diff --git a/build/webp-shim/Makefile b/build/webp-shim/Makefile
index a29e5c1..1557315 100644
--- a/build/webp-shim/Makefile
+++ b/build/webp-shim/Makefile
@@ -12,12 +12,15 @@ debug: ${OUT_TARGET}
 clean:
 	rm -rf ${OUT_PATH}/${OUT_NAME}.*
 
-${OUT_TARGET}: ${SHIM_SRC}
-	emcc -O3 \
+# Debug:
+# -O0
+# Optimizations:
+# -Os --llvm-lto 1
+${OUT_TARGET}: ${SHIM_SRC} Makefile
+	emcc -Os --llvm-lto 1 \
 		-s WASM=1 \
 		-s EXTRA_EXPORTED_RUNTIME_METHODS='["cwrap"]' \
 		-s ALLOW_MEMORY_GROWTH=1 \
-		-s ASSERTIONS=1 \
 		-I stb \
 		-I libwebp \
 		${LIBWEBP_SRC} \
diff --git a/build/webp-shim/src/webp.c b/build/webp-shim/src/webp.c
index 312c2b7..564d8b2 100644
--- a/build/webp-shim/src/webp.c
+++ b/build/webp-shim/src/webp.c
@@ -63,7 +63,7 @@ void write_image_to_mem(void* context, void* data, int size) {
 
 uint8_t* decode_webp_to_rgba(uint8_t* webp_ptr, size_t size, int* width, int* height) {
   if (!webp_ptr) {
-    printf("webp_ptr is NULL");
+    printf("decode_webp_to_rgba() called with NULL webp_ptr");
   }
   if (!WebPGetInfo(webp_ptr, size, width, height)) {
     fprintf(stderr, "WebPGetInfo() returned an error\n");
diff --git a/image/webp-shim/webp-shim-module.js b/image/webp-shim/webp-shim-module.js
index b7633d6..aa82b5b 100644
--- a/image/webp-shim/webp-shim-module.js
+++ b/image/webp-shim/webp-shim-module.js
@@ -1 +1 @@
-var Module=typeof Module!=="undefined"?Module:{};var moduleOverrides={};var key;for(key in Module){if(Module.hasOwnProperty(key)){moduleOverrides[key]=Module[key]}}var arguments_=[];var thisProgram="./this.program";var quit_=function(status,toThrow){throw toThrow};var ENVIRONMENT_IS_WEB=false;var ENVIRONMENT_IS_WORKER=false;var ENVIRONMENT_IS_NODE=false;var ENVIRONMENT_IS_SHELL=false;ENVIRONMENT_IS_WEB=typeof window==="object";ENVIRONMENT_IS_WORKER=typeof importScripts==="function";ENVIRONMENT_IS_NODE=typeof process==="object"&&typeof process.versions==="object"&&typeof process.versions.node==="string";ENVIRONMENT_IS_SHELL=!ENVIRONMENT_IS_WEB&&!ENVIRONMENT_IS_NODE&&!ENVIRONMENT_IS_WORKER;if(Module["ENVIRONMENT"]){throw new Error("Module.ENVIRONMENT has been deprecated. To force the environment, use the ENVIRONMENT compile-time option (for example, -s ENVIRONMENT=web or -s ENVIRONMENT=node)")}var scriptDirectory="";function locateFile(path){if(Module["locateFile"]){return Module["locateFile"](path,scriptDirectory)}return scriptDirectory+path}var read_,readAsync,readBinary,setWindowTitle;var nodeFS;var nodePath;if(ENVIRONMENT_IS_NODE){if(ENVIRONMENT_IS_WORKER){scriptDirectory=require("path").dirname(scriptDirectory)+"/"}else{scriptDirectory=__dirname+"/"}read_=function shell_read(filename,binary){if(!nodeFS)nodeFS=require("fs");if(!nodePath)nodePath=require("path");filename=nodePath["normalize"](filename);return nodeFS["readFileSync"](filename,binary?null:"utf8")};readBinary=function readBinary(filename){var ret=read_(filename,true);if(!ret.buffer){ret=new Uint8Array(ret)}assert(ret.buffer);return ret};if(process["argv"].length>1){thisProgram=process["argv"][1].replace(/\\/g,"/")}arguments_=process["argv"].slice(2);if(typeof module!=="undefined"){module["exports"]=Module}process["on"]("uncaughtException",function(ex){if(!(ex instanceof ExitStatus)){throw ex}});process["on"]("unhandledRejection",abort);quit_=function(status){process["exit"](status)};Module["inspect"]=function(){return"[Emscripten Module object]"}}else if(ENVIRONMENT_IS_SHELL){if(typeof read!="undefined"){read_=function shell_read(f){return read(f)}}readBinary=function readBinary(f){var data;if(typeof readbuffer==="function"){return new Uint8Array(readbuffer(f))}data=read(f,"binary");assert(typeof data==="object");return data};if(typeof scriptArgs!="undefined"){arguments_=scriptArgs}else if(typeof arguments!="undefined"){arguments_=arguments}if(typeof quit==="function"){quit_=function(status){quit(status)}}if(typeof print!=="undefined"){if(typeof console==="undefined")console={};console.log=print;console.warn=console.error=typeof printErr!=="undefined"?printErr:print}}else if(ENVIRONMENT_IS_WEB||ENVIRONMENT_IS_WORKER){if(ENVIRONMENT_IS_WORKER){scriptDirectory=self.location.href}else if(document.currentScript){scriptDirectory=document.currentScript.src}if(scriptDirectory.indexOf("blob:")!==0){scriptDirectory=scriptDirectory.substr(0,scriptDirectory.lastIndexOf("/")+1)}else{scriptDirectory=""}{read_=function shell_read(url){var xhr=new XMLHttpRequest;xhr.open("GET",url,false);xhr.send(null);return xhr.responseText};if(ENVIRONMENT_IS_WORKER){readBinary=function readBinary(url){var xhr=new XMLHttpRequest;xhr.open("GET",url,false);xhr.responseType="arraybuffer";xhr.send(null);return new Uint8Array(xhr.response)}}readAsync=function readAsync(url,onload,onerror){var xhr=new XMLHttpRequest;xhr.open("GET",url,true);xhr.responseType="arraybuffer";xhr.onload=function xhr_onload(){if(xhr.status==200||xhr.status==0&&xhr.response){onload(xhr.response);return}onerror()};xhr.onerror=onerror;xhr.send(null)}}setWindowTitle=function(title){document.title=title}}else{throw new Error("environment