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There is no generic “JavaScript runtime” interface that runtimes would implement, therefore support must be tailored to the specific interfaces of existing runtimes.
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At one point we had UMD[0], which effectively provided runtime-agnostic interface, but ES modules were incompatible with that.

Deno and Bun have decent Node compatibility, so couldn't Node APIs be used as the generic runtime interface?

[0]: https://github.com/umdjs/umd

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   --js-runtimes [deno|node|bun|quickjs]
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There is another by Meta for react native. Forgot the name.
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hermes
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