))($global.Array.prototype.slice.call(arguments,[]))),$emptyInterface)}};var $unused=function(v){};var $mapArray=function(array,f){var newArray=new array.constructor(array.length);for(var i=0;i<array.length;i++){newArray[i]=f(array[i])}return newArray};var $methodVal=function(recv,name){var vals=recv.$methodVals||{};recv.$methodVals=vals;var f=vals[name];if(f!==undefined){return f}var method=recv[name];f=function(){$stackDepthOffset--;try{return method.apply(recv,arguments)}finally{$stackDepthOffset++}};vals[name]=f;return f};var $methodExpr=function(typ,name){var method=typ.prototype[name];if(method.$expr===undefined){method.$expr=function(){$stackDepthOffset--;try{if(typ.wrapped){arguments[0]=new typ(arguments[0])}return Function.call.apply(method,arguments)}finally{$stackDepthOffset++}}}return method.$expr};var $ifaceMethodExprs={};var $ifaceMethodExpr=function(name){var expr=$ifaceMethodExprs["$"+name];if(expr===undefined){expr=$ifaceMethodExprs["$"+name]=function(){$stackDepthOffset--;try{return Function.call.apply(arguments[0][name],arguments)}finally{$stackDepthOffset++}}}return expr};var $subslice=function(slice,low,high,max){if(low<0||high<low||max<high||high>slice.$capacity||max>slice.$capacity){$throwRuntimeError("slice bounds out of range")}var s=new slice.constructor(slice.$array);s.$offset=slice.$offset+low;s.$length=slice.$length-low;s.$capacity=slice.$capacity-low;if(high!==undefined){s.$length=high-low}if(max!==undefined){s.$capacity=max-low}return s};var $substring=function(str,low,high){if(low<0||high<low||high>str.length){$throwRuntimeError("slice bounds out of range")}return str.substring(low,high)};var $sliceToArray=function(slice){if(slice.$array.constructor!==Array){return slice.$array.subarray(slice.$offset,slice.$offset+slice.$length)}return slice.$array.slice(slice.$offset,slice.$offset+slice.$length)};var $decodeRune=function(str,pos){var c0=str.charCodeAt(pos);if(c0<128){return[c0,1]}if(c0!==c0||c0<192){return[65533,1]}var c1=str.charCodeAt(pos+1);if(c1!==c1||c1<128||192<=c1){return[65533,1]}if(c0<224){var r=(c0&31)<<6|c1&63;if(r<=127){return[65533,1]}return[r,2]}var c2=str.charCodeAt(pos+2);if(c2!==c2||c2<128||192<=c2){return[65533,1]}if(c0<240){var r=(c0&15)<<12|(c1&63)<<6|c2&63;if(r<=2047){return[65533,1]}if(55296<=r&&r<=57343){return[65533,1]}return[r,3]}var c3=str.charCodeAt(pos+3);if(c3!==c3||c3<128||192<=c3){return[65533,1]}if(c0<248){var r=(c0&7)<<18|(c1&63)<<12|(c2&63)<<6|c3&63;if(r<=65535||1114111<r){return[65533,1]}return[r,4]}return[65533,1]};var $encodeRune=function(r){if(r<0||r>1114111||55296<=r&&r<=57343){r=65533}if(r<=127){return String.fromCharCode(r)}if(r<=2047){return String.fromCharCode(192|r>>6,128|r&63)}if(r<=65535){return String.fromCharCode(224|r>>12,128|r>>6&63,128|r&63)}return String.fromCharCode(240|r>>18,128|r>>12&63,128|r>>6&63,128|r&63)};var $stringToBytes=function(str){var array=new Uint8Array(str.length);for(var i=0;i<str.length;i++){array[i]=str.charCodeAt(i)}return array};var $bytesToString=function(slice){if(slice.$length===0){return""}var str="";for(var i=0;i<slice.$length;i+=1e4){str+=String.fromCharCode.apply(undefined,slice.$array.subarray(slice.$offset+i,slice.$offset+Math.min(slice.$length,i+1e4)))}return str};var $stringToRunes=function(str){var array=new Int32Array(str.length);var rune,j=0;for(var i=0;i<str.length;i+=rune[1],j++){rune=$decodeRune(str,i);array[j]=rune[0]}return array.subarray(0,j)};var $runesToString=function(slice){if(slice.$length===0){return""}var str="";for(var i=0;i<slice.$length;i++){str+=$encodeRune(slice.$array[slice.$offset+i])}return str};var $copyString=function(dst,src){var n=Math.min(src.length,dst.$length);for(var i=0;i<n;i++){dst.$array[dst.$offset+i]=src.charCodeAt(i)}return n};var $copySlice=function(dst,src){var n=Math.min(src.$length,dst.$length);$copyArray(dst.$array,src.$array,dst.$offset,src.$offset,n,dst.constructor.elem);return n};var $copyArray=function(dst,src,dstOffset,srcOffset,n,elem){if(n===0||dst===src&&dstOffset===srcOffset){return}if(src.subarray){dst.set(src.subarray(srcOffset,srcOffset+n),dstOffset);return}switch(elem.kind){case $kindArray:case $kindStruct:if(dst===src&&dstOffset>srcOffset){for(var i=n-1;i>=0;i--){elem.copy(dst[dstOffset+i],src[srcOffset+i])}return}for(var i=0;i<n;i++){elem.copy(dst[dstOffset+i],src[srcOffset+i])}return}if(dst===src&&dstOffset>srcOffset){for(var i=n-1;i>=0;i--){dst[dstOffset+i]=src[srcOffset+i]}return}for(var i=0;i<n;i++){dst[dstOffset+i]=src[srcOffset+i]}};var $clone=function(src,type){var clone=type.zero();type.copy(clone,src);return clone};var $pointerOfStructConversion=function(obj,type){if(obj.$proxies===undefined){obj.$proxies={};obj.$proxies[obj.constructor.string]=obj}var proxy=obj.$proxies[type.string];if(proxy===undefined){var properties={};for(var i=0;i<type.elem.fields.length;i++){(function(fieldProp){properties[fieldProp]={get:function(){return obj[fieldProp]},set:function(value){obj[fieldProp]=value}}})(type.elem.fields[i].prop)}proxy=Object.create(type.prototype,properties);proxy.$val=proxy;obj.$proxies[type.string]=proxy;proxy.$proxies=obj.