detection error")}var out=Module["print"]||console.log.bind(console);var err=Module["printErr"]||console.warn.bind(console);for(key in moduleOverrides){if(moduleOverrides.hasOwnProperty(key)){Module[key]=moduleOverrides[key]}}moduleOverrides=null;if(Module["arguments"])arguments_=Module["arguments"];if(!Object.getOwnPropertyDescriptor(Module,"arguments"))Object.defineProperty(Module,"arguments",{configurable:true,get:function(){abort("Module.arguments has been replaced with plain arguments_")}});if(Module["thisProgram"])thisProgram=Module["thisProgram"];if(!Object.getOwnPropertyDescriptor(Module,"thisProgram"))Object.defineProperty(Module,"thisProgram",{configurable:true,get:function(){abort("Module.thisProgram has been replaced with plain thisProgram")}});if(Module["quit"])quit_=Module["quit"];if(!Object.getOwnPropertyDescriptor(Module,"quit"))Object.defineProperty(Module,"quit",{configurable:true,get:function(){abort("Module.quit has been replaced with plain quit_")}});assert(typeof Module["memoryInitializerPrefixURL"]==="undefined","Module.memoryInitializerPrefixURL option was removed, use Module.locateFile instead");assert(typeof Module["pthreadMainPrefixURL"]==="undefined","Module.pthreadMainPrefixURL option was removed, use Module.locateFile instead");assert(typeof Module["cdInitializerPrefixURL"]==="undefined","Module.cdInitializerPrefixURL option was removed, use Module.locateFile instead");assert(typeof Module["filePackagePrefixURL"]==="undefined","Module.filePackagePrefixURL option was removed, use Module.locateFile instead");assert(typeof Module["read"]==="undefined","Module.read option was removed (modify read_ in JS)");assert(typeof Module["readAsync"]==="undefined","Module.readAsync option was removed (modify readAsync in JS)");assert(typeof Module["readBinary"]==="undefined","Module.readBinary option was removed (modify readBinary in JS)");assert(typeof Module["setWindowTitle"]==="undefined","Module.setWindowTitle option was removed (modify setWindowTitle in JS)");assert(typeof Module["TOTAL_MEMORY"]==="undefined","Module.TOTAL_MEMORY has been renamed Module.INITIAL_MEMORY");if(!Object.getOwnPropertyDescriptor(Module,"read"))Object.defineProperty(Module,"read",{configurable:true,get:function(){abort("Module.read has been replaced with plain read_")}});if(!Object.getOwnPropertyDescriptor(Module,"readAsync"))Object.defineProperty(Module,"readAsync",{configurable:true,get:function(){abort("Module.readAsync has been replaced with plain readAsync")}});if(!Object.getOwnPropertyDescriptor(Module,"readBinary"))Object.defineProperty(Module,"readBinary",{configurable:true,get:function(){abort("Module.readBinary has been replaced with plain readBinary")}});var stackSave;var stackRestore;var stackAlloc;stackSave=stackRestore=stackAlloc=function(){abort("cannot use the stack before compiled code is ready to run, and has provided stack access")};function warnOnce(text){if(!warnOnce.shown)warnOnce.shown={};if(!warnOnce.shown[text]){warnOnce.shown[text]=1;err(text)}}var wasmBinary;if(Module["wasmBinary"])wasmBinary=Module["wasmBinary"];if(!Object.getOwnPropertyDescriptor(Module,"wasmBinary"))Object.defineProperty(Module,"wasmBinary",{configurable:true,get:function(){abort("Module.wasmBinary has been replaced with plain wasmBinary")}});var noExitRuntime;if(Module["noExitRuntime"])noExitRuntime=Module["noExitRuntime"];if(!Object.getOwnPropertyDescriptor(Module,"noExitRuntime"))Object.defineProperty(Module,"noExitRuntime",{configurable:true,get:function(){abort("Module.noExitRuntime has been replaced with plain noExitRuntime")}});if(typeof WebAssembly!=="object"){abort("No WebAssembly support found. Build with -s WASM=0 to target JavaScript instead.")}var wasmMemory;var wasmTable=new WebAssembly.Table({"initial":163,"maximum":163+0,"element":"anyfunc"});var ABORT=false;var EXITSTATUS=0;function assert(condition,text){if(!condition){abort("Assertion failed: "+text)}}function getCFunc(ident){var func=Module["_"+ident];assert(func,"Cannot call unknown function "+ident+", make sure it is exported");return func}function ccall(ident,returnType,argTypes,args,opts){var toC={"string":function(str){var ret=0;if(str!==null&&str!==undefined&&str!==0){var len=(str.length<<2)+1;ret=stackAlloc(len);stringToUTF8(str,ret,len)}return ret},"array":function(arr){var ret=stackAlloc(arr.length);writeArrayToMemory(arr,ret);return ret}};function convertReturnValue(ret){if(returnType==="string")return UTF8ToString(ret);if(returnType==="boolean")return Boolean(ret);return ret}var func=getCFunc(ident);var cArgs=[];var stack=0;assert(returnType!=="array",'Return type should not be "array".');if(args){for(var i=0;i<args.length;i++){var converter=toC[argTypes[i]];if(converter){if(stack===0)stack=stackSave();cArgs[i]=converter(args[i])}else{cArgs[i]=args[i]}}}var ret=func.apply(null,cArgs);ret=convertReturnValue(ret);if(stack!==0)stackRestore(stack);return ret}function cwrap(ident,returnType,argTypes,opts){return function(){return ccall(ident,returnType,argTypes,arguments,opts)}}var UTF8Decoder=typeof TextDecoder!