2024​

• February 6 - New type casting syntax for Flow: 'as'
• March 5 - Announcing User Defined Type Guards in Flow
• March 5 - Announcing Conditional Types
• April 3 - New Flow Language Features for React

2023​

• January 17 - Local Type Inference for Flow
• February 16 - Exact object types by default, by default
• March 15 - Announcing Partial & Required Flow utility types + catch annotations
• April 10 - Flow can now detect unused Promises
• August 17 - Announcing 5 new Flow tuple type features
• September 19 - Improved Flow Docs and Try Flow

2022​

• August 5 - New Flow Language Rule: Constrained Writes
• September 30 - Requiring More Annotations to Functions and Classes in Flow
• October 20 - Improved handling of the empty object in Flow

2021​

• May 25 - Clarity on Flow's Direction and Open Source Engagement
• June 2 - Sound Typing for 'this' in Flow
• July 21 - Introducing Flow Indexed Access Types
• September 13 - TypeScript Enums vs. Flow Enums
• September 13 - Introducing Flow Enums
• September 27 - Introducing: Local Type Inference for Flow

2020​

• January 29 - How to upgrade to exact-by-default object type syntax
• February 19 - Improvements to Flow in 2019
• March 9 - What we’re building in 2020
• March 16 - Making Flow error suppressions more specific
• May 18 - Types-First: A Scalable New Architecture for Flow
• November 16 - Flow's Improved Handling of Generic Types
• December 1 - Types-First the only supported mode in Flow (Jan 2021)

2019​

• January 28 - What the Flow Team Has Been Up To
• February 8 - A More Responsive Flow
• April 9 - Upgrading Flow Codebases
• August 20 - Coming Soon: Changes to Object Spreads
• October 25 - Live Flow errors in your IDE
• October 30 - Spreads: Common Errors & Fixes

2018​

• February 20 - Better Flow Error Messages for the JavaScript Ecosystem
• March 16 - New Flow Errors on Unknown Property Access in Conditionals
• October 18 - On the Roadmap: Exact Objects by Default
• October 29 - Asking for Required Annotations
• December 13 - Supporting React.forwardRef and Beyond

2017​

• May 7 - Strict Checking of Function Call Arity
• July 27 - Opaque Type Aliases
• August 4 - Linting in Flow
• August 16 - Even Better Support for React in Flow
• August 25 - Private Object Properties Using Flow’s Opaque Type Aliases
• September 3 - Typing Higher-Order Components in Recompose With Flow

2016​

• February 2 - Version 0.21.0
• July 1 - New Implementation of Unions and Intersections
• August 1 - Windows Support is Here!
• October 4 - Property Variance and Other Upcoming Changes
• October 13 - Introducing Flow-Typed

2015​

• February 18 - Announcing Typecasts
• February 18 - Announcing Import Type
• February 20 - Announcing Flow Comments
• March 12 - Announcing Bounded Polymorphism
• July 3 - Announcing Disjoint Unions
• July 29 - Version-0.14.0
• September 10 - Version-0.15.0
• September 22 - Version-0.16.0
• October 7 - Version-0.17.0
• November 9 - Typing Generators with Flow
• December 1 - Version-0.19.0