$proxies}return proxy};var $append=function(slice){return $internalAppend(slice,arguments,1,arguments.length-1)};var $appendSlice=function(slice,toAppend){if(toAppend.constructor===String){var bytes=$stringToBytes(toAppend);return $internalAppend(slice,bytes,0,bytes.length)}return $internalAppend(slice,toAppend.$array,toAppend.$offset,toAppend.$length)};var $internalAppend=function(slice,array,offset,length){if(length===0){return slice}var newArray=slice.$array;var newOffset=slice.$offset;var newLength=slice.$length+length;var newCapacity=slice.$capacity;if(newLength>newCapacity){newOffset=0;newCapacity=Math.max(newLength,slice.$capacity<1024?slice.$capacity*2:Math.floor(slice.$capacity*5/4));if(slice.$array.constructor===Array){newArray=slice.$array.slice(slice.$offset,slice.$offset+slice.$length);newArray.length=newCapacity;var zero=slice.constructor.elem.zero;for(var i=slice.$length;i<newCapacity;i++){newArray[i]=zero()}}else{newArray=new slice.$array.constructor(newCapacity);newArray.set(slice.$array.subarray(slice.$offset,slice.$offset+slice.$length))}}$copyArray(newArray,array,newOffset+slice.$length,offset,length,slice.constructor.elem);var newSlice=new slice.constructor(newArray);newSlice.$offset=newOffset;newSlice.$length=newLength;newSlice.$capacity=newCapacity;return newSlice};var $equal=function(a,b,type){if(type===$jsObjectPtr){return a===b}switch(type.kind){case $kindComplex64:case $kindComplex128:return a.$real===b.$real&&a.$imag===b.$imag;case $kindInt64:case $kindUint64:return a.$high===b.$high&&a.$low===b.$low;case $kindArray:if(a.length!==b.length){return false}for(var i=0;i<a.length;i++){if(!$equal(a[i],b[i],type.elem)){return false}}return true;case $kindStruct:for(var i=0;i<type.fields.length;i++){var f=type.fields[i];if(!$equal(a[f.prop],b[f.prop],f.typ)){return false}}return true;case $kindInterface:return $interfaceIsEqual(a,b);default:return a===b}};var $interfaceIsEqual=function(a,b){if(a===$ifaceNil||b===$ifaceNil){return a===b}if(a.constructor!==b.constructor){return false}if(a.constructor===$jsObjectPtr){return a.object===b.object}if(!a.constructor.comparable){$throwRuntimeError("comparing uncomparable type "+a.constructor.string)}return $equal(a.$val,b.$val,a.constructor)};var $min=Math.min;var $mod=function(x,y){return x%y};var $parseInt=parseInt;var $parseFloat=function(f){if(f!==undefined&&f!==null&&f.constructor===Number){return f}return parseFloat(f)};var $froundBuf=new Float32Array(1);var $fround=Math.fround||function(f){$froundBuf[0]=f;return $froundBuf[0]};var $imul=Math.imul||function(a,b){var ah=a>>>16&65535;var al=a&65535;var bh=b>>>16&65535;var bl=b&65535;return al*bl+(ah*bl+al*bh<<16>>>0)>>0};var $floatKey=function(f){if(f!==f){$idCounter++;return"NaN$"+$idCounter}return String(f)};var $flatten64=function(x){return x.$high*4294967296+x.$low};var $shiftLeft64=function(x,y){if(y===0){return x}if(y<32){return new x.constructor(x.$high<<y|x.$low>>>32-y,x.$low<<y>>>0)}if(y<64){return new x.constructor(x.$low<<y-32,0)}return new x.constructor(0,0)};var $shiftRightInt64=function(x,y){if(y===0){return x}if(y<32){return new x.constructor(x.$high>>y,(x.$low>>>y|x.$high<<32-y)>>>0)}if(y<64){return new x.constructor(x.$high>>31,x.$high>>y-32>>>0)}if(x.$high<0){return new x.constructor(-1,4294967295)}return new x.constructor(0,0)};var $shiftRightUint64=function(x,y){if(y===0){return x}if(y<32){return new x.constructor(x.$high>>>y,(x.$low>>>y|x.$high<<32-y)>>>0)}if(y<64){return new x.constructor(0,x.$high>>>y-32)}return new x.constructor(0,0)};var $mul64=function(x,y){var high=0,low=0;if((y.$low&1)!==0){high=x.$high;low=x.$low}for(var i=1;i<32;i++){if((y.$low&1<<i)!==0){high+=x.$high<<i|x.$low>>>32-i;low+=x.$low<<i>>>0}}for(var i=0;i<32;i++){if((y.$high&1<<i)!==0){high+=x.$low<<i}}return new x.constructor(high,low)};var $div64=function(x,y,returnRemainder){if(y.$high===0&&y.$low===0){$throwRuntimeError("integer divide by zero")}var s=1;var rs=1;var xHigh=x.$high;var xLow=x.$low;if(xHigh<0){s=-1;rs=-1;xHigh=-xHigh;if(xLow!==0){xHigh--;xLow=4294967296-xLow}}var yHigh=y.$high;var yLow=y.$low;if(y.$high<0){s*=-1;yHigh=-yHigh;if(yLow!==0){yHigh--;yLow=4294967296-yLow}}var high=0,low=0,n=0;while(yHigh<2147483648&&(xHigh>yHigh||xHigh===yHigh&&xLow>yLow)){yHigh=(yHigh<<1|yLow>>>31)>>>0;yLow=yLow<<1>>>0;n++}for(var i=0;i<=n;i++){high=high<<1|low>>>31;low=low<<1>>>0;if(xHigh>yHigh||xHigh===yHigh&&xLow>=yLow){xHigh=xHigh-yHigh;xLow=xLow-yLow;if(xLow<0){xHigh--;xLow+=4294967296}low++;if(low===4294967296){high++;low=0}}yLow=(yLow>>>1|yHigh<<32-1)>>>0;yHigh=yHigh>>>1}if(returnRemainder){return new x.constructor(xHigh*rs,xLow*rs)}return new x.constructor(high*s,low*s)};var $divComplex=function(n,d){var ninf=n.$real===Infinity||n.$real===-Infinity||n.$imag===Infinity||n.$imag===-Infinity;var dinf=d.$real===Infinity||d.$real===-Infinity||d.$imag===Infinity||d.$imag===-Infinity;var nnan=!ninf&&(n.$real!==n.$real||n.$imag!==n.$imag);var dnan=!dinf&&(d.$real!==d.$real||d.$imag!==d.$imag);if(nnan||dnan){return new n.constructor(NaN,NaN)}if(ninf&&!dinf){return new n.constructor(Infinity,Infinity)}if(!ninf&&dinf){return new n.constructor(0,0)}if(d.$real===0&&d.$imag===0){if(n.$real===0&&n.$imag===0){return new n.constructor(NaN,NaN)}return new n.constructor(Infinity,Infinity)}var a=Math.abs(d.$real);var b=Math.abs(d.$imag);if(a<=b){var ratio=d.$real/d.$imag;var denom=d.$real*ratio+d.$imag;return new n.constructor((n.