New Flow Language Features for React
We have thousands of engineers committing React code every day to Meta’s largest codebases. Part of our responsibility on the Flow team is to make it as easy as possible for anyone to contribute, from design system React experts to C++ engineers making one-off internal pages to support their backend services. Over the last year, we’ve built several new language features to make it easier than ever
Release v0.200.0 · facebook/flow
Likely to cause new Flow errors: We now require all generic functions to be fully annotated to prevent generic-escape issues. Some escaped-generic errors will be removed with missing-local-annot errors on return type annotation positions. Under LTI, we will no longer silently give unannotated parameters in destructuring assignment any type. Instead, they will be properly contextually typed. e.g. t
Release v0.197.0 · facebook/flow
Local Type Inference: We are releasing a new inference mode called local type inference. You can enable this new mode in your codebase by adding inference_mode=lti to the [options] section in the flowconfig. We will describe more details on this inference mode in an upcoming blog post. Likely to cause new Flow errors: Unannotated class properties initialized with null will now errors. We now requi
Migrating millions of lines of code to TypeScript
On Sunday March 6, we migrated Stripe’s largest JavaScript codebase (powering the Stripe Dashboard) from Flow to TypeScript. In a single pull request, we converted more than 3.7 million lines of code. The next day, hundreds of engineers came in to start writing TypeScript for their projects. Seriously unreal. I remember a short time ago laughing at the idea of typescript ever landing at Stripe, an
How We Migrated from Javascript and Flow to TypeScript at Osome
How We Migrated from Javascript and Flow to TypeScript at Osome This fairy tale started a long time ago. Often, you make a bet on the wrong horse in life, but, unfortunately, you cannot do anything about it. You're always working with limited information (especially about the future), when making decisions, so essentially you are betting. This is life: sometimes it happens in your personal life an
Andrew Lunny on Twitter: "Over the weekend, my team at @stripe converted the company's largest JS codebase from Flow to @typescript. We modif… https://t.co/041VgOss39"
Over the weekend, my team at @stripe converted the company's largest JS codebase from Flow to @typescript. We modif… https://t.co/041VgOss39
Release v0.153.0 · facebook/flow
Likely to cause new Flow errors: Enforce that interfaces are supertypes of objects and classes. Also prevent objects from being a supertype of a class. Improve soundness of this typing by banning the unbinding of class methods (see https://medium.com/flow-type/sound-typing-for-this-in-flow-d62db2af969e). New Features: You can require an exhaustive check of an enum in a switch statement that includ
react.christmas - react リソースおよび情報
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Release v0.115.0 · facebook/flow
Likely to cause new Flow errors: In Types First mode, exported classes and functions cannot be reassigned. Added similar checking of symbol in non-strict equality as other primitive types (example). We allow for non-strict equality checks between two symbol types, and between a symbol and null/void (example). We now write properties to unsealed objects recorded during speculative checking, after s
Phantom types with Flow
Adapted from “Phantom type” Haskell Wiki A phantom type is a parametrised type whose parameters do not all appear on the right-hand side of its definition, e.g class Data<M> { value: string; constructor(value: string) { this.value = value } }Here Data is a phantom type, because the M parameter doesn’t appear in its implementation. Why? An example: validating user inputSay you have a use(input: str
What the Flow team has been up to
Hello! (And sorry for the radio silence.)A lot of our open-source users are rightfully observing that the Flow team has effectively stopped paying attention to an ever-growing list of issues and PRs on GitHub. And while there has been a lot of activity in terms of GitHub commits during this time, there has been little to no communication about our roadmap. We understand that this state of affairs
Porting 30K lines of code from Flow to TypeScript
We recently ported MemSQL Studio's 30 thousand lines of JavaScript from using Flow to TypeScript. In this article, I describe why we ported our codebase, how it took place and how it has been working out for us. Disclaimer: my goal with this blog post is not to condemn Flow or usage of Flow. I highly admire the project, and I think that there is enough space in the JavaScript community for both ty
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Release v0.260.0 · facebook/flow
Requiring More Annotations to Functions and Classes in Flow
GitHub - Airtable/typescript-migration-codemod: The codemod Airtable used when migrating from Flow to TypeScript
Introducing Flow Enums
Sound Typing for “this” in Flow
GitHub - grubersjoe/reflow: Convert a Flow typed codebase to TypeScript (Babel plugin)
Release v0.111.0 · facebook/flow
Release v0.101.0 · facebook/flow