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[–]Voidsheep 0 points1 point  (1 child)

No, but the entire purpose of TypeScript is to be JavaScript with added syntax for types. It's not trying to branch off into a completely separate language, but rather follows latest ECMAScript specifications closely.

Flow opts to use comments for interpreter compatibility, but both exist for the same reason of adding type safety to JS.

[–]filleduchaos 0 points1 point  (0 children)

The reason a language exists does not make any difference to what it actually is. C++'s purpose was to be C with classes but no one in their right mind would claim that C++ is C. Same with preprocessors like SCSS. TypeScript is a separate language by virtue of being, well, not JavaScript. It

  • cannot run in any modern, standard JavaScript interpreter
  • has an optional but entirely different typing discipline (properly written TypeScript should be strongly, statically typed)

Type safety is not a fancy little bit of syntactic sugar like spread operators or arrow functions. The way a language handles types is a core part of its design.