$real*ratio+n.$imag)/denom,(n.$imag*ratio-n.$real)/denom)}var ratio=d.$imag/d.$real;var denom=d.$imag*ratio+d.$real;return new n.constructor((n.$imag*ratio+n.$real)/denom,(n.$imag-n.$real*ratio)/denom)};var $kindBool=1;var $kindInt=2;var $kindInt8=3;var $kindInt16=4;var $kindInt32=5;var $kindInt64=6;var $kindUint=7;var $kindUint8=8;var $kindUint16=9;var $kindUint32=10;var $kindUint64=11;var $kindUintptr=12;var $kindFloat32=13;var $kindFloat64=14;var $kindComplex64=15;var $kindComplex128=16;var $kindArray=17;var $kindChan=18;var $kindFunc=19;var $kindInterface=20;var $kindMap=21;var $kindPtr=22;var $kindSlice=23;var $kindString=24;var $kindStruct=25;var $kindUnsafePointer=26;var $methodSynthesizers=[];var $addMethodSynthesizer=function(f){if($methodSynthesizers===null){f();return}$methodSynthesizers.push(f)};var $synthesizeMethods=function(){$methodSynthesizers.forEach(function(f){f()});$methodSynthesizers=null};var $ifaceKeyFor=function(x){if(x===$ifaceNil){return"nil"}var c=x.constructor;return c.string+"$"+c.keyFor(x.$val)};var $identity=function(x){return x};var $typeIDCounter=0;var $idKey=function(x){if(x.$id===undefined){$idCounter++;x.$id=$idCounter}return String(x.$id)};var $newType=function(size,kind,string,named,pkg,exported,constructor){var typ;switch(kind){case $kindBool:case $kindInt:case $kindInt8:case $kindInt16:case $kindInt32:case $kindUint:case $kindUint8:case $kindUint16:case $kindUint32:case $kindUintptr:case $kindUnsafePointer:typ=function(v){this.$val=v};typ.wrapped=true;typ.keyFor=$identity;break;case $kindString:typ=function(v){this.$val=v};typ.wrapped=true;typ.keyFor=function(x){return"$"+x};break;case $kindFloat32:case $kindFloat64:typ=function(v){this.$val=v};typ.wrapped=true;typ.keyFor=function(x){return $floatKey(x)};break;case $kindInt64:typ=function(high,low){this.$high=high+Math.floor(Math.ceil(low)/4294967296)>>0;this.$low=low>>>0;this.$val=this};typ.keyFor=function(x){return x.$high+"$"+x.$low};break;case $kindUint64:typ=function(high,low){this.$high=high+Math.floor(Math.ceil(low)/4294967296)>>>0;this.$low=low>>>0;this.$val=this};typ.keyFor=function(x){return x.$high+"$"+x.$low};break;case $kindComplex64:typ=function(real,imag){this.$real=$fround(real);this.$imag=$fround(imag);this.$val=this};typ.keyFor=function(x){return x.$real+"$"+x.$imag};break;case $kindComplex128:typ=function(real,imag){this.$real=real;this.$imag=imag;this.$val=this};typ.keyFor=function(x){return x.$real+"$"+x.$imag};break;case $kindArray:typ=function(v){this.$val=v};typ.wrapped=true;typ.ptr=$newType(4,$kindPtr,"*"+string,false,"",false,function(array){this.$get=function(){return array};this.$set=function(v){typ.copy(this,v)};this.$val=array});typ.init=function(elem,len){typ.elem=elem;typ.len=len;typ.comparable=elem.comparable;typ.keyFor=function(x){return Array.prototype.join.call($mapArray(x,function(e){return String(elem.keyFor(e)).replace(/\\/g,"\\\\").replace(/\$/g,"\\$")}),"$")};typ.copy=function(dst,src){$copyArray(dst,src,0,0,src.length,elem)};typ.ptr.init(typ);Object.defineProperty(typ.ptr.nil,"nilCheck",{get:$throwNilPointerError})};break;case $kindChan:typ=function(v){this.$val=v};typ.wrapped=true;typ.keyFor=$idKey;typ.init=function(elem,sendOnly,recvOnly){typ.elem=elem;typ.sendOnly=sendOnly;typ.recvOnly=recvOnly};break;case $kindFunc:typ=function(v){this.$val=v};typ.wrapped=true;typ.init=function(params,results,variadic){typ.params=params;typ.results=results;typ.variadic=variadic;typ.comparable=false};break;case $kindInterface:typ={implementedBy:{},missingMethodFor:{}};typ.keyFor=$ifaceKeyFor;typ.init=function(methods){typ.methods=methods;methods.forEach(function(m){$ifaceNil[m.prop]=$throwNilPointerError})};break;case $kindMap:typ=function(v){this.$val=v};typ.wrapped=true;typ.init=function(key,elem){typ.key=key;typ.elem=elem;typ.comparable=false};break;case $kindPtr:typ=constructor||function(getter,setter,target){this.$get=getter;this.$set=setter;this.$target=target;this.$val=this};typ.keyFor=$idKey;typ.init=function(elem){typ.elem=elem;typ.wrapped=elem.kind===$kindArray;typ.nil=new typ($throwNilPointerError,$throwNilPointerError)};break;case $kindSlice:typ=function(array){if(array.constructor!==typ.nativeArray){array=new typ.nativeArray(array)}this.$array=array;this.$offset=0;this.$length=array.length;this.$capacity=array.length;this.$val=this};typ.init=function(elem){typ.elem=elem;typ.comparable=false;typ.nativeArray=$nativeArray(elem.kind);typ.nil=new typ([])};break;case $kindStruct:typ=function(v){this.$val=v};typ.wrapped=true;typ.ptr=$newType(4,$kindPtr,"*"+string,false,pkg,exported,constructor);typ.ptr.elem=typ;typ.ptr.prototype.$get=function(){return this};typ.ptr.prototype.$set=function(v){typ.copy(this,v)};typ.init=function(pkgPath,fields){typ.pkgPath=pkgPath;typ.fields=fields;fields.forEach(function(f){if(!f.typ.comparable){typ.comparable=false}});typ.keyFor=function(x){var val=x.$val;return $mapArray(fields,function(f){return String(f.typ.keyFor(val[f.prop])).replace(/\\/g,"\\\\").replace(/\$/g,"\\$")}).join("$")};typ.copy=function(dst,src){for(var i=0;i<fields.length;i++){var f=fields[i];switch(f.typ.kind){case $kindArray:case $kindStruct:f.typ.copy(dst[f.prop],src[f.prop]);continue;default:dst[f.prop]=src[f.prop];continue}}};var properties={};fields.forEach(function(f){properties[f.prop]={get:$throwNilPointerError,set:$throwNilPointerError}});typ.ptr.nil=Object.create(constructor.prototype,properties);typ.ptr.nil.