Experimental scope hoisting not removing dead code

[remko]

🐛 bug report

I tried the math example from the 1.9.0 blog post to see if tree shaking worked. It doesn't seem to do anything for me.

🎛 Configuration (.babelrc, package.json, cli command)

No babel configuration.

Ran parcel with ./node_modules/.bin/parcel build --experimental-scope-hoisting index.js

🤔 Expected Behavior

Generate code without the sub function.

😯 Current Behavior

The sub function is there

(function () {function a(r,$){return r+$}function b(r,$){return r-$}a,b;console.log(a(2,3));})();

💻 Code Sample

Straight from the blog post:

// index.js
import { add } from "./math";

console.log(add(2, 3));

// math.js
export function add(a, b) {
  return a+ b;
}

export function sub(a, b) {
  return a - b;
}

🌍 Your Environment

Software	Version(s)
Parcel	1.10.3
Node	11.1.0
npm/Yarn	1.12.1
Operating System	Mac OS X 10.14.1

[mischnic]

This seems to be a minimal example where treeshaking works correctly only with --no-minify actually (as in #2297):

(function() {
	// ASSET: math.js
	// math.js
	function $RK1r$export$add(a, b) {
		return a + b;
	}

	console.log($RK1r$export$add(2, 3));
})();