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EDIT: looks like it supports type annotations similar to closure compiler's (in docs) https://github.com/facebook/flow/blob/master/tests/docblock/docblock.js ht

by inglor 12y ago

EDIT: looks like it supports type annotations similar to closure compiler's (in docs) https://github.com/facebook/flow/blob/master/tests/docblock/docblock.js https://github.com/facebook/flow/blob/master/tests/docblock/... Try running an annotated file in the browser - it's simply not valid ECMAScript syntax and no JavaScript runtime will run it 'as is'. If the code requires transformation by a compiler aware of the language semantics and syntax - it's transpiling in my book. Just like TypeScript is a superset of ECMAScript - so is Flow (in a much lighter, closer to source sense it seems).

masklinn 12y ago
> Try running an annotated file in the browser - it's simply not valid ECMAScript syntax and no JavaScript runtime will run it 'as is'. Of course not, but the point was that it's not a different language, it simply adds type annotations. If you strip out the type annotations, it should be a valid JS file.
- inglor 12y ago
  This is also true for TypeScript though. The only thing that's not directly JS in TypeScript is shims for new JS features (from ES6) not yet implemented.
  - masklinn 12y ago
    > This is also true for TypeScript though. AFAIK none of these are valid javascript, event assuming ES6: * class-level variables (resolved as instance variables) * field visibility * initializer constructors (constructor without a body automatically assigning to a field) * enum types That is, you can't remove type annotations (and `interface` declarations which can probably get a pass) and end up with valid JS, which seems to be what flow yields.