$val=typ.ptr.nil;$addMethodSynthesizer(function(){var synthesizeMethod=function(target,m,f){if(target.prototype[m.prop]!==undefined){return}target.prototype[m.prop]=function(){var v=this.$val[f.prop];if(f.typ===$jsObjectPtr){v=new $jsObjectPtr(v)}if(v.$val===undefined){v=new f.typ(v)}return v[m.prop].apply(v,arguments)}};fields.forEach(function(f){if(f.anonymous){$methodSet(f.typ).forEach(function(m){synthesizeMethod(typ,m,f);synthesizeMethod(typ.ptr,m,f)});$methodSet($ptrType(f.typ)).forEach(function(m){synthesizeMethod(typ.ptr,m,f)})}})})};break;default:$panic(new $String("invalid kind: "+kind))}switch(kind){case $kindBool:case $kindMap:typ.zero=function(){return false};break;case $kindInt:case $kindInt8:case $kindInt16:case $kindInt32:case $kindUint:case $kindUint8:case $kindUint16:case $kindUint32:case $kindUintptr:case $kindUnsafePointer:case $kindFloat32:case $kindFloat64:typ.zero=function(){return 0};break;case $kindString:typ.zero=function(){return""};break;case $kindInt64:case $kindUint64:case $kindComplex64:case $kindComplex128:var zero=new typ(0,0);typ.zero=function(){return zero};break;case $kindPtr:case $kindSlice:typ.zero=function(){return typ.nil};break;case $kindChan:typ.zero=function(){return $chanNil};break;case $kindFunc:typ.zero=function(){return $throwNilPointerError};break;case $kindInterface:typ.zero=function(){return $ifaceNil};break;case $kindArray:typ.zero=function(){var arrayClass=$nativeArray(typ.elem.kind);if(arrayClass!==Array){return new arrayClass(typ.len)}var array=new Array(typ.len);for(var i=0;i<typ.len;i++){array[i]=typ.elem.zero()}return array};break;case $kindStruct:typ.zero=function(){return new typ.ptr};break;default:$panic(new $String("invalid kind: "+kind))}typ.id=$typeIDCounter;$typeIDCounter++;typ.size=size;typ.kind=kind;typ.string=string;typ.named=named;typ.pkg=pkg;typ.exported=exported;typ.methods=[];typ.methodSetCache=null;typ.comparable=true;return typ};var $methodSet=function(typ){if(typ.methodSetCache!==null){return typ.methodSetCache}var base={};var isPtr=typ.kind===$kindPtr;if(isPtr&&typ.elem.kind===$kindInterface){typ.methodSetCache=[];return[]}var current=[{typ:isPtr?typ.elem:typ,indirect:isPtr}];var seen={};while(current.length>0){var next=[];var mset=[];current.forEach(function(e){if(seen[e.typ.string]){return}seen[e.typ.string]=true;if(e.typ.named){mset=mset.concat(e.typ.methods);if(e.indirect){mset=mset.concat($ptrType(e.typ).methods)}}switch(e.typ.kind){case $kindStruct:e.typ.fields.forEach(function(f){if(f.anonymous){var fTyp=f.typ;var fIsPtr=fTyp.kind===$kindPtr;next.push({typ:fIsPtr?fTyp.elem:fTyp,indirect:e.indirect||fIsPtr})}});break;case $kindInterface:mset=mset.concat(e.typ.methods);break}});mset.forEach(function(m){if(base[m.name]===undefined){base[m.name]=m}});current=next}typ.methodSetCache=[];Object.keys(base).sort().forEach(function(name){typ.methodSetCache.push(base[name])});return typ.methodSetCache};var $Bool=$newType(1,$kindBool,"bool",true,"",false,null);var $Int=$newType(4,$kindInt,"int",true,"",false,null);var $Int8=$newType(1,$kindInt8,"int8",true,"",false,null);var $Int16=$newType(2,$kindInt16,"int16",true,"",false,null);var $Int32=$newType(4,$kindInt32,"int32",true,"",false,null);var $Int64=$newType(8,$kindInt64,"int64",true,"",false,null);var $Uint=$newType(4,$kindUint,"uint",true,"",false,null);var $Uint8=$newType(1,$kindUint8,"uint8",true,"",false,null);var $Uint16=$newType(2,$kindUint16,"uint16",true,"",false,null);var $Uint32=$newType(4,$kindUint32,"uint32",true,"",false,null);var $Uint64=$newType(8,$kindUint64,"uint64",true,"",false,null);var $Uintptr=$newType(4,$kindUintptr,"uintptr",true,"",false,null);var $Float32=$newType(4,$kindFloat32,"float32",true,"",false,null);var $Float64=$newType(8,$kindFloat64,"float64",true,"",false,null);var $Complex64=$newType(8,$kindComplex64,"complex64",true,"",false,null);var $Complex128=$newType(16,$kindComplex128,"complex128",true,"",false,null);var $String=$newType(8,$kindString,"string",true,"",false,null);var $UnsafePointer=$newType(4,$kindUnsafePointer,"unsafe.Pointer",true,"",false,null);var $nativeArray=function(elemKind){switch(elemKind){case $kindInt:return Int32Array;case $kindInt8:return Int8Array;case $kindInt16:return Int16Array;case $kindInt32:return Int32Array;case $kindUint:return Uint32Array;case $kindUint8:return Uint8Array;case $kindUint16:return Uint16Array;case $kindUint32:return Uint32Array;case $kindUintptr:return Uint32Array;case $kindFloat32:return Float32Array;case $kindFloat64:return Float64Array;default:return Array}};var $toNativeArray=function(elemKind,array){var nativeArray=$nativeArray(elemKind);if(nativeArray===Array){return array}return new nativeArray(array)};var $arrayTypes={};var $arrayType=function(elem,len){var typeKey=elem.id+"$"+len;var typ=$arrayTypes[typeKey];if(typ===undefined){typ=$newType(12,$kindArray,"["+len+"]"+elem.string,false,"",false,null);$arrayTypes[typeKey]=typ;typ.init(elem,len)}return typ};var $chanType=function(elem,sendOnly,recvOnly){var string=(recvOnly?"<-":"")+"chan"+(sendOnly?"