facebook/flow v0.154.0

on GitHub

Likely to cause new Flow errors:

• Added type checking for this parameters of functions (see https://medium.com/flow-type/sound-typing-for-this-in-flow-d62db2af969e).

New Features:

• Added codemod to cleanup the use of soon to be deprecated existential type (e.g. *). It can be run via flow codemod replace-existentials --write ..
• Added IDE quickfix for optional chaining when accessing an object that is nullable.

Notable bug fixes:

• Fixed crash related to a missing method unbinding error case.
• Fixed crash from calling the flow binary with an unknown argument.

Library Definitions:

• Fix MediaSource readyState to match the spec, "opened" -> "open" (thanks @sompylasar).

Misc:

• Remove experimental.this_annot config option and permanently enable now that our core lib defs rely on this feature.
• Remove prevously defaulted on new_check config option for the new check mode that uses significantly less RAM for large projects.