=="undefined"?new TextDecoder("utf8"):undefined;function UTF8ArrayToString(u8Array,idx,maxBytesToRead){var endIdx=idx+maxBytesToRead;var endPtr=idx;while(u8Array[endPtr]&&!(endPtr>=endIdx))++endPtr;if(endPtr-idx>16&&u8Array.subarray&&UTF8Decoder){return UTF8Decoder.decode(u8Array.subarray(idx,endPtr))}else{var str="";while(idx<endPtr){var u0=u8Array[idx++];if(!(u0&128)){str+=String.fromCharCode(u0);continue}var u1=u8Array[idx++]&63;if((u0&224)==192){str+=String.fromCharCode((u0&31)<<6|u1);continue}var u2=u8Array[idx++]&63;if((u0&240)==224){u0=(u0&15)<<12|u1<<6|u2}else{if((u0&248)!=240)warnOnce("Invalid UTF-8 leading byte 0x"+u0.toString(16)+" encountered when deserializing a UTF-8 string on the asm.js/wasm heap to a JS string!");u0=(u0&7)<<18|u1<<12|u2<<6|u8Array[idx++]&63}if(u0<65536){str+=String.fromCharCode(u0)}else{var ch=u0-65536;str+=String.fromCharCode(55296|ch>>10,56320|ch&1023)}}}return str}function UTF8ToString(ptr,maxBytesToRead){return ptr?UTF8ArrayToString(HEAPU8,ptr,maxBytesToRead):""}function stringToUTF8Array(str,outU8Array,outIdx,maxBytesToWrite){if(!(maxBytesToWrite>0))return 0;var startIdx=outIdx;var endIdx=outIdx+maxBytesToWrite-1;for(var i=0;i<str.length;++i){var u=str.charCodeAt(i);if(u>=55296&&u<=57343){var u1=str.charCodeAt(++i);u=65536+((u&1023)<<10)|u1&1023}if(u<=127){if(outIdx>=endIdx)break;outU8Array[outIdx++]=u}else if(u<=2047){if(outIdx+1>=endIdx)break;outU8Array[outIdx++]=192|u>>6;outU8Array[outIdx++]=128|u&63}else if(u<=65535){if(outIdx+2>=endIdx)break;outU8Array[outIdx++]=224|u>>12;outU8Array[outIdx++]=128|u>>6&63;outU8Array[outIdx++]=128|u&63}else{if(outIdx+3>=endIdx)break;if(u>=2097152)warnOnce("Invalid Unicode code point 0x"+u.toString(16)+" encountered when serializing a JS string to an UTF-8 string on the asm.js/wasm heap! (Valid unicode code points should be in range 0-0x1FFFFF).");outU8Array[outIdx++]=240|u>>18;outU8Array[outIdx++]=128|u>>12&63;outU8Array[outIdx++]=128|u>>6&63;outU8Array[outIdx++]=128|u&63}}outU8Array[outIdx]=0;return outIdx-startIdx}function stringToUTF8(str,outPtr,maxBytesToWrite){assert(typeof maxBytesToWrite=="number","stringToUTF8(str, outPtr, maxBytesToWrite) is missing the third parameter that specifies the length of the output buffer!");return stringToUTF8Array(str,HEAPU8,outPtr,maxBytesToWrite)}var UTF16Decoder=typeof TextDecoder!=="undefined"?new TextDecoder("utf-16le"):undefined;function writeArrayToMemory(array,buffer){assert(array.length>=0,"writeArrayToMemory array must have a length (should be an array or typed array)");HEAP8.set(array,buffer)}var WASM_PAGE_SIZE=65536;function alignUp(x,multiple){if(x%multiple>0){x+=multiple-x%multiple}return x}var buffer,HEAP8,HEAPU8,HEAP16,HEAPU16,HEAP32,HEAPU32,HEAPF32,HEAPF64;function updateGlobalBufferAndViews(buf){buffer=buf;Module["HEAP8"]=HEAP8=new Int8Array(buf);Module["HEAP16"]=HEAP16=new Int16Array(buf);Module["HEAP32"]=HEAP32=new Int32Array(buf);Module["HEAPU8"]=HEAPU8=new Uint8Array(buf);Module["HEAPU16"]=HEAPU16=new Uint16Array(buf);Module["HEAPU32"]=HEAPU32=new Uint32Array(buf);Module["HEAPF32"]=HEAPF32=new Float32Array(buf);Module["HEAPF64"]=HEAPF64=new Float64Array(buf)}var STACK_BASE=5268496,STACK_MAX=25616,DYNAMIC_BASE=5268496,DYNAMICTOP_PTR=25456;assert(STACK_BASE%16===0,"stack must start aligned");assert(DYNAMIC_BASE%16===0,"heap must start aligned");var TOTAL_STACK=5242880;if(Module["TOTAL_STACK"])assert(TOTAL_STACK===Module["TOTAL_STACK"],"the stack size can no longer be determined at runtime");var INITIAL_INITIAL_MEMORY=Module["INITIAL_MEMORY"]||16777216;if(!Object.getOwnPropertyDescriptor(Module,"INITIAL_MEMORY"))Object.defineProperty(Module,"INITIAL_MEMORY",{configurable:true,get:function(){abort("Module.INITIAL_MEMORY has been replaced with plain INITIAL_INITIAL_MEMORY")}});assert(INITIAL_INITIAL_MEMORY>=TOTAL_STACK,"INITIAL_MEMORY should be larger than TOTAL_STACK, was "+INITIAL_INITIAL_MEMORY+"! (TOTAL_STACK="+TOTAL_STACK+")");assert(typeof Int32Array!=="undefined"&&typeof Float64Array!=="undefined"&&Int32Array.prototype.subarray!==undefined&&Int32Array.prototype.set!==undefined,"JS engine does not provide full typed array support");if(Module["wasmMemory"]){wasmMemory=Module["wasmMemory"]}else{wasmMemory=new WebAssembly.Memory({"initial":INITIAL_INITIAL_MEMORY/WASM_PAGE_SIZE})}if(wasmMemory){buffer=wasmMemory.buffer}INITIAL_INITIAL_MEMORY=buffer.byteLength;assert(INITIAL_INITIAL_MEMORY%WASM_PAGE_SIZE===0);updateGlobalBufferAndViews(buffer);HEAP32[DYNAMICTOP_PTR>>2]=DYNAMIC_BASE;function writeStackCookie(){assert((STACK_MAX&3)==0);HEAPU32[(STACK_MAX>>2)+1]=34821223;HEAPU32[(STACK_MAX>>2)+2]=2310721022;HEAP32[0]=1668509029}function checkStackCookie(){var cookie1=HEAPU32[(STACK_MAX>>2)+1];var cookie2=HEAPU32[(STACK_MAX>>2)+2];if(cookie1!=34821223||cookie2!=2310721022){abort("Stack overflow! Stack cookie has been overwritten, expected hex dwords 0x89BACDFE and 0x2135467, but received 0x"+cookie2.toString(16)+" "+cookie1.toString(16))}if(HEAP32[0]!==1668509029)abort("Runtime error: The application has corrupted its heap memory area (address zero)!")