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lib: speed up MessageEvent creation internally #52951

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merged 2 commits into from
Jun 16, 2024
Merged

lib: speed up MessageEvent creation internally #52951

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43aa76e
lib: speed up MessageEvent creation internally
KhafraDev May 12, 2024
29c44f3
fixup
KhafraDev May 13, 2024
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11 changes: 6 additions & 5 deletions lib/internal/worker/io.js
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Original file line number Diff line number Diff line change
Expand Up @@ -85,9 +85,10 @@ const messageTypes = {
LOAD_SCRIPT: 'loadScript',
};

let messageEvent;
function lazyMessageEvent() {
return messageEvent ??= require('internal/deps/undici/undici').MessageEvent;
let fastCreateMessageEvent;
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function lazyMessageEvent(type, init) {
fastCreateMessageEvent ??= require('internal/deps/undici/undici').createFastMessageEvent;
return fastCreateMessageEvent(type, init);
}

// We have to mess with the MessagePort prototype a bit, so that a) we can make
Expand Down Expand Up @@ -128,7 +129,7 @@ ObjectDefineProperty(
}
const ports = this[kCurrentlyReceivingPorts];
this[kCurrentlyReceivingPorts] = undefined;
return new (lazyMessageEvent())(type, { data, ports });
return lazyMessageEvent(type, { data, ports });
},
configurable: false,
writable: false,
Expand Down Expand Up @@ -321,7 +322,7 @@ function receiveMessageOnPort(port) {
}

function onMessageEvent(type, data) {
this.dispatchEvent(new (lazyMessageEvent())(type, { data }));
this.dispatchEvent(lazyMessageEvent(type, { data }));
}

function isBroadcastChannel(value) {
Expand Down