Bundle the modules while maintaining global scope for all variables

Question

Bundle the modules while maintaining global scope for all variables

To simplify my code for a specific problem, let's consider the following setup: In module1.js, I have the following class:

export class MyClass { };

And in index.js, I import MyClass from module1.js and assign it to a variable:

import { MyClass } from './module1.js'

var X = MyClass();

My objective is to bundle index.js using rollup in a way that the resulting file will look like this:


class MyClass { };
var X = MyClass();

I want to place this resulting file in a script tag and be able to access all declared variables in the global space, for example, window.MyClass and window.X from other scripts.

Are there any rollup options or plugins available for achieving this?

javascript global-variables es6-modules rollup rollupjs

Answer 1

Answer №1

When configuring Rollup, you have the option to specify the output.format as iife:

This will create a self-executing function that can be used as a <script> tag. The term "iife" refers to "immediately-invoked Function Expression."

This approach will give you the desired outcome, with the caveat that iifes contain their variables within their own scope (which is intentional). As a result, your variables won't be in the global scope.

To address this, you can either eliminate the function invocation around your code (i.e. remove (function(){ at the beginning and })() at the end), or explicitly declare the variables you want to be global by assigning them to the window object:

window.X = MyClass();

The latter method may be cleaner, as it avoids editing the bundled output, makes your intentions clear, and allows you to choose which variables should be global.

Does this solution meet your needs?

Answer 2

When configuring Rollup, you have the option to specify the output.format as iife:

This will create a self-executing function that can be used as a <script> tag. The term "iife" refers to "immediately-invoked Function Expression."

This approach will give you the desired outcome, with the caveat that iifes contain their variables within their own scope (which is intentional). As a result, your variables won't be in the global scope.

To address this, you can either eliminate the function invocation around your code (i.e. remove (function(){ at the beginning and })() at the end), or explicitly declare the variables you want to be global by assigning them to the window object:

window.X = MyClass();

The latter method may be cleaner, as it avoids editing the bundled output, makes your intentions clear, and allows you to choose which variables should be global.

Does this solution meet your needs?

Answer 3

Answer №2

The window global object holds a reference to another object also named window. By utilizing the extend functionality, you can easily add your own code to this variable:

{
    file: 'dist/mylib.js',
    format: 'iife',
    name: 'window',
    extend: true,
    esModule: false
}

Answer 4

The window global object holds a reference to another object also named window. By utilizing the extend functionality, you can easily add your own code to this variable:

{
    file: 'dist/mylib.js',
    format: 'iife',
    name: 'window',
    extend: true,
    esModule: false
}

Bundle the modules while maintaining global scope for all variables

Answer №1

Answer №2

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