}function abortStackOverflow(allocSize){abort("Stack overflow! Attempted to allocate "+allocSize+" bytes on the stack, but stack has only "+(STACK_MAX-stackSave()+allocSize)+" bytes available!")}(function(){var h16=new Int16Array(1);var h8=new Int8Array(h16.buffer);h16[0]=25459;if(h8[0]!==115||h8[1]!==99)throw"Runtime error: expected the system to be little-endian!"})();function callRuntimeCallbacks(callbacks){while(callbacks.length>0){var callback=callbacks.shift();if(typeof callback=="function"){callback();continue}var func=callback.func;if(typeof func==="number"){if(callback.arg===undefined){Module["dynCall_v"](func)}else{Module["dynCall_vi"](func,callback.arg)}}else{func(callback.arg===undefined?null:callback.arg)}}}var __ATPRERUN__=[];var __ATINIT__=[];var __ATMAIN__=[];var __ATPOSTRUN__=[];var runtimeInitialized=false;var runtimeExited=false;function preRun(){if(Module["preRun"]){if(typeof Module["preRun"]=="function")Module["preRun"]=[Module["preRun"]];while(Module["preRun"].length){addOnPreRun(Module["preRun"].shift())}}callRuntimeCallbacks(__ATPRERUN__)}function initRuntime(){checkStackCookie();assert(!runtimeInitialized);runtimeInitialized=true;callRuntimeCallbacks(__ATINIT__)}function preMain(){checkStackCookie();callRuntimeCallbacks(__ATMAIN__)}function postRun(){checkStackCookie();if(Module["postRun"]){if(typeof Module["postRun"]=="function")Module["postRun"]=[Module["postRun"]];while(Module["postRun"].length){addOnPostRun(Module["postRun"].shift())}}callRuntimeCallbacks(__ATPOSTRUN__)}function addOnPreRun(cb){__ATPRERUN__.unshift(cb)}function addOnPostRun(cb){__ATPOSTRUN__.unshift(cb)}assert(Math.imul,"This browser does not support Math.imul(), build with LEGACY_VM_SUPPORT or POLYFILL_OLD_MATH_FUNCTIONS to add in a polyfill");assert(Math.fround,"This browser does not support Math.fround(), build with LEGACY_VM_SUPPORT or POLYFILL_OLD_MATH_FUNCTIONS to add in a polyfill");assert(Math.clz32,"This browser does not support Math.clz32(), build with LEGACY_VM_SUPPORT or POLYFILL_OLD_MATH_FUNCTIONS to add in a polyfill");assert(Math.trunc,"This browser does not support Math.trunc(), build with LEGACY_VM_SUPPORT or POLYFILL_OLD_MATH_FUNCTIONS to add in a polyfill");var runDependencies=0;var runDependencyWatcher=null;var dependenciesFulfilled=null;var runDependencyTracking={};function addRunDependency(id){runDependencies++;if(Module["monitorRunDependencies"]){Module["monitorRunDependencies"](runDependencies)}if(id){assert(!runDependencyTracking[id]);runDependencyTracking[id]=1;if(runDependencyWatcher===null&&typeof setInterval!=="undefined"){runDependencyWatcher=setInterval(function(){if(ABORT){clearInterval(runDependencyWatcher);runDependencyWatcher=null;return}var shown=false;for(var dep in runDependencyTracking){if(!shown){shown=true;err("still waiting on run dependencies:")}err("dependency: "+dep)}if(shown){err("(end of list)")}},1e4)}}else{err("warning: run dependency added without ID")}}function removeRunDependency(id){runDependencies--;if(Module["monitorRunDependencies"]){Module["monitorRunDependencies"](runDependencies)}if(id){assert(runDependencyTracking[id]);delete runDependencyTracking[id]}else{err("warning: run dependency removed without ID")}if(runDependencies==0){if(runDependencyWatcher!==null){clearInterval(runDependencyWatcher);runDependencyWatcher=null}if(dependenciesFulfilled){var callback=dependenciesFulfilled;dependenciesFulfilled=null;callback()}}}Module["preloadedImages"]={};Module["preloadedAudios"]={};function abort(what){if(Module["onAbort"]){Module["onAbort"](what)}what+="";out(what);err(what);ABORT=true;EXITSTATUS=1;var output="abort("+what+") at "+stackTrace();what=output;throw new WebAssembly.RuntimeError(what)}var FS={error:function(){abort("Filesystem support (FS) was not included. The problem is that you are using files from JS, but files were not used from C/C++, so filesystem support was not auto-included. You can force-include filesystem support with  -s FORCE_FILESYSTEM=1")},init:function(){FS.error()},createDataFile:function(){FS.error()},createPreloadedFile:function(){FS.error()},createLazyFile:function(){FS.error()},open:function(){FS.error()},mkdev:function(){FS.error()},registerDevice:function(){FS.error()},analyzePath:function(){FS.error()},loadFilesFromDB:function(){FS.error()},ErrnoError:function ErrnoError(){FS.error()}};Module["FS_createDataFile"]=FS.createDataFile;Module["FS_createPreloadedFile"]=FS.createPreloadedFile;var dataURIPrefix="data:application/octet-stream;base64,";function isDataURI(filename){return String.prototype.startsWith?filename.startsWith(dataURIPrefix):filename.indexOf(dataURIPrefix)===0}var wasmBinaryFile="webp-shim-module.wasm";if(!isDataURI(wasmBinaryFile)){wasmBinaryFile=locateFile(wasmBinaryFile)}function getBinary(){try{if(wasmBinary){return new Uint8Array(wasmBinary)}if(readBinary){return readBinary(wasmBinaryFile)}else{throw"both async and sync fetching of the wasm failed"}}catch(err){abort(err)}}function