execute a script using an npm module

Imagine having a function like this

index.js

greet = () => {
  console.log('hello');
}

greet();

and you want it to execute as soon as the page loads, so you include greet();. This works fine when the file is imported in your index.html

index.html

<! -- ... -->
<script src="./index.js"></script>

Now, you want to package this for others to use, so you publish it to npm and users can install it with

npm install greet-package

How will users run the greet() function after installing the package?

I'm exploring different options, besides exporting and importing the function, is there a way to make the script run automatically for users who have installed the package via npm?

Answer ā„–1

If you want to include lifecycle handler scripts in your package.json file, consider using the install or postinstall options. These are commonly used for scenarios like yours.

{
"scripts" :
  { "install" : "scripts/install.js"
  , "postinstall" : "scripts/install.js"
  }
}

For more information, visit https://docs.npmjs.com/misc/scripts

Answer ā„–2

My question now is how does the sayHi() function execute from the user's perspective?
I'm a bit unsure about how to phrase this, but essentially, once the user has npm installed the package, I want the script to automatically run.. is this doable?

When you publish your code as a package, as you mentioned, users typically import or require your package using something like require('say-hi'). At the point of require, the sayHi() function can be invoked right away from your code, and you'll see 'hi' displayed in the console.

By the way, remember that you don't necessarily have to export anything if you don't want to.

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Link a YAML file with interfaces in JavaScript

I'm currently learning JavaScript and need to convert a YAML file to an Interface in JavaScript. Here is an example of the YAML file: - provider_name: SEA-AD consortiumn_name: SEA-AD defaults: thumbnail Donors: - id: "https://portal.brain ...

Is it optimal to have nested promises for an asynchronous file read operation within a for loop in Node.js?

The following Node.js function requires: an object named shop containing a regular expression an array of filenames This function reads each csv file listed in the array, tests a cell in the first row with the provided regular expression, and returns a n ...

Troubleshooting: Issue with Vue component template iteration

What is causing the issue with iterating inside the component template in the code above? <!DOCTYPE html> <html> <head> <title>Exploring Vue components</title> <script src="https://cdn.jsdelivr.net/npm/vue"></s ...

The contact form fields shimmer as they transition in and out

I am currently working on a contact form that includes four input fields - name, phone, email, and message. The functionality I am looking to implement is that when I click on one input field, the other fields will fade by 30%, such as email, phone, and ...

The server mistakenly sent the resource as a Stylesheet even though it was interpreted differently

Dear Fellow Coders, Could anyone lend a hand? I encountered this issue on my website after uploading it to my FTP: "Resource interpreted as Stylesheet but transferred with MIME type text/plain" </head> <body> <div class= "navbar navbar ...

Storing JavaScript arrays in CSV format on the server

I am currently facing an issue while trying to save a multidimensional Javascript array as a CSV file on the server. Despite my efforts, the CSV file created does not seem to contain the actual array data, and I am unsure of what is causing this discrepanc ...

Is it possible to trigger a directive using a function and then access the generated style?

My directive is designed to randomly select a color and assign it to a new user as an avatar. The random color generation and directive functionality are working as expected, but I'm looking to expand the functionality further and need some assistance ...

Encountered a buildkite error stating that the plugins file is either missing or invalid, resulting in a failure to locate the module 'xlsx' when executing a cypress test. Strangely

Encountering an issue while running my Cypress test on Buildkite. Here's the error message: Status: Downloaded newer image for cypress/included:6.1.0 [2022-01-31T10:32:13Z] Your pluginsFile is set to /e2e/cypress/plugins/index.js, but either the fil ...

What is the process for determining the default character length in a <p> tag based on its height and width?

I'm trying to determine the default length for the <p> tag in HTML. It should be displayed based on the height and width of the <p> tag. For example: Consider the following code snippet, <p style="height:300px;width:200px;"> </ ...

Passing all emitted events from Vue 3 child component to its parent - A complete guide

My Vue components are structured as follows: <TopParent> <!-- Listening for events from EventProducer here --> <Child_1> <Child_2> <Child_3> ... <Child_N> <EventProducer /> &l ...

Developing a custom directive that utilizes a dynamic ng-options configuration

Alright, let me share with you my personalized directive: angular.module('bulwarkWebControls', []) .directive('customDropdown', [ function() { return { scope: { label: '@', // can be om ...

Passing props from parent component to map function in ReactJS results in undefined props

In my project, I dynamically create <textarea> elements using the map() function. Each textarea should have a unique value when the component is rendered. // Within the render method of ComponentA fruits.map((fruit) => { return <textarea na ...

Error encountered when attempting to use _id from a different collection due to a duplicate key

In my database, I currently have 2 collections set up. The first one is a 'Users' collection (which is functioning properly), and the other is a 'Rooms' collection (both designed for a chat application). I am looking to ensure that e ...

Obtain the content window using angularJS

I've been attempting to retrieve the content window of an iframe element. My approach in JQuery has been as follows: $('#loginframe')[0].contentWindow However, since I can't use JQuery in Angular, I've been trying to achieve thi ...

Leveraging information beyond the socket.on function

I'm trying to work with socket data in a way that allows me to compare it outside of the initial socket.on function. I've attempted using global variables without success. One thought I had was grouping the data, but one is an io.emit and the oth ...

Issues arise in mobile Safari when attempting to load JavaScript files, resulting in

Encountering an issue with my Angular app on mobile Safari during the initial load, where it hangs on a blank page for nearly 2 minutes. Interestingly, the app functions perfectly on other browsers, including Mac Safari and iPad Safari. Initially, I suspe ...

What could be causing Jquery's $.ajax to trigger all status codes even when the call is successful?

Here is a simple Jquery ajax function call I have. function fetchData(){ var jqxhr = $.ajax({ url: "../assets/js/data/users.json", type: "GET", cache: true, dataType: "json", statusC ...

Having trouble adding the Vonage Client SDK to my preact (vite) project

I am currently working on a Preact project with Vite, but I encountered an issue when trying to use the nexmo-client SDK from Vonage. Importing it using the ES method caused my project to break. // app.tsx import NexmoClient from 'nexmo-client'; ...

The WebSocket function is returning undefined even though it successfully fetches the user; however, the user is

I've been experimenting with a websocket to retrieve user information. When I establish the connection and send messages to receive the data, it returns undefined when I try to use that information elsewhere. However, if I run console.log within the ...

NodeJs took an unexpected turn

Iā€™m encountering an issue with an http request to forecast.io. When I make a normal request using $.ajax, everything works fine. However, when I try using the ajax-request module, I receive the following output: SyntaxError: Unexpected token u in JSON at ...