Step by step guide on including a JavaScript function in a web worker using importScripts

Question

Step by step guide on including a JavaScript function in a web worker using importScripts

I am encountering an issue with my worker.js file:

self.importScripts('/static/utils/utils.js')

onmessage = (e) => {
    let a = e.data[0]
    let b = e.data[1]
    let c = func1(a,b)
    postMessage(c)
}

The structure of the utils.js file is as follows:

module.exports = {
func1: function(a,b){
    return a+b
}

An error message keeps popping up:

Uncaught ReferenceError: module is not defined
    at utils.js:1

Curiously, although server side imports like require and import are not functioning properly, I am puzzled by the fact that importScripts is causing issues - https://developer.mozilla.org/en-US/docs/Web/API/WorkerGlobalScope/importScripts

javascript web-worker

Answer 1

Answer №1

To optimize your workflow, consider integrating webpack with your worker. Alternatively, you can explore other options below.

In my experience, I often create a custom polyfill for node require:

// Please note that this code is not suitable for production environments
function require(moduleName) {
    self.module = { exports: null };
    
    if (moduleName == "fs")
        return null;
        
    if (!moduleName.endsWith(".js"))
        moduleName += ".js";

    importScripts(moduleName);
    return self.module.exports;
}

This method leverages the synchronous nature of importScripts. However, it may still encounter issues when attempting to load native node modules like fs, or if other module properties are utilized.

Answer 2

To optimize your workflow, consider integrating webpack with your worker. Alternatively, you can explore other options below.

In my experience, I often create a custom polyfill for node require:

// Please note that this code is not suitable for production environments
function require(moduleName) {
    self.module = { exports: null };
    
    if (moduleName == "fs")
        return null;
        
    if (!moduleName.endsWith(".js"))
        moduleName += ".js";

    importScripts(moduleName);
    return self.module.exports;
}

This method leverages the synchronous nature of importScripts. However, it may still encounter issues when attempting to load native node modules like fs, or if other module properties are utilized.

Answer 3

Answer №2

Give this a shot helperFunctions.js:

(function () {
    self.sumFunction = function (num1, num2) {
        return num1 + num2
    }
}());

Answer 4

Give this a shot helperFunctions.js:

(function () {
    self.sumFunction = function (num1, num2) {
        return num1 + num2
    }
}());

Answer 5

Answer №3

Consider implementing the following steps:

//within script.js
self.addEventListener("message", (event) => {
    importScripts("utilities.js")
    helpers.print1()
    helpers.print2()
})


//within utilities.js
//defining a global variable to be accessed by script.js
var helpers = {
    print1() {
        console.log("Here is some content from a utility module.")
    },
    print2() {
        console.log("And here's another piece of content from the utility module.")
    }
}

Answer 6

Consider implementing the following steps:

//within script.js
self.addEventListener("message", (event) => {
    importScripts("utilities.js")
    helpers.print1()
    helpers.print2()
})


//within utilities.js
//defining a global variable to be accessed by script.js
var helpers = {
    print1() {
        console.log("Here is some content from a utility module.")
    },
    print2() {
        console.log("And here's another piece of content from the utility module.")
    }
}

Step by step guide on including a JavaScript function in a web worker using importScripts

Answer №1

Answer №2

Answer №3

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