facebook/flow v0.143.0

on GitHub

Likely to cause new Flow errors:

• Support for Classic mode has been dropped and Types-First mode is now always enabled (Types-First has been the default mode since v0.134). The types_first and well_formed_exports flowconfig options are no longer recognized. See https://medium.com/flow-type/types-first-a-scalable-new-architecture-for-flow-3d8c7ba1d4eb/ for more about Types-First mode.
• Previously, errors in library files were sometimes being missed due to a bug. This has been fixed, which may expose errors in library files that were not previously being reported.
• Import statements are no longer allowed at the toplevel of library files. To use import statements in library files they must appear within a "declare module".

New Features:

• Added experimental support for cross-module autocompletion and code actions that fix missing import declarations. Can be enabled with the autoimports=true flowconfig option.
• Added --sharedmem-heap-size CLI flag and FLOW_SHAREDMEM_HEAP_SIZE environment variable, which can be used instead of the sharedmem.heap_size flowconfig option for setting the amount of shared memory available.

Misc:

• Added ErrorEvent library definition (thanks @kegluneq)