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example.js

document.body.innerHTML = `
	<pre id="history"></pre>
	<form>
	<input id="message" type="text">
	<button id="send">Send Message</button>
	</form>
	<p>Computing fibonacci without worker:</p>
	<input id="fib1" type="number">
	<pre id="output1"></pre>
	<p>Computing fibonacci with worker:</p>
	<input id="fib2" type="number">
	<pre id="output2"></pre>
`;

const history = document.getElementById("history");
const message = document.getElementById("message");
const send = document.getElementById("send");
const fib1 = document.getElementById("fib1");
const output1 = document.getElementById("output1");
const fib2 = document.getElementById("fib2");
const output2 = document.getElementById("output2");

/// CHAT with shared worker ///

const chatWorker = new SharedWorker(
	new URL("./chat-worker.js", import.meta.url),
	{
		name: "chat",
		type: "module"
	}
);

let historyTimeout;
const scheduleUpdateHistory = () => {
	clearTimeout(historyTimeout);
	historyTimeout = setTimeout(() => {
		chatWorker.port.postMessage({ type: "history" });
	}, 1000);
};
scheduleUpdateHistory();

const from = `User ${Math.floor(Math.random() * 10000)}`;

send.addEventListener("click", e => {
	chatWorker.port.postMessage({
		type: "message",
		content: message.value,
		from
	});
	message.value = "";
	message.focus();
	e.preventDefault();
});

chatWorker.port.onmessage = event => {
	const msg = event.data;
	switch (msg.type) {
		case "history":
			history.innerText = msg.history.join("\n");
			scheduleUpdateHistory();
			break;
	}
};

/// FIBONACCI without worker ///

fib1.addEventListener("change", async () => {
	try {
		const value = parseInt(fib1.value, 10);
		const { fibonacci } = await import("./fibonacci");
		const result = fibonacci(value);
		output1.innerText = `fib(${value}) = ${result}`;
	} catch (e) {
		output1.innerText = e.message;
	}
});

/// FIBONACCI with worker ///

const fibWorker = new Worker(new URL("./fib-worker.js", import.meta.url), {
	name: "fibonacci",
	type: "module"
	/* webpackEntryOptions: { filename: "workers/[name].js" } */
});

fib2.addEventListener("change", () => {
	try {
		const value = parseInt(fib2.value, 10);
		fibWorker.postMessage(`${value}`);
	} catch (e) {
		output2.innerText = e.message;
	}
});

fibWorker.onmessage = event => {
	output2.innerText = event.data;
};

fib-worker.js

onmessage = async event => {
	const { fibonacci } = await import("./fibonacci");
	const value = JSON.parse(event.data);
	postMessage(`fib(${value}) = ${fibonacci(value)}`);
};

fibonacci.js

export function fibonacci(n) {
	return n < 1 ? 0 : n <= 2 ? 1 : fibonacci(n - 1) + fibonacci(n - 2);
}

chat-worker.js

import { history, add } from "./chat-module";

onconnect = function (e) {
	for (const port of e.ports) {
		port.onmessage = event => {
			const msg = event.data;
			switch (msg.type) {
				case "message":
					add(msg.content, msg.from);
				// fallthrough
				case "history":
					port.postMessage({
						type: "history",
						history
					});
					break;
			}
		};
	}
};

chat-module.js

export const history = [];

export const add = (content, from) => {
	if (history.length > 10) history.shift();
	history.push(`${from}: ${content}`);
};

dist/main.js

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var __webpack_exports__ = {};
/*!********************!*\
  !*** ./example.js ***!
  \********************/
/*! unknown exports (runtime-defined) */
/*! runtime requirements: __webpack_require__.p, __webpack_require__.b, __webpack_require__.u, __webpack_require__.e, __webpack_require__, __webpack_require__.* */
/*! ModuleConcatenation bailout: Module is not an ECMAScript module */
document.body.innerHTML = `
	<pre id="history"></pre>
	<form>
	<input id="message" type="text">
	<button id="send">Send Message</button>
	</form>
	<p>Computing fibonacci without worker:</p>
	<input id="fib1" type="number">
	<pre id="output1"></pre>
	<p>Computing fibonacci with worker:</p>
	<input id="fib2" type="number">
	<pre id="output2"></pre>
`;

const history = document.getElementById("history");
const message = document.getElementById("message");
const send = document.getElementById("send");
const fib1 = document.getElementById("fib1");
const output1 = document.getElementById("output1");
const fib2 = document.getElementById("fib2");
const output2 = document.getElementById("output2");

