What is "export default" in JavaScript?

ES6 is the first time that JavaScript has built-in modules. ES6 modules are stored in files.

The "export" statement is used to export functions, objects or primitives from a given module(or file).

There are two types of export available:

• Named export - useful to export several values from a given file.
• Default export - there can only be a single default export from a given file. 

If a module defines a default export, then you can import the default export by omitting the curly braces.

Read more:

http://exploringjs.com/es6/ch_modules.html

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/export

http://stackoverflow.com/questions/21117160/what-is-export-default-in-javascript