<- ":" ")+elem.string;var field=sendOnly?"SendChan":recvOnly?"RecvChan":"Chan";var typ=elem[field];if(typ===undefined){typ=$newType(4,$kindChan,string,false,"",false,null);elem[field]=typ;typ.init(elem,sendOnly,recvOnly)}return typ};var $Chan=function(elem,capacity){if(capacity<0||capacity>2147483647){$throwRuntimeError("makechan: size out of range")}this.$elem=elem;this.$capacity=capacity;this.$buffer=[];this.$sendQueue=[];this.$recvQueue=[];this.$closed=false};var $chanNil=new $Chan(null,0);$chanNil.$sendQueue=$chanNil.$recvQueue={length:0,push:function(){},shift:function(){return undefined},indexOf:function(){return-1}};var $funcTypes={};var $funcType=function(params,results,variadic){var typeKey=$mapArray(params,function(p){return p.id}).join(",")+"$"+$mapArray(results,function(r){return r.id}).join(",")+"$"+variadic;var typ=$funcTypes[typeKey];if(typ===undefined){var paramTypes=$mapArray(params,function(p){return p.string});if(variadic){paramTypes[paramTypes.length-1]="..."+paramTypes[paramTypes.length-1].substr(2)}var string="func("+paramTypes.join(", ")+")";if(results.length===1){string+=" "+results[0].string}else if(results.length>1){string+=" ("+$mapArray(results,function(r){return r.string}).join(", ")+")"}typ=$newType(4,$kindFunc,string,false,"",false,null);$funcTypes[typeKey]=typ;typ.init(params,results,variadic)}return typ};var $interfaceTypes={};var $interfaceType=function(methods){var typeKey=$mapArray(methods,function(m){return m.pkg+","+m.name+","+m.typ.id}).join("$");var typ=$interfaceTypes[typeKey];if(typ===undefined){var string="interface {}";if(methods.length!==0){string="interface { "+$mapArray(methods,function(m){return(m.pkg!==""?m.pkg+".":"")+m.name+m.typ.string.substr(4)}).join("; ")+" }"}typ=$newType(8,$kindInterface,string,false,"",false,null);$interfaceTypes[typeKey]=typ;typ.init(methods)}return typ};var $emptyInterface=$interfaceType([]);var $ifaceNil={};var $error=$newType(8,$kindInterface,"error",true,"",false,null);$error.init([{prop:"Error",name:"Error",pkg:"",typ:$funcType([],[$String],false)}]);var $mapTypes={};var $mapType=function(key,elem){var typeKey=key.id+"$"+elem.id;var typ=$mapTypes[typeKey];if(typ===undefined){typ=$newType(4,$kindMap,"map["+key.string+"]"+elem.string,false,"",false,null);$mapTypes[typeKey]=typ;typ.init(key,elem)}return typ};var $makeMap=function(keyForFunc,entries){var m={};for(var i=0;i<entries.length;i++){var e=entries[i];m[keyForFunc(e.k)]=e}return m};var $ptrType=function(elem){var typ=elem.ptr;if(typ===undefined){typ=$newType(4,$kindPtr,"*"+elem.string,false,"",elem.exported,null);elem.ptr=typ;typ.init(elem)}return typ};var $newDataPointer=function(data,constructor){if(constructor.elem.kind===$kindStruct){return data}return new constructor(function(){return data},function(v){data=v})};var $indexPtr=function(array,index,constructor){array.$ptr=array.$ptr||{};return array.$ptr[index]||(array.$ptr[index]=new constructor(function(){return array[index]},function(v){array[index]=v}))};var $sliceType=function(elem){var typ=elem.slice;if(typ===undefined){typ=$newType(12,$kindSlice,"[]"+elem.string,false,"",false,null);elem.slice=typ;typ.init(elem)}return typ};var $makeSlice=function(typ,length,capacity){capacity=capacity||length;if(length<0||length>2147483647){$throwRuntimeError("makeslice: len out of range")}if(capacity<0||capacity<length||capacity>2147483647){$throwRuntimeError("makeslice: cap out of range")}var array=new typ.nativeArray(capacity);if(typ.nativeArray===Array){for(var i=0;i<capacity;i++){array[i]=typ.elem.zero()}}var slice=new typ(array);slice.$length=length;return slice};var $structTypes={};var $structType=function(pkgPath,fields){var typeKey=$mapArray(fields,function(f){return f.name+","+f.typ.id+","+f.tag}).join("$");var typ=$structTypes[typeKey];if(typ===undefined){var string="struct { "+$mapArray(fields,function(f){return f.name+" "+f.typ.string+(f.tag!==""?' "'+f.tag.replace(/\\/g,"\\\\").replace(/"/g,'\\"')+'"':"")}).join("; ")+" }";if(fields.length===0){string="struct {}"}typ=$newType(0,$kindStruct,string,false,"",false,function(){this.$val=this;for(var i=0;i<fields.length;i++){var f=fields[i];var arg=arguments[i];this[f.prop]=arg!==undefined?arg:f.typ.zero()}});$structTypes[typeKey]=typ;typ.init(pkgPath,fields)}return typ};var $assertType=function(value,type,returnTuple){var isInterface=type.kind===$kindInterface,ok,missingMethod="";if(value===$ifaceNil){ok=false}else if(!isInterface){ok=value.constructor===type}else{var valueTypeString=value.constructor.string;ok=type.implementedBy[valueTypeString];if(ok===undefined){ok=true;var valueMethodSet=$methodSet(value.constructor);var interfaceMethods=type.methods;for(var i=0;i<interfaceMethods.length;i++){var tm=interfaceMethods[i];var found=false;for(var j=0;j<valueMethodSet.length;j++){var vm=valueMethodSet[j];if(vm.name===tm.name&&vm.pkg===tm.pkg&&vm.typ===tm.typ){found=true;break}}if(!found){ok=false;type.missingMethodFor[valueTypeString]=tm.name;break}}type.implementedBy[valueTypeString]=ok}if(!ok){missingMethod=type.missingMethodFor[valueTypeString]}}if(!ok){if(returnTuple){return[type.zero(),false]}$panic(new $packages["runtime"].TypeAssertionError.ptr("",value===$ifaceNil?"":value.constructor.string,type.string,missingMethod))}if(!isInterface){value=value.