I'm currently working on optimizing my vendor bundle.js file, which has gotten quite large due to my use of the material-ui library.
import Card from 'material-ui'; // This is not ideal as it imports everything
Could someone please explain the difference between these two import statements in terms of the amount of JavaScript code they bring into your application? Are they the same size or different?
import { Card } from 'material-ui';
import Card from 'material-ui/Card'
Here, the two imports are equivalent.
The first import statement is:
import { Card } from 'material-ui';
This code snippet imports the exported member Card from the root of the material-ui library. When we check the source code, it reveals that it's structured like this:
export Card from './Card';
It essentially brings in the default export from ./Card (which resolves to material-ui/Card).
Now, let's consider the second import statement:
import Card from 'material-ui/Card'
This second import simply fetches the default export from material-ui/Card, mirroring the functionality of the first import.
Given this information, both imports achieve the same result.
import Component from 'material-ui';
This code snippet will bring in the default export from material-ui and assign it to a variable named Component.
import { Component } from 'material-ui';
By using this syntax, you are specifically importing a named export called Component (if it exists) from the material-ui library.
If you would like more detailed information on this topic, please visit the following stack overflow post:
When should I use curly braces for ES6 import?
One key distinction lies in the compiled code. To enhance performance, the optimal choice is as follows:
import Card from 'material-ui/Card'
This approach directly targets the requested module, making it the superior option.
Conversely, with the second alternative:
export Card from './Card'
Babel employs the transform-export-extension plugin for code compilation, resulting in larger compiled code compared to the first option.
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