Export statement in Javascript

The export statement is used when creating JavaScript modules to export live bindings to functions, objects, or primitive values from the module so they can be used by other programs with the import statement. Bindings that are exported can still be modified locally; when imported, although they can only be read by the importing module the value updates whenever it is updated by the exporting module.

Exported modules are in strict mode whether you declare them as such or not. The export statement cannot be used in embedded scripts.

There are two types of exports:

Named Exports (Zero or more exports per module)

Default Exports (One per module)

// Exporting individual features

export let name1, name2, …, nameN; // also var, const

export let name1 = …, name2 = …, …, nameN; // also var, const

export function functionName(){...}

export class ClassName {...}

// Export list

export { name1, name2, …, nameN };

// Renaming exports

export { variable1 as name1, variable2 as name2, …, nameN };

// Exporting destructured assignments with renaming

export const { name1, name2: bar } = o;

// Default exports

export default expression;

export default function (…) { … } // also class, function*

export default function name1(…) { … } // also class, function*

export { name1 as default, … };

// Aggregating modules

export * from …; // does not set the default export

export * as name1 from …; // Draft ECMAScript® 2O21

export { name1, name2, …, nameN } from …;

export { import1 as name1, import2 as name2, …, nameN } from …;

export { default } from …;

for e.g. below code in Utils.js exports two functions 

export function setAuthTokenFromQueryString() {

    const urlParams = new URLSearchParams(window.location.search)

    const authToken = urlParams.get('token')

    console.log('authToken coming in to the app ',authToken)

    if(authToken){

        window.authToken = authToken

    }

}

export function getAuthToken(){

  return window.authToken

}

Below is how these two can be imported to use them 

import {getAuthToken, setAuthTokenFromQueryString} from '../../Utils/Utils'

references:

https://developer.mozilla.org/en-US/docs/web/javascript/reference/statements/export