$val}if(type===$jsObjectPtr){value=value.object}return returnTuple?[value,true]:value};var $stackDepthOffset=0;var $getStackDepth=function(){var err=new Error;if(err.stack===undefined){return undefined}return $stackDepthOffset+err.stack.split("\n").length};var $panicStackDepth=null,$panicValue;var $callDeferred=function(deferred,jsErr,fromPanic){if(!fromPanic&&deferred!==null&&deferred.index>=$curGoroutine.deferStack.length){throw jsErr}if(jsErr!==null){var newErr=null;try{$curGoroutine.deferStack.push(deferred);$panic(new $jsErrorPtr(jsErr))}catch(err){newErr=err}$curGoroutine.deferStack.pop();$callDeferred(deferred,newErr);return}if($curGoroutine.asleep){return}$stackDepthOffset--;var outerPanicStackDepth=$panicStackDepth;var outerPanicValue=$panicValue;var localPanicValue=$curGoroutine.panicStack.pop();if(localPanicValue!==undefined){$panicStackDepth=$getStackDepth();$panicValue=localPanicValue}try{while(true){if(deferred===null){deferred=$curGoroutine.deferStack[$curGoroutine.deferStack.length-1];if(deferred===undefined){$panicStackDepth=null;if(localPanicValue.Object instanceof Error){throw localPanicValue.Object}var msg;if(localPanicValue.constructor===$String){msg=localPanicValue.$val}else if(localPanicValue.Error!==undefined){msg=localPanicValue.Error()}else if(localPanicValue.String!==undefined){msg=localPanicValue.String()}else{msg=localPanicValue}throw new Error(msg)}}var call=deferred.pop();if(call===undefined){$curGoroutine.deferStack.pop();if(localPanicValue!==undefined){deferred=null;continue}return}var r=call[0].apply(call[2],call[1]);if(r&&r.$blk!==undefined){deferred.push([r.$blk,[],r]);if(fromPanic){throw null}return}if(localPanicValue!==undefined&&$panicStackDepth===null){throw null}}}finally{if(localPanicValue!==undefined){if($panicStackDepth!==null){$curGoroutine.panicStack.push(localPanicValue)}$panicStackDepth=outerPanicStackDepth;$panicValue=outerPanicValue}$stackDepthOffset++}};var $panic=function(value){$curGoroutine.panicStack.push(value);$callDeferred(null,null,true)};var $recover=function(){if($panicStackDepth===null||$panicStackDepth!==undefined&&$panicStackDepth!==$getStackDepth()-2){return $ifaceNil}$panicStackDepth=null;return $panicValue};var $throw=function(err){throw err};var $noGoroutine={asleep:false,exit:false,deferStack:[],panicStack:[]};var $curGoroutine=$noGoroutine,$totalGoroutines=0,$awakeGoroutines=0,$checkForDeadlock=true;var $mainFinished=false;var $go=function(fun,args){$totalGoroutines++;$awakeGoroutines++;var $goroutine=function(){try{$curGoroutine=$goroutine;var r=fun.apply(undefined,args);if(r&&r.$blk!==undefined){fun=function(){return r.$blk()};args=[];return}$goroutine.exit=true}catch(err){if(!$goroutine.exit){throw err}}finally{$curGoroutine=$noGoroutine;if($goroutine.exit){$totalGoroutines--;$goroutine.asleep=true}if($goroutine.asleep){$awakeGoroutines--;if(!$mainFinished&&$awakeGoroutines===0&&$checkForDeadlock){console.error("fatal error: all goroutines are asleep - deadlock!");if($global.process!==undefined){$global.process.exit(2)}}}}};$goroutine.asleep=false;$goroutine.exit=false;$goroutine.deferStack=[];$goroutine.panicStack=[];$schedule($goroutine)};var $scheduled=[];var $runScheduled=function(){try{var r;while((r=$scheduled.shift())!==undefined){r()}}finally{if($scheduled.length>0){setTimeout($runScheduled,0)}}};var $schedule=function(goroutine){if(goroutine.asleep){goroutine.asleep=false;$awakeGoroutines++}$scheduled.push(goroutine);if($curGoroutine===$noGoroutine){$runScheduled()}};var $setTimeout=function(f,t){$awakeGoroutines++;return setTimeout(function(){$awakeGoroutines--;f()},t)};var $block=function(){if($curGoroutine===$noGoroutine){$throwRuntimeError("cannot block in JavaScript callback, fix by wrapping code in goroutine")}$curGoroutine.asleep=true};var $send=function(chan,value){if(chan.$closed){$throwRuntimeError("send on closed channel")}var queuedRecv=chan.$recvQueue.shift();if(queuedRecv!==undefined){queuedRecv([value,true]);return}if(chan.$buffer.length<chan.$capacity){chan.$buffer.push(value);return}var thisGoroutine=$curGoroutine;var closedDuringSend;chan.$sendQueue.push(function(closed){closedDuringSend=closed;$schedule(thisGoroutine);return value});$block();return{$blk:function(){if(closedDuringSend){$throwRuntimeError("send on closed channel")}}}};var $recv=function(chan){var queuedSend=chan.$sendQueue.shift();if(queuedSend!==undefined){chan.$buffer.push(queuedSend(false))}var bufferedValue=chan.$buffer.shift();if(bufferedValue!==undefined){return[bufferedValue,true]}if(chan.$closed){return[chan.$elem.zero(),false]}var thisGoroutine=$curGoroutine;var f={$blk:function(){return this.value}};var queueEntry=function(v){f.value=v;$schedule(thisGoroutine)};chan.$recvQueue.push(queueEntry);$block();return f};var $close=function(chan){if(chan.$closed){$throwRuntimeError("close of closed channel")}chan.$closed=true;while(true){var queuedSend=chan.$sendQueue.shift();if(queuedSend===undefined){break}queuedSend(true)}while(true){var queuedRecv=chan.$recvQueue.shift();if(queuedRecv===undefined){break}queuedRecv([chan.$elem.zero(),false])}};var $select=function(comms){var ready=[];var selection=-1;for(var i=0;i<comms.length;i++){var comm=comms[i];var chan=comm[0];switch(comm.length){case 0:selection=i;break;case 1:if(chan.