getBinaryPromise(){if(!wasmBinary&&(ENVIRONMENT_IS_WEB||ENVIRONMENT_IS_WORKER)&&typeof fetch==="function"){return fetch(wasmBinaryFile,{credentials:"same-origin"}).then(function(response){if(!response["ok"]){throw"failed to load wasm binary file at '"+wasmBinaryFile+"'"}return response["arrayBuffer"]()}).catch(function(){return getBinary()})}return new Promise(function(resolve,reject){resolve(getBinary())})}function createWasm(){var info={"env":asmLibraryArg,"wasi_snapshot_preview1":asmLibraryArg};function receiveInstance(instance,module){var exports=instance.exports;Module["asm"]=exports;removeRunDependency("wasm-instantiate")}addRunDependency("wasm-instantiate");var trueModule=Module;function receiveInstantiatedSource(output){assert(Module===trueModule,"the Module object should not be replaced during async compilation - perhaps the order of HTML elements is wrong?");trueModule=null;receiveInstance(output["instance"])}function instantiateArrayBuffer(receiver){return getBinaryPromise().then(function(binary){return WebAssembly.instantiate(binary,info)}).then(receiver,function(reason){err("failed to asynchronously prepare wasm: "+reason);abort(reason)})}function instantiateAsync(){if(!wasmBinary&&typeof WebAssembly.instantiateStreaming==="function"&&!isDataURI(wasmBinaryFile)&&typeof fetch==="function"){fetch(wasmBinaryFile,{credentials:"same-origin"}).then(function(response){var result=WebAssembly.instantiateStreaming(response,info);return result.then(receiveInstantiatedSource,function(reason){err("wasm streaming compile failed: "+reason);err("falling back to ArrayBuffer instantiation");instantiateArrayBuffer(receiveInstantiatedSource)})})}else{return instantiateArrayBuffer(receiveInstantiatedSource)}}if(Module["instantiateWasm"]){try{var exports=Module["instantiateWasm"](info,receiveInstance);return exports}catch(e){err("Module.instantiateWasm callback failed with error: "+e);return false}}instantiateAsync();return{}}__ATINIT__.push({func:function(){___wasm_call_ctors()}});function demangle(func){warnOnce("warning: build with  -s DEMANGLE_SUPPORT=1  to link in libcxxabi demangling");return func}function demangleAll(text){var regex=/\b_Z[\w\d_]+/g;return text.replace(regex,function(x){var y=demangle(x);return x===y?x:y+" ["+x+"]"})}function jsStackTrace(){var err=new Error;if(!err.stack){try{throw new Error}catch(e){err=e}if(!err.stack){return"(no stack trace available)"}}return err.stack.toString()}function stackTrace(){var js=jsStackTrace();if(Module["extraStackTrace"])js+="\n"+Module["extraStackTrace"]();return demangleAll(js)}function ___assert_fail(condition,filename,line,func){abort("Assertion failed: "+UTF8ToString(condition)+", at: "+[filename?UTF8ToString(filename):"unknown filename",line,func?UTF8ToString(func):"unknown function"])}function ___handle_stack_overflow(){abort("stack overflow")}function _emscripten_get_heap_size(){return HEAPU8.length}function _emscripten_memcpy_big(dest,src,num){HEAPU8.copyWithin(dest,src,src+num)}function emscripten_realloc_buffer(size){try{wasmMemory.grow(size-buffer.byteLength+65535>>16);updateGlobalBufferAndViews(wasmMemory.buffer);return 1}catch(e){console.error("emscripten_realloc_buffer: Attempted to grow heap from "+buffer.byteLength+" bytes to "+size+" bytes, but got error: "+e)}}function _emscripten_resize_heap(requestedSize){var oldSize=_emscripten_get_heap_size();assert(requestedSize>oldSize);var PAGE_MULTIPLE=65536;var maxHeapSize=2147483648-PAGE_MULTIPLE;if(requestedSize>maxHeapSize){err("Cannot enlarge memory, asked to go up to "+requestedSize+" bytes, but the limit is "+maxHeapSize+" bytes!");return false}var minHeapSize=16777216;for(var cutDown=1;cutDown<=4;cutDown*=2){var overGrownHeapSize=oldSize*(1+.2/cutDown);overGrownHeapSize=Math.min(overGrownHeapSize,requestedSize+100663296);var newSize=Math.min(maxHeapSize,alignUp(Math.max(minHeapSize,requestedSize,overGrownHeapSize),PAGE_MULTIPLE));var replacement=emscripten_realloc_buffer(newSize);if(replacement){return true}}err("Failed to grow the heap from "+oldSize+" bytes to "+newSize+" bytes, not enough memory!");return false}var PATH={splitPath:function(filename){var splitPathRe=/^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;return splitPathRe.exec(filename).slice(1)},normalizeArray:function(parts,allowAboveRoot){var up=0;for(var i=parts.length-1;i>=0;i--){var last=parts[i];if(last==="."){parts.splice(i,1)}else if(last===".."){parts.splice(i,1);up++}else if(up){parts.splice(i,1);up--}}if(allowAboveRoot){for(;up;up--){parts.unshift("..")}}return parts},normalize:function(path){var isAbsolute=path.charAt(0)==="/",trailingSlash=path.substr(-1)==="/";path=PATH.normalizeArray(path.split("/").filter(function(p){return!!p}),!isAbsolute).join("/");if(!path&&!isAbsolute){path="."}if(path&&trailingSlash){path+="/"}return(isAbsolute?"/":"")+path},dirname:function(path){var result=PATH.splitPath(path),root=result[0],dir=result[1];if(!root&&!dir){return"."