Workletizable Classes

[tjzel]

Summary

This pull request features running classes on the Worklet runtime. Classes aren't supported by Hermes and require polyfilling.

• Class instances can be created in worklets.
• Class instances cannot be sent between runtimes - afaik it's impossible to create host objects with a prototype.
• Static class methods aren't supported - a feature for the future perhaps.

Current implementation is a bit naive.

1. We create worklets from all required polyfills.
2. We create the whole class (not the class instance!) in the worklet.
3. We create the instance of this ad-hoc made class.

We could could put the class in the global scope, however it doesn't seem exactly necessary at the moment.

You can obtain a worklet class explicitly by adding a ClassProperty __workletClass to it

// Explicit WorkletClass
class Clazz {
  __workletClass = true;
}

or implicitly by placing it in a file with a worklet directive.

'worklet';
// Implicit WorkletClass
class Clazz {}

Test plan

• Add unit tests
• Add runtime tests suite

[bartlomiejbloniarz]

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