$sendQueue.length!==0||chan.$buffer.length!==0||chan.$closed){ready.push(i)}break;case 2:if(chan.$closed){$throwRuntimeError("send on closed channel")}if(chan.$recvQueue.length!==0||chan.$buffer.length<chan.$capacity){ready.push(i)}break}}if(ready.length!==0){selection=ready[Math.floor(Math.random()*ready.length)]}if(selection!==-1){var comm=comms[selection];switch(comm.length){case 0:return[selection];case 1:return[selection,$recv(comm[0])];case 2:$send(comm[0],comm[1]);return[selection]}}var entries=[];var thisGoroutine=$curGoroutine;var f={$blk:function(){return this.selection}};var removeFromQueues=function(){for(var i=0;i<entries.length;i++){var entry=entries[i];var queue=entry[0];var index=queue.indexOf(entry[1]);if(index!==-1){queue.splice(index,1)}}};for(var i=0;i<comms.length;i++){(function(i){var comm=comms[i];switch(comm.length){case 1:var queueEntry=function(value){f.selection=[i,value];removeFromQueues();$schedule(thisGoroutine)};entries.push([comm[0].$recvQueue,queueEntry]);comm[0].$recvQueue.push(queueEntry);break;case 2:var queueEntry=function(){if(comm[0].$closed){$throwRuntimeError("send on closed channel")}f.selection=[i];removeFromQueues();$schedule(thisGoroutine);return comm[1]};entries.push([comm[0].$sendQueue,queueEntry]);comm[0].$sendQueue.push(queueEntry);break}})(i)}$block();return f};var $jsObjectPtr,$jsErrorPtr;var $needsExternalization=function(t){switch(t.kind){case $kindBool:case $kindInt:case $kindInt8:case $kindInt16:case $kindInt32:case $kindUint:case $kindUint8:case $kindUint16:case $kindUint32:case $kindUintptr:case $kindFloat32:case $kindFloat64:return false;default:return t!==$jsObjectPtr}};var $externalize=function(v,t){if(t===$jsObjectPtr){return v}switch(t.kind){case $kindBool:case $kindInt:case $kindInt8:case $kindInt16:case $kindInt32:case $kindUint:case $kindUint8:case $kindUint16:case $kindUint32:case $kindUintptr:case $kindFloat32:case $kindFloat64:return v;case $kindInt64:case $kindUint64:return $flatten64(v);case $kindArray:if($needsExternalization(t.elem)){return $mapArray(v,function(e){return $externalize(e,t.elem)})}return v;case $kindFunc:return $externalizeFunction(v,t,false);case $kindInterface:if(v===$ifaceNil){return null}if(v.constructor===$jsObjectPtr){return v.$val.object}return $externalize(v.$val,v.constructor);case $kindMap:var m={};var keys=$keys(v);for(var i=0;i<keys.length;i++){var entry=v[keys[i]];m[$externalize(entry.k,t.key)]=$externalize(entry.v,t.elem)}return m;case $kindPtr:if(v===t.nil){return null}return $externalize(v.$get(),t.elem);case $kindSlice:if($needsExternalization(t.elem)){return $mapArray($sliceToArray(v),function(e){return $externalize(e,t.elem)})}return $sliceToArray(v);case $kindString:if($isASCII(v)){return v}var s="",r;for(var i=0;i<v.length;i+=r[1]){r=$decodeRune(v,i);var c=r[0];if(c>65535){var h=Math.floor((c-65536)/1024)+55296;var l=(c-65536)%1024+56320;s+=String.fromCharCode(h,l);continue}s+=String.fromCharCode(c)}return s;case $kindStruct:var timePkg=$packages["time"];if(timePkg!==undefined&&v.constructor===timePkg.Time.ptr){var milli=$div64(v.UnixNano(),new $Int64(0,1e6));return new Date($flatten64(milli))}var noJsObject={};var searchJsObject=function(v,t){if(t===$jsObjectPtr){return v}switch(t.kind){case $kindPtr:if(v===t.nil){return noJsObject}return searchJsObject(v.$get(),t.elem);case $kindStruct:var f=t.fields[0];return searchJsObject(v[f.prop],f.typ);case $kindInterface:return searchJsObject(v.$val,v.constructor);default:return noJsObject}};var o=searchJsObject(v,t);if(o!==noJsObject){return o}o={};for(var i=0;i<t.fields.length;i++){var f=t.fields[i];if(!f.exported){continue}o[f.name]=$externalize(v[f.prop],f.typ)}return o}$throwRuntimeError("cannot externalize "+t.string)};var $externalizeFunction=function(v,t,passThis){if(v===$throwNilPointerError){return null}if(v.$externalizeWrapper===undefined){$checkForDeadlock=false;v.$externalizeWrapper=function(){var args=[];for(var i=0;i<t.params.length;i++){if(t.variadic&&i===t.params.length-1){var vt=t.params[i].elem,varargs=[];for(var j=i;j<arguments.length;j++){varargs.push($internalize(arguments[j],vt))}args.push(new t.params[i](varargs));break}args.push($internalize(arguments[i],t.params[i]))}var result=v.apply(passThis?this:undefined,args);switch(t.results.length){case 0:return;case 1:return $externalize(result,t.results[0]);default:for(var i=0;i<t.results.length;i++){result[i]=$externalize(result[i],t.results[i])}return result}}}return v.$externalizeWrapper};var $internalize=function(v,t,recv){if(t===$jsObjectPtr){return v}if(t===$jsObjectPtr.elem){$throwRuntimeError("cannot internalize js.Object, use *js.Object instead")}if(v&&v.__internal_object__!==undefined){return $assertType(v.__internal_object__,t,false)}var timePkg=$packages["time"];if(timePkg!==undefined&&t===timePkg.Time){if(!(v!==null&&v!