}if(dir){dir=dir.substr(0,dir.length-1)}return root+dir},basename:function(path){if(path==="/")return"/";var lastSlash=path.lastIndexOf("/");if(lastSlash===-1)return path;return path.substr(lastSlash+1)},extname:function(path){return PATH.splitPath(path)[3]},join:function(){var paths=Array.prototype.slice.call(arguments,0);return PATH.normalize(paths.join("/"))},join2:function(l,r){return PATH.normalize(l+"/"+r)}};var SYSCALLS={mappings:{},buffers:[null,[],[]],printChar:function(stream,curr){var buffer=SYSCALLS.buffers[stream];assert(buffer);if(curr===0||curr===10){(stream===1?out:err)(UTF8ArrayToString(buffer,0));buffer.length=0}else{buffer.push(curr)}},varargs:undefined,get:function(){assert(SYSCALLS.varargs!=undefined);SYSCALLS.varargs+=4;var ret=HEAP32[SYSCALLS.varargs-4>>2];return ret},getStr:function(ptr){var ret=UTF8ToString(ptr);return ret},get64:function(low,high){if(low>=0)assert(high===0);else assert(high===-1);return low}};function _fd_close(fd){abort("it should not be possible to operate on streams when !SYSCALLS_REQUIRE_FILESYSTEM");return 0}function _fd_seek(fd,offset_low,offset_high,whence,newOffset){abort("it should not be possible to operate on streams when !SYSCALLS_REQUIRE_FILESYSTEM")}function _fd_write(fd,iov,iovcnt,pnum){var num=0;for(var i=0;i<iovcnt;i++){var ptr=HEAP32[iov+i*8>>2];var len=HEAP32[iov+(i*8+4)>>2];for(var j=0;j<len;j++){SYSCALLS.printChar(fd,HEAPU8[ptr+j])}num+=len}HEAP32[pnum>>2]=num;return 0}var 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Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you")};if(!Object.getOwnPropertyDescriptor(Module,"UTF8ArrayToString"))Module["UTF8ArrayToString"]=function(){abort("'UTF8ArrayToString' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"UTF8ToString"))Module["UTF8ToString"]=function(){abort("'UTF8ToString' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"stringToUTF8Array"))Module["stringToUTF8Array"]=function(){abort("'stringToUTF8Array' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"stringToUTF8"))Module["stringToUTF8"]=function(){abort("'stringToUTF8' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"lengthBytesUTF8"))Module["lengthBytesUTF8"]=function(){abort("'lengthBytesUTF8' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"stackTrace"))Module["stackTrace"]=function(){abort("'stackTrace' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"addOnPreRun"))Module["addOnPreRun"]=function(){abort("'addOnPreRun' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"addOnInit"))Module["addOnInit"]=function(){abort("'addOnInit' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"addOnPreMain"))Module["addOnPreMain"]=function(){abort("'addOnPreMain' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"addOnExit"))Module["addOnExit"]=function(){abort("'addOnExit' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"addOnPostRun"))Module["addOnPostRun"]=function(){abort("'addOnPostRun' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"writeStringToMemory"))Module["writeStringToMemory"]=function(){abort("'writeStringToMemory' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"writeArrayToMemory"))Module["writeArrayToMemory"]=function(){abort("'writeArrayToMemory' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"writeAsciiToMemory"))Module["writeAsciiToMemory"]=function(){abort("'writeAsciiToMemory' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"addRunDependency"))Module["addRunDependency"]=function(){abort("'addRunDependency' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you")};if(!Object.getOwnPropertyDescriptor(Module,"removeRunDependency"))Module["removeRunDependency"]=function(){abort("'removeRunDependency' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you")};if(!Object.getOwnPropertyDescriptor(Module,"FS_createFolder"))Module["FS_createFolder"]=function(){abort("'FS_createFolder' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you")};if(!Object.getOwnPropertyDescriptor(Module,"FS_createPath"))Module["FS_createPath"]=function(){abort("'FS_createPath' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you")};if(!Object.getOwnPropertyDescriptor(Module,"FS_createDataFile"))Module["FS_createDataFile"]=function(){abort("'FS_createDataFile' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you")};if(!Object.getOwnPropertyDescriptor(Module,"FS_createPreloadedFile"))Module["FS_createPreloadedFile"]=function(){abort("'FS_createPreloadedFile' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you")};if(!Object.getOwnPropertyDescriptor(Module,"FS_createLazyFile"))Module["FS_createLazyFile"]=function(){abort("'FS_createLazyFile' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you")};if(!Object.getOwnPropertyDescriptor(Module,"FS_createLink"))Module["FS_createLink"]=function(){abort("'FS_createLink' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you")};if(!Object.getOwnPropertyDescriptor(Module,"FS_createDevice"))Module["FS_createDevice"]=function(){abort("'FS_createDevice' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you")};if(!Object.getOwnPropertyDescriptor(Module,"FS_unlink"))Module["FS_unlink"]=function(){abort("'FS_unlink' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you")};if(!Object.getOwnPropertyDescriptor(Module,"dynamicAlloc"))Module["dynamicAlloc"]=function(){abort("'dynamicAlloc' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"loadDynamicLibrary"))Module["loadDynamicLibrary"]=function(){abort("'loadDynamicLibrary' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"loadWebAssemblyModule"))Module["loadWebAssemblyModule"]=function(){abort("'loadWebAssemblyModule' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)")};if(!Object.getOwnPropertyDescriptor(Module,"getLEB"))Module["getLEB"]=function(){abort("'getLEB' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the 