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Load script as module #353

Description

@JasonBarnabe

mini_racer 0.18.1
libv8-node 23.6.1.0
Ruby 3.4.2

JavaScript modules are different than classic scripts in a few ways. As an example, in a module, you can do a top-level await, but in a classic script, you can't.

> require 'mini_racer'
=> false
> context = MiniRacer::Context.new(timeout: 500, max_memory: 20_000_000)
=> #<MiniRacer::Context:0x00007f11ecd95148>
> context.eval('await Promise.resolve(console.log("🎉"));')
:3:in 'MiniRacer::Context#eval': Uncaught SyntaxError: await is only valid in async functions and the top level bodies of modules at <eval>:1:0 (MiniRacer::ParseError)
        from :3:in '<main>'

I would like to be able to load code as a module with mini_racer.

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