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You can create a new thread via. `new Worker` but using a worker requires a separate file, and lots of serialisation code as you communicate via `postMessage`. TC39 module expressions helps but not a lot of movement recently. https://github.com/tc39/proposal-module-expressions?tab=read...

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There's some progress on that proposal, just happening elsewhere. https://github.com/tc39/proposal-esm-phase-imports defines machinery for importing a ModuleSource object which you can instantiate as a Worker, and once that's done module expressions would just be syntax which evaluates to a ModuleSource rather than needing a separate import.

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