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Promise(function(resolve,reject){resolve(getBinary())})}function createWasm(){var info={"a":asmLibraryArg};function receiveInstance(instance,module){var exports=instance.exports;Module["asm"]=exports;removeRunDependency("wasm-instantiate")}addRunDependency("wasm-instantiate");function receiveInstantiatedSource(output){receiveInstance(output["instance"])}function instantiateArrayBuffer(receiver){return getBinaryPromise().then(function(binary){return WebAssembly.instantiate(binary,info)}).then(receiver,function(reason){err("failed to asynchronously prepare wasm: "+reason);abort(reason)})}function instantiateAsync(){if(!wasmBinary&&typeof WebAssembly.instantiateStreaming==="function"&&!isDataURI(wasmBinaryFile)&&typeof fetch==="function"){fetch(wasmBinaryFile,{credentials:"same-origin"}).then(function(response){var result=WebAssembly.instantiateStreaming(response,info);return result.then(receiveInstantiatedSource,function(reason){err("wasm streaming compile failed: "+reason);err("falling back to ArrayBuffer instantiation");instantiateArrayBuffer(receiveInstantiatedSource)})})}else{return instantiateArrayBuffer(receiveInstantiatedSource)}}if(Module["instantiateWasm"]){try{var exports=Module["instantiateWasm"](info,receiveInstance);return exports}catch(e){err("Module.instantiateWasm callback failed with error: "+e);return false}}instantiateAsync();return{}}__ATINIT__.push({func:function(){___wasm_call_ctors()}});function ___assert_fail(condition,filename,line,func){abort("Assertion failed: "+UTF8ToString(condition)+", at: "+[filename?UTF8ToString(filename):"unknown filename",line,func?UTF8ToString(func):"unknown function"])}function _emscripten_get_heap_size(){return HEAPU8.length}function _emscripten_memcpy_big(dest,src,num){HEAPU8.copyWithin(dest,src,src+num)}function emscripten_realloc_buffer(size){try{wasmMemory.grow(size-buffer.byteLength+65535>>16);updateGlobalBufferAndViews(wasmMemory.buffer);return 1}catch(e){}}function _emscripten_resize_heap(requestedSize){var oldSize=_emscripten_get_heap_size();var PAGE_MULTIPLE=65536;var maxHeapSize=2147483648-PAGE_MULTIPLE;if(requestedSize>maxHeapSize){return false}var minHeapSize=16777216;for(var cutDown=1;cutDown<=4;cutDown*=2){var overGrownHeapSize=oldSize*(1+.2/cutDown);overGrownHeapSize=Math.min(overGrownHeapSize,requestedSize+100663296);var newSize=Math.min(maxHeapSize,alignUp(Math.max(minHeapSize,requestedSize,overGrownHeapSize),PAGE_MULTIPLE));var replacement=emscripten_realloc_buffer(newSize);if(replacement){return true}}return false}var PATH={splitPath:function(filename){var splitPathRe=/^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;return splitPathRe.exec(filename).slice(1)},normalizeArray:function(parts,allowAboveRoot){var up=0;for(var i=parts.length-1;i>=0;i--){var last=parts[i];if(last==="."){parts.splice(i,1)}else if(last===".."){parts.splice(i,1);up++}else if(up){parts.splice(i,1);up--}}if(allowAboveRoot){for(;up;up--){parts.unshift("..")}}return parts},normalize:function(path){var isAbsolute=path.charAt(0)==="/",trailingSlash=path.substr(-1)==="/";path=PATH.normalizeArray(path.split("/").filter(function(p){return!!p}),!isAbsolute).join("/");if(!path&&!isAbsolute){path="."}if(path&&trailingSlash){path+="/"}return(isAbsolute?"/":"")+path},dirname:function(path){var result=PATH.splitPath(path),root=result[0],dir=result[1];if(!root&&!dir){return"."}if(dir){dir=dir.substr(0,dir.length-1)}return root+dir},basename:function(path){if(path==="/")return"/";var lastSlash=path.lastIndexOf("/");if(lastSlash===-1)return path;return path.substr(lastSlash+1)},extname:function(path){return PATH.splitPath(path)[3]},join:function(){var paths=Array.prototype.slice.call(arguments,0);return PATH.normalize(paths.join("/"))},join2:function(l,r){return PATH.normalize(l+"/"+r)}};var SYSCALLS={mappings:{},buffers:[null,[],[]],printChar:function(stream,curr){var buffer=SYSCALLS.buffers[stream];if(curr===0||curr===10){(stream===1?out:err)(UTF8ArrayToString(buffer,0));buffer.length=0}else{buffer.push(curr)}},varargs:undefined,get:function(){SYSCALLS.varargs+=4;var ret=HEAP32[SYSCALLS.varargs-4>>2];return ret},getStr:function(ptr){var ret=UTF8ToString(ptr);return ret},get64:function(low,high){return low}};function _fd_close(fd){return 0}function _fd_seek(fd,offset_low,offset_high,whence,newOffset){}function _fd_write(fd,iov,iovcnt,pnum){var