/// CHAT with shared worker ///

const chatWorker = new SharedWorker(
	new URL(/* worker import */ __webpack_require__.p + __webpack_require__.u(348), __webpack_require__.b),
	{
		name: "chat",
		type: undefined
	}
);

let historyTimeout;
const scheduleUpdateHistory = () => {
	clearTimeout(historyTimeout);
	historyTimeout = setTimeout(() => {
		chatWorker.port.postMessage({ type: "history" });
	}, 1000);
};
scheduleUpdateHistory();

const from = `User ${Math.floor(Math.random() * 10000)}`;

send.addEventListener("click", e => {
	chatWorker.port.postMessage({
		type: "message",
		content: message.value,
		from
	});
	message.value = "";
	message.focus();
	e.preventDefault();
});

chatWorker.port.onmessage = event => {
	const msg = event.data;
	switch (msg.type) {
		case "history":
			history.innerText = msg.history.join("\n");
			scheduleUpdateHistory();
			break;
	}
};

/// FIBONACCI without worker ///

fib1.addEventListener("change", async () => {
	try {
		const value = parseInt(fib1.value, 10);
		const { fibonacci } = await __webpack_require__.e(/*! import() */ 129).then(__webpack_require__.bind(__webpack_require__, /*! ./fibonacci */ 2));
		const result = fibonacci(value);
		output1.innerText = `fib(${value}) = ${result}`;
	} catch (e) {
		output1.innerText = e.message;
	}
});

/// FIBONACCI with worker ///

const fibWorker = new Worker(new URL(/* worker import */ __webpack_require__.p + __webpack_require__.u(631), __webpack_require__.b), {
	name: "fibonacci",
	type: undefined
	/* webpackEntryOptions: { filename: "workers/[name].js" } */
});

fib2.addEventListener("change", () => {
	try {
		const value = parseInt(fib2.value, 10);
		fibWorker.postMessage(`${value}`);
	} catch (e) {
		output2.innerText = e.message;
	}
});

fibWorker.onmessage = event => {
	output2.innerText = event.data;
};

/******/ })()
;

dist/chat.js

/******/ (() => { // webpackBootstrap
/******/ 	"use strict";
var __webpack_exports__ = {};
/*!************************************!*\
  !*** ./chat-worker.js + 1 modules ***!
  \************************************/
/*! namespace exports */
/*! runtime requirements:  */

;// CONCATENATED MODULE: ./chat-module.js
const chat_module_history = [];

const add = (content, from) => {
	if (chat_module_history.length > 10) chat_module_history.shift();
	chat_module_history.push(`${from}: ${content}`);
};

;// CONCATENATED MODULE: ./chat-worker.js


onconnect = function (e) {
	for (const port of e.ports) {
		port.onmessage = event => {
			const msg = event.data;
			switch (msg.type) {
				case "message":
					add(msg.content, msg.from);
				// fallthrough
				case "history":
					port.postMessage({
						type: "history",
						history: chat_module_history
					});
					break;
			}
		};
	}
};

/******/ })()
;
(()=>{"use strict";const s=[];onconnect=function(t){for(const o of t.ports)o.onmessage=t=>{const e=t.data;switch(e.type){case"message":n=e.content,c=e.from,s.length>10&&s.shift(),s.push(`${c}: ${n}`);case"history":o.postMessage({type:"history",history:s})}var n,c}}})();

dist/workers/fibonacci.js

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var __webpack_exports__ = {};
/*!***********************!*\
  !*** ./fib-worker.js ***!
  \***********************/
/*! unknown exports (runtime-defined) */
/*! runtime requirements: __webpack_require__.e, __webpack_require__, __webpack_require__.* */
/*! ModuleConcatenation bailout: Module is not an ECMAScript module */
onmessage = async event => {
	const { fibonacci } = await __webpack_require__.e(/*! import() */ 129).then(__webpack_require__.bind(__webpack_require__, /*! ./fibonacci */ 2));
	const value = JSON.parse(event.data);
	postMessage(`fib(${value}) = ${fibonacci(value)}`);
};

/******/ })()
;
(()=>{var e={},r={};function o(t){var a=r[t];if(void 0!==a)return a.exports;var n=r[t]={exports:{}};return e[t](n,n.exports,o),n.exports}o.m=e,o.d=(e,r)=>{for(var t in r)o.o(r,t)&&!o.o(e,t)&&Object.defineProperty(e,t,{enumerable:!0,get:r[t]})},o.f={},o.e=e=>Promise.all(Object.keys(o.f).reduce(((r,t)=>(o.f[t](e,r),r)),[])),o.u=e=>e+".js",o.o=(e,r)=>Object.prototype.hasOwnProperty.call(e,r),o.r=e=>{"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},o.p="/dist/",(()=>{var e={631:1};o.f.i=(r,t)=>{e[r]||importScripts(o.p+o.u(r))};var r=self.webpackChunk=self.webpackChunk||[],t=r.push.bind(r);r.push=r=>{var[a,n,p]=r;for(var s in n)o.o(n,s)&&(o.m[s]=n[s]);for(p&&p(o);a.length;)e[a.pop()]=1;t(r)}})(),onmessage=async e=>{const{fibonacci:r}=await o.e(129).then(o.bind(o,129)),t=JSON.parse(e.data);postMessage(`fib(${t}) = ${r(t)}`)}})();

