Generated script tags don’t have defer

[surma]

🐛 bug report

I have 2 entry points, index.html and profile.html, each of loading their own specific piece of JavaScript, index.js and profile.js. Both these JS files depend on a common dependency utils.js. If utils.js is big enough to become its own chunk, the resulting HTML contains an additional <script> tag for the common dependencies.

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

Please see repro repo

🤔 Expected Behavior

The <script> tag for the common dependency should have defer if the original <script> tag has a defer attribute. Same for async.

😯 Current Behavior

The <script> tag for the common dependency does not have any attributes and is therefore renderblocking.

💁 Possible Solution

🔦 Context

Normal web development.

💻 Code Sample

Please see repro repo

🌍 Your Environment

Software	Version(s)
Parcel	2.0.0-alpha.3.2
Node	v12.8.0
npm/Yarn	6.12.1
Operating System	MacOS 10.15.3 (19D76)

[surma]

(The part where the generated <script> tag is in the wrong position in the markup I filed under #4303)

[mischnic]

Is the order of execution between two deferred/async script tags defined?

[surma]

Yes. They execute in parse-order.