Private Object Properties Using Flow’s Opaque Type Aliases
In the last few weeks, a proposal for private class fields in Javascript reached stage 3. This is going to be a great way to hide implementation details away from users of your classes. However, locking yourself in to an OOP style of programming is not always ideal if you prefer a more functional style. Let’s talk about how you can use Flow’s opaque type aliases to get private properties on any ob
Even Better Support for React in Flow
The first version of Flow support for React was a magical implementation of React.createClass(). Since then, React has evolved significantly. It is time to rethink how Flow models React. In Flow 0.53.0 we are changing how Flow models React and in doing this we can provide better types for higher-order components, strict typing for React children, and fixes for a host of bugs in Flow’s React suppor
Higher-order Components | Flow
A popular pattern in React is the higher-order component pattern, so it's important that we can provide effective types for higher-order components in Flow. If you don't already know what a higher-order component is then make sure to read the React documentation on higher-order components before continuing. You can make use of the React.AbstractComponent type to annotate your higher order componen
Event Handling | Flow
The React docs for handling events show how an event handler can be attached to a React element. To type these event handlers you may use the SyntheticEvent<T> types like this: 1import {useState} from 'react';2import * as React from 'react';3 4function MyComponent(): React.Node {5 const [state, setState] = useState({count: 0});6 7 const handleClick = (event: SyntheticEvent<HTMLButtonElement>) => {
Components | Flow
Adding Flow types to your React components is incredibly powerful. After typing your component, Flow will statically ensure that you are using the component in the way it was designed to be used. Functional ComponentsAdding Flow types to a functional component is the same as adding types to a standard function. Just create an object type for the props and Flow will ensure that the props passed to
Type Reference | Flow
React exports a handful of utility types that may be useful to you when typing advanced React patterns. In previous sections we have seen a few of them. The following is a complete reference for each of these types along with some examples for how/where to use them. These types are all exported as named type exports from the react module. If you want to access them as members on the React object (
Release v0.53.0 · facebook/flow
This release includes major changes to Flow's model for React. The following links contain detailed documentation on the new model. Defining components Event handling ref functions Typing children Higher-order components Utility type reference Please use the new flow-upgrade tool to upgrade your codebase to take advantage of these changes! Likely to cause new Flow errors: We are modifying how you
Linting in Flow
In the past, Flow has had to make some tough decisions about what counts as a type error, and what we should surface in our analysis. Some things, like enforcing function call parameter counts, made the cut. Others, like erring when importing types from an untyped file, didn’t. With version 0.52 we’re rolling out the new Flow linter, creating a framework that lets us report things we find that are
Why We Chose Typescript - Upvoted
Niranjan Ramadas (u/nr4madas) Engineering Manager Earlier this year, our CEO, Steve, mentioned we are redesigning the site. Great! But how? Frontend engineering is in a very different state than it was when Reddit was first conceived. We have a large depth of options for just about every layer of web app development. From how to render views, style content, serve assets, and write code, frontend d
Release v0.49.0 · facebook/flow
Notable bug fixes: Optimized performance when typechecking classes Optimized performance of sentinel property checks involving large enums Lots of libdef updates! Thanks everyone for the contributions! Misc: Fixed infinite recursion from array spread Added experimental support for sending errors to an IDE over a persistent connection Removed unused --libs flag on status, check, and start commands
Release v0.48.0 · facebook/flow
New Features: Experimental support for "lazy" typechecking. On large codebases, the Flow server will start up faster when using the --lazy flag with flow start or flow server, by only computing dependency information and not doing any typechecking. Instead, as files are touched, they are typechecked incrementally along with files that depend on them (and their dependencies). Relatedly, running flo
Adopting Flow & TypeScript
A comparison between the two on-boarding processes. “Adopting Flow & TypeScript” is published by Jamie Kyle.
Release v0.47.0 · facebook/flow
Likely to cause new Flow errors: We are now sealing the object type that is passed to a React component's props. This means Flow will start complaining if you try and access unknown React props. Strict function call arity checking is now on for everyone! The experimental.strict_call_arity option has been removed. For more, see https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/ Notable bu
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Flow 0.53 prop types · Issue #1376 · jsx-eslint/eslint-plugin-react
Remove Flow support in React preset by ramasilveyra · Pull Request #6118 · babel/babel
babel-preset-react includes Flow, which conflicts with babel-preset-typescript. · Issue #6095 · babel/babel
Update React libdefs for Fiber · facebook/flow@770a206
React$Element<any> or React.Element<*> · Issue #4130 · facebook/flow
Add $Values type · facebook/flow@ab0789a
Import type dont recognize the type and returns any · Issue #23 · flow/flow-for-vscode