dist/129.js

(self["webpackChunk"] = self["webpackChunk"] || []).push([[129],{

/***/ 2:
/*!**********************!*\
  !*** ./fibonacci.js ***!
  \**********************/
/*! namespace exports */
/*! export fibonacci [provided] [maybe used in main, ./example.js|80:18-84:2 (runtime-defined)] [usage prevents renaming] */
/*! other exports [not provided] [maybe used in main, ./example.js|80:18-84:2 (runtime-defined)] */
/*! runtime requirements: __webpack_require__.r, __webpack_exports__, __webpack_require__.d, __webpack_require__.* */
/***/ ((__unused_webpack_module, __webpack_exports__, __webpack_require__) => {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */   "fibonacci": () => (/* binding */ fibonacci)
/* harmony export */ });
function fibonacci(n) {
	return n < 1 ? 0 : n <= 2 ? 1 : fibonacci(n - 1) + fibonacci(n - 2);
}


/***/ })

}]);

Info

Unoptimized

asset main.js 12.2 KiB [emitted] (name: main)
asset workers/fibonacci.js 5.43 KiB [emitted] (name: fibonacci)
asset 129.js 937 bytes [emitted]
asset chat.js 911 bytes [emitted] (name: chat)
chunk (runtime: ./example.js|80:18-84:2, main) 129.js 103 bytes [rendered]
  > ./fibonacci ./example.js 70:30-51
  > ./fibonacci ./fib-worker.js 2:29-50
  ./fibonacci.js 103 bytes [built] [code generated]
    [exports: fibonacci]
    import() ./fibonacci ./example.js 70:30-51
    import() ./fibonacci ./fib-worker.js 2:29-50
chunk (runtime: main) main.js (main) 2.25 KiB (javascript) 5.64 KiB (runtime) [entry] [rendered]
  > ./example.js main
  runtime modules 5.64 KiB 8 modules
  ./example.js 2.25 KiB [built] [code generated]
    [no exports used]
    entry ./example.js main
chunk (runtime: ./example.js|25:19-31:1) chat.js (chat) 527 bytes [entry] [rendered]
  > ./example.js 25:19-31:1
  ./chat-worker.js + 1 modules 527 bytes [built] [code generated]
    [no exports]
    [no exports used]
    new Worker() ./chat-worker.js ./example.js 25:19-31:1
chunk (runtime: ./example.js|80:18-84:2) workers/fibonacci.js (fibonacci) 176 bytes (javascript) 2.14 KiB (runtime) [entry] [rendered]
  > ./example.js 80:18-84:2
  runtime modules 2.14 KiB 7 modules
  ./fib-worker.js 176 bytes [built] [code generated]
    [no exports used]
    new Worker() ./fib-worker.js ./example.js 80:18-84:2
webpack 5.27.2 compiled successfully

Production mode

asset main.js 3.44 KiB [emitted] [minimized] (name: main)
asset workers/fibonacci.js 945 bytes [emitted] [minimized] (name: fibonacci)
asset chat.js 270 bytes [emitted] [minimized] (name: chat)
asset 129.js 166 bytes [emitted] [minimized]
chunk (runtime: ./example.js|80:18-84:2, main) 129.js 103 bytes [rendered]
  > ./fibonacci ./example.js 70:30-51
  > ./fibonacci ./fib-worker.js 2:29-50
  ./fibonacci.js 103 bytes [built] [code generated]
    [exports: fibonacci]
    import() ./fibonacci ./example.js 70:30-51
    import() ./fibonacci ./fib-worker.js 2:29-50
chunk (runtime: main) main.js (main) 2.25 KiB (javascript) 5.64 KiB (runtime) [entry] [rendered]
  > ./example.js main
  runtime modules 5.64 KiB 8 modules
  ./example.js 2.25 KiB [built] [code generated]
    [no exports used]
    entry ./example.js main
chunk (runtime: ./example.js|25:19-31:1) chat.js (chat) 527 bytes [entry] [rendered]
  > ./example.js 25:19-31:1
  ./chat-worker.js + 1 modules 527 bytes [built] [code generated]
    [no exports]
    [no exports used]
    new Worker() ./chat-worker.js ./example.js 25:19-31:1
chunk (runtime: ./example.js|80:18-84:2) workers/fibonacci.js (fibonacci) 176 bytes (javascript) 2.14 KiB (runtime) [entry] [rendered]
  > ./example.js 80:18-84:2
  runtime modules 2.14 KiB 7 modules
  ./fib-worker.js 176 bytes [built] [code generated]
    [no exports used]
    new Worker() ./fib-worker.js ./example.js 80:18-84:2
webpack 5.27.2 compiled successfully