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I doubt that JS (and PHP) hackers even know what DO-178 is. Failing to fulfill that means you won't get the software on an aircraft in the first place. :-)
@RememberMe The main issue is that JS is usually executed in some interpreter (e.g. a browser) on top of an OS like Linux. You'll never get any of them certified for critical things because already DO-178 level C software requires code coverage and manual explanation for lines not covered. This is not feasible for the millions LOC for the Linux kernel alone. Any update requires the whole thing again.
That leaves level D and E software, which is for systems where there is either no impact at all or just a minor inconvenience. So, harmless stuff like inflight entertainment, or ground service maintenance racks.
I don't know enough about JS to say whether it's even possible to make it hard realtime, but I'm assuming that as long as you remove its traditional web dependencies, it's possible.
(It would be absolutely pointless, but eh.)
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