I would push for jsconfig.json if my team was unwilling or unable to use TypeScript (maybe mandated by high-ups). Because introducing tsc into the build would mean we would want to also introduce it in CI, and that would go against the mandate. If the team was able to adopt TypeScript, I would just do the conversion–probably incrementally. If the team was willing to look at less mainstream alt-JS options, I would push for ReasonML :-)
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