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v0.19.0
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@gabelevi gabelevi released this 01 Dec 20:28
v0.19.0
698a53b

Likely to cause new Flow errors:

  • Flow syntax is now disallowed in non-@flow files. Use @noflow to work around this
  • import type * as Foo is now disallowed in favor of import type Foo
  • require() can only take a string literal
  • ES6 react classes without defaultProps should now extends React.Component<void, Props, State> (previously it was extends React.Component<{}, Props, State>)
  • ES6 react classes with defaultProps should declare static defaultProps: DefaultProps;
  • Flow notices errors it missed before in React.createClass() react components
  • Flow is now stricter about using uninitialized variables
  • Stricter checking of in keyword

New Features:

  • flow coverage command
  • null type annotation
  • Support for class field initializers, gated by .flowconfig options
  • You can now override flowlib definitions with local lib files
  • Basic support for computed properties
  • Declaration files (.flow files). Long story short, if foo.js and foo.js.flow exist, Flow will prefer the latter and ignore the former.
  • declare export - a way to declare the exported types in a non-lib file
  • Array rest destructuring assignment support

Notable Bug Fixes:

  • Fix "package not found" error in some symlink situations
  • Object indexer should not imply callable signature
  • Default param values can reference earlier params
  • Fixed a case where we weren't substituting type parameters properly
  • Fixed a situation where Flow would prefer an unchecked module over a library definition

Misc:

  • Add --root arg to most client commands
  • More repositioning of error locations
  • flow get-def: Jump to module named in import statement
  • Lots of fixes to make flow commands smarter about connecting to the server
  • Smarter refinement in a bunch of situations
  • freeze imports on all modules, and require() on ES6 modules
  • You can now spread classes, like var {x} = new Foo()
  • Interfaces now can be callable
  • If you've refined an object property, that refinement survives access through a destructured refinement
  • Better autocomplete results for primitives, objects, functions and unions
  • flow server will write to log file in addition to stdout/stderr
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