What is the reasoning behind npm modules such as material-ui exporting both es6 and es5 files?

Question

What is the reasoning behind npm modules such as material-ui exporting both es6 and es5 files?

When installing several npm modules, such as @material-ui/core, I noticed that there are three different ways to import the same React component:

import { AppBar } from '@material-ui/core'
import AppBar from '@material-ui/core/AppBar/AppBar'
import AppBar from '@material-ui/core/es/AppBar/AppBar'

Under what circumstances should the third variant / es6 exported files be used?
If webpack and the npm module support tree-shaking/dead code elimination. Is it better to use the first variant (named import) instead of the second one (default export)?

javascript material-ui

Answer 1

Answer №1

When it comes to exporting in JavaScript, there are two main types:

1) Named export allows you to explicitly export specific items like functions or constants:

// Exporting a previously declared function
export { myFunction }; 

// Exporting a constant
export const BAR = "bar";

To import these named exports, the syntax would look like this:

import {BAR, myFunction} from './file';

2) Default export is used for exporting a single item as the default:

export default function() {}

When importing a default export, you can rename it to whatever you like:

import newFunction from './file';

It's important to note that while you can have multiple named exports in a single file, you can only have one default export.

For more detailed information on JavaScript exports, you can visit: https://developer.mozilla.org/en-US/docs/web/javascript/reference/statements/export

Answer 2

When it comes to exporting in JavaScript, there are two main types:

1) Named export allows you to explicitly export specific items like functions or constants:

// Exporting a previously declared function
export { myFunction }; 

// Exporting a constant
export const BAR = "bar";

To import these named exports, the syntax would look like this:

import {BAR, myFunction} from './file';

2) Default export is used for exporting a single item as the default:

export default function() {}

When importing a default export, you can rename it to whatever you like:

import newFunction from './file';

It's important to note that while you can have multiple named exports in a single file, you can only have one default export.

For more detailed information on JavaScript exports, you can visit: https://developer.mozilla.org/en-US/docs/web/javascript/reference/statements/export

Answer 3

Answer №2

The primary distinction lies in how the library exports its modules.

When you use

import AppBar from '@material-ui/core/AppBar/AppBar'

, it indicates that @material-ui/core/AppBar/AppBar is exporting a single object with export default AppBar.

You are expected to import it as shown above. However, remember that you are not restricted to exporting only one default item from your module.

For instance, in React, the main object (i.e. React) is exported as default and contains all the properties you may need. But using ES6 import syntax, you can also specifically import a property or function from the module (e.g.

import { Component } from 'react';

, which is exported as export class Component...).

I trust this explanation is clear!

Answer 4

The primary distinction lies in how the library exports its modules.

When you use

import AppBar from '@material-ui/core/AppBar/AppBar'

, it indicates that @material-ui/core/AppBar/AppBar is exporting a single object with export default AppBar.

You are expected to import it as shown above. However, remember that you are not restricted to exporting only one default item from your module.

For instance, in React, the main object (i.e. React) is exported as default and contains all the properties you may need. But using ES6 import syntax, you can also specifically import a property or function from the module (e.g.

import { Component } from 'react';

, which is exported as export class Component...).

I trust this explanation is clear!

What is the reasoning behind npm modules such as material-ui exporting both es6 and es5 files?

Answer №1

Answer №2

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