Great work on the analysis, very thorough.
For what it's worth I disagree with
3) Default exports improve interoperability with legacy modules.
Based on my experience default exports do not help interoperability
with legacy module systems.
I'm currently working on a global namespaced script code to ES6/CJS
module compiler using node.js.
The compiler is written in ES6 and I'm using CJS npm packages in the project.
When an npm package exports a named identifier it's trivial to use it
in an ES6 module.
import {
parse,
print
} from 'recast';
When on the other hand it sets its export on `module.exports` default
exports provide no help at all.
There is no export named `default` to import, so I'm forced to use the
module form.
module minimist from 'minimist';
Examples taken from
https://github.com/briandipalma/global-compiler/blob/master/src/index.js
Default imports/exports seem totally unnecessary to me.
Nothing more then a distraction, providing no value but overhead.
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