added support for SharedArrayBuffers

[dioptre]

↪️ Pull Request

Adding required headers to use SharedArrayBuffers in parcel serve

💻 Examples

https://stackoverflow.com/questions/70535752/enable-sharedarraybuffer-on-localhost

🚨 Test instructions

const shared = new SharedArrayBuffer(1024);

[mischnic]

We already tried this before: #6404 and then reverted again in #6789 because many more people rely on some third party code/asset than on SAB: #6561

parcel-bundler/website#884

[lettertwo]

Maybe there's a path forward here along the lines of this comment from @Banou26 #6561 (comment)

One thing you could do if you want to make it a default behavior is detect the use of those features in the code and then apply the COOP/COEP headers just like Parcel already does with service workers or webworkers's usage of their register function serviceWorkerContainer.register.
If we use SharedArrayBuffer or performance., then apply the COOP/COEP headers, otherwise, don't.