num=0;for(var i=0;i<iovcnt;i++){var ptr=HEAP32[iov+i*8>>2];var len=HEAP32[iov+(i*8+4)>>2];for(var j=0;j<len;j++){SYSCALLS.printChar(fd,HEAPU8[ptr+j])}num+=len}HEAP32[pnum>>2]=num;return 0}var asmLibraryArg={"a":___assert_fail,"d":_emscripten_memcpy_big,"e":_emscripten_resize_heap,"f":_fd_close,"c":_fd_seek,"b":_fd_write,"memory":wasmMemory,"table":wasmTable};var asm=createWasm();Module["asm"]=asm;var ___wasm_call_ctors=Module["___wasm_call_ctors"]=function(){return(___wasm_call_ctors=Module["___wasm_call_ctors"]=Module["asm"]["g"]).apply(null,arguments)};var _create_buffer=Module["_create_buffer"]=function(){return(_create_buffer=Module["_create_buffer"]=Module["asm"]["h"]).apply(null,arguments)};var _destroy_buffer=Module["_destroy_buffer"]=function(){return(_destroy_buffer=Module["_destroy_buffer"]=Module["asm"]["i"]).apply(null,arguments)};var _get_image_bytes_from_handle=Module["_get_image_bytes_from_handle"]=function(){return(_get_image_bytes_from_handle=Module["_get_image_bytes_from_handle"]=Module["asm"]["j"]).apply(null,arguments)};var _get_num_bytes_from_handle=Module["_get_num_bytes_from_handle"]=function(){return(_get_num_bytes_from_handle=Module["_get_num_bytes_from_handle"]=Module["asm"]["k"]).apply(null,arguments)};var _release_image_handle=Module["_release_image_handle"]=function(){return(_release_image_handle=Module["_release_image_handle"]=Module["asm"]["l"]).apply(null,arguments)};var _get_png_handle_from_webp=Module["_get_png_handle_from_webp"]=function(){return(_get_png_handle_from_webp=Module["_get_png_handle_from_webp"]=Module["asm"]["m"]).apply(null,arguments)};var _get_jpg_handle_from_webp=Module["_get_jpg_handle_from_webp"]=function(){return(_get_jpg_handle_from_webp=Module["_get_jpg_handle_from_webp"]=Module["asm"]["n"]).apply(null,arguments)};var stackSave=Module["stackSave"]=function(){return(stackSave=Module["stackSave"]=Module["asm"]["o"]).apply(null,arguments)};var stackAlloc=Module["stackAlloc"]=function(){return(stackAlloc=Module["stackAlloc"]=Module["asm"]["p"]).apply(null,arguments)};var stackRestore=Module["stackRestore"]=function(){return(stackRestore=Module["stackRestore"]=Module["asm"]["q"]).apply(null,arguments)};var dynCall_vi=Module["dynCall_vi"]=function(){return(dynCall_vi=Module["dynCall_vi"]=Module["asm"]["r"]).apply(null,arguments)};Module["asm"]=asm;Module["cwrap"]=cwrap;var calledRun;function ExitStatus(status){this.name="ExitStatus";this.message="Program terminated with exit("+status+")";this.status=status}dependenciesFulfilled=function runCaller(){if(!calledRun)run();if(!calledRun)dependenciesFulfilled=runCaller};function run(args){args=args||arguments_;if(runDependencies>0){return}preRun();if(runDependencies>0)return;function doRun(){if(calledRun)return;calledRun=true;Module["calledRun"]=true;if(ABORT)return;initRuntime();preMain();if(Module["onRuntimeInitialized"])Module["onRuntimeInitialized"]();postRun()}if(Module["setStatus"]){Module["setStatus"]("Running...");setTimeout(function(){setTimeout(function(){Module["setStatus"]("")},1);doRun()},1)}else{doRun()}}Module["run"]=run;if(Module["preInit"]){if(typeof Module["preInit"]=="function")Module["preInit"]=[Module["preInit"]];while(Module["preInit"].length>0){Module["preInit"].pop()()}}noExitRuntime=true;run();
diff --git a/image/webp-shim/webp-shim-module.wasm b/image/webp-shim/webp-shim-module.wasm
index 62e9e29..df5f1b6 100644
Binary files a/image/webp-shim/webp-shim-module.wasm and b/image/webp-shim/webp-shim-module.wasm differ
diff --git a/image/webp-shim/webp-shim.js b/image/webp-shim/webp-shim.js
index 2cdc16f..ad72133 100644
--- a/image/webp-shim/webp-shim.js
+++ b/image/webp-shim/webp-shim.js
@@ -20,8 +20,8 @@ function loadWebPShimApi() {
   return loadingPromise = new Promise((resolve, reject) => {
     const scriptEl = document.createElement('script');
     scriptEl.onload = () => {
-      Module.print = str => console.log(str);
-      Module.printErr = str => console.error(str);
+      Module.print = str => console.log(`${Date.now()}: ${str}`);
+      Module.printErr = str => console.error(`${Date.now()}: ${str}`);
       Module.onRuntimeInitialized = () => {
         api = {
           createWASMBuffer: Module.cwrap('create_buffer', 'number', ['number', 'number']),
@@ -76,13 +76,13 @@ export function convertWebPtoJPG(webpBuffer) {
     // Create a buffer of the WebP bytes that we can send into WASM-land.
     const size = webpBuffer.byteLength;
     const webpWASMBuffer = api.createWASMBuffer(size);
-    api.heap.set(webpBuffer, webpWASMBuffer);
+    api.module.HEAPU8.set(webpBuffer, webpWASMBuffer);
 
     // Convert to JPG.
     const jpgHandle = api.getJPGHandle(webpWASMBuffer, size);
     const numJPGBytes = api.getNumBytesFromHandle(jpgHandle);
     const jpgBufPtr = api.getImageBytesFromHandle(jpgHandle);
-    const jpgBuffer = api.heap.slice(jpgBufPtr, jpgBufPtr + numJPGBytes - 1);
+    const jpgBuffer = api.module.HEAPU8.slice(jpgBufPtr, jpgBufPtr + numJPGBytes - 1);
 
     // Cleanup.
     api.releaseImageHandle(jpgHandle);