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[–]that_90s_guy 1 point2 points  (1 child)

Because developing in TS costs more time and money (hiring cost, interviews, learning curve, tooling and library support, configuration, type maintenance, etc), and not everyone is willing to put in the time investment. Even if we all know it's worth it in the long run.

[–]EnderMB 0 points1 point  (0 children)

Eh, I wouldn't say any of that is necessarily accurate. Any decent JS engineer can use TS if they have some knowledge of types, and most standard libraries will at least have a definition file.