==undefined&&v.constructor===Date)){$throwRuntimeError("cannot internalize time.Time from "+typeof v+", must be Date")}return timePkg.Unix(new $Int64(0,0),new $Int64(0,v.getTime()*1e6))}switch(t.kind){case $kindBool:return!!v;case $kindInt:return parseInt(v);case $kindInt8:return parseInt(v)<<24>>24;case $kindInt16:return parseInt(v)<<16>>16;case $kindInt32:return parseInt(v)>>0;case $kindUint:return parseInt(v);case $kindUint8:return parseInt(v)<<24>>>24;case $kindUint16:return parseInt(v)<<16>>>16;case $kindUint32:case $kindUintptr:return parseInt(v)>>>0;case $kindInt64:case $kindUint64:return new t(0,v);case $kindFloat32:case $kindFloat64:return parseFloat(v);case $kindArray:if(v.length!==t.len){$throwRuntimeError("got array with wrong size from JavaScript native")}return $mapArray(v,function(e){return $internalize(e,t.elem)});case $kindFunc:return function(){var args=[];for(var i=0;i<t.params.length;i++){if(t.variadic&&i===t.params.length-1){var vt=t.params[i].elem,varargs=arguments[i];for(var j=0;j<varargs.$length;j++){args.push($externalize(varargs.$array[varargs.$offset+j],vt))}break}args.push($externalize(arguments[i],t.params[i]))}var result=v.apply(recv,args);switch(t.results.length){case 0:return;case 1:return $internalize(result,t.results[0]);default:for(var i=0;i<t.results.length;i++){result[i]=$internalize(result[i],t.results[i])}return result}};case $kindInterface:if(t.methods.length!==0){$throwRuntimeError("cannot internalize "+t.string)}if(v===null){return $ifaceNil}if(v===undefined){return new $jsObjectPtr(undefined)}switch(v.constructor){case Int8Array:return new($sliceType($Int8))(v);case Int16Array:return new($sliceType($Int16))(v);case Int32Array:return new($sliceType($Int))(v);case Uint8Array:return new($sliceType($Uint8))(v);case Uint16Array:return new($sliceType($Uint16))(v);case Uint32Array:return new($sliceType($Uint))(v);case Float32Array:return new($sliceType($Float32))(v);case Float64Array:return new($sliceType($Float64))(v);case Array:return $internalize(v,$sliceType($emptyInterface));case Boolean:return new $Bool(!!v);case Date:if(timePkg===undefined){return new $jsObjectPtr(v)}return new timePkg.Time($internalize(v,timePkg.Time));case Function:var funcType=$funcType([$sliceType($emptyInterface)],[$jsObjectPtr],true);return new funcType($internalize(v,funcType));case Number:return new $Float64(parseFloat(v));case String:return new $String($internalize(v,$String));default:if($global.Node&&v instanceof $global.Node){return new $jsObjectPtr(v)}var mapType=$mapType($String,$emptyInterface);return new mapType($internalize(v,mapType))}case $kindMap:var m={};var keys=$keys(v);for(var i=0;i<keys.length;i++){var k=$internalize(keys[i],t.key);m[t.key.keyFor(k)]={k:k,v:$internalize(v[keys[i]],t.elem)}}return m;case $kindPtr:if(t.elem.kind===$kindStruct){return $internalize(v,t.elem)}case $kindSlice:return new t($mapArray(v,function(e){return $internalize(e,t.elem)}));case $kindString:v=String(v);if($isASCII(v)){return v}var s="";var i=0;while(i<v.length){var h=v.charCodeAt(i);if(55296<=h&&h<=56319){var l=v.charCodeAt(i+1);var c=(h-55296)*1024+l-56320+65536;s+=$encodeRune(c);i+=2;continue}s+=$encodeRune(h);i++}return s;case $kindStruct:var noJsObject={};var searchJsObject=function(t){if(t===$jsObjectPtr){return v}if(t===$jsObjectPtr.elem){$throwRuntimeError("cannot internalize js.Object, use *js.Object instead")}switch(t.kind){case $kindPtr:return searchJsObject(t.elem);case $kindStruct:var f=t.fields[0];var o=searchJsObject(f.typ);if(o!==noJsObject){var n=new t.ptr;n[f.prop]=o;return n}return noJsObject;default:return noJsObject}};var o=searchJsObject(t);if(o!==noJsObject){return o}}$throwRuntimeError("cannot internalize "+t.string)};var $isASCII=function(s){for(var i=0;i<s.length;i++){if(s.charCodeAt(i)>=128){return false}}return true};
+`
diff --git a/compiler/prelude/regen.go b/compiler/prelude/regen.go
new file mode 100644
index 000000000..af0fda38b
--- /dev/null
+++ b/compiler/prelude/regen.go
@@ -0,0 +1,34 @@
+// +build ignore
+
+package main
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"strings"
+
+	"github.com/gopherjs/gopherjs/compiler/prelude"
+)
+
+func main() {
+	cmd := exec.Command("uglifyjs")
+	cmd.Stdin = strings.NewReader(prelude.Prelude)
+
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		log.Fatalf("uglifyjs: %v\n%s", err, out)
+		os.Exit(1)
+	}
+
+	err = ioutil.WriteFile("prelude_min.go", []byte(`// Code generated by regen. DO NOT EDIT.
+
+package prelude
+
+const Minified = `+"`"+string(out)+"`\n"), 0644)
+
+	if err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 000000000..7b2b25883
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,32 @@
+{
+  "name": "gopherjs",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "uglify-es": {
+      "version": "3.3.9",
+      "resolved": "https://registry.npmjs.org/uglify-es/-/uglify-es-3.3.9.tgz",
+      "integrity": "sha512-r+MU0rfv4L/0eeW3xZrd16t4NZfK8Ld4SWVglYBb7ez5uXFWHuVRs6xCTrf1yirs9a4j4Y27nn7SRfO6v67XsQ==",
+      "dev": true,
+      "requires": {
+        "commander": "2.13.0",
+        "source-map": "0.6.1"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "2.13.0",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.13.0.tgz",
+          "integrity": "sha512-MVuS359B+YzaWqjCL/c+22gfryv+mCBPHAv3zyVI2GN8EY6IRP8VwtasXn8jyyhvvq84R4ImN1OKRtcbIasjYA==",
+          "dev": true
+        },
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 000000000..e4730d0cb
--- /dev/null
+++ b/package.json
@@ -0,0 +1,6 @@
+{
+  "name": "gopherjs",
+  "devDependencies": {
+    "uglify-es": "^3.3.9"
+  }
+}