Preact uses the browser's native addEventListener for event handling.Synthetic Events: Preact's browser support target does not require this extra overhead.React.Children is fully supported in preact-compat.Children: Not necessary in Preact, because props.children is always an Array.PropTypes are fully supported in preact-compat, or you can use them manually.PropType Validation: Not everyone uses PropTypes, so they aren't part of Preact's core.Component and element recycling/pooling.className is still supported, but class is preferred. You can just use class for CSS classes.Batching of DOM updates, debounced/collated using setTimeout(1) (can also use requestAnimationFrame).This is just cleaner, particularly when destructuring You can still reference them manually.this.props and this.state are passed to render() for you.Preact actually adds a few convenient features inspired by work in the React community: It's also a little more readable: h('a',, h('span', null, 'Home')).This idea was originally called hyperscript and has value well beyond the React ecosystem, so Preact promotes the original standard.h(), a more generalized version of React.createElement.This is a given - Preact's diff is simple but effective, and extremely fast.Refs provide a way to refer to rendered elements and child components.String refs are supported in preact-compat. Refs: Support for function refs was added in Preact in 4.0.Support for the new api is discussed as PR #963.Contexts: Support for the legacy context API was added in Preact 3.0.functions that receive props as arguments and return JSX/VDOM.components that return other components from render(), effectively wrappers.classes provide an expressive way to define stateful components.Thus, the website and documentation reflect React 0.14.x and 15.x when discussing compatibility or making comparisons. This is a fairly democratic process, constantly evolving through discussion and decisions made in the open, using issues and pull requests. When new features are announced by the React team, they may be added to Preact's core if it makes sense given the Project Goals. Also I can't quite believe that this wouldn't work out the box.For both Preact and preact-compat, version compatibility is measured against the current and previous major releases of React. So is this actually a gap in support that still exists? Or am I doing something wrong? Perhaps I somehow have an outdated lib def or have things configured wrong? I can't find anything googling for the error message, which leads me to suspect it's an issue with my setup. When I dig into the react.js lib def referenced in the error it does appear that the error is factually correct - the export of Fragment is defined and Fragment is not defined as a property on the default export.īut the flow docs state that flow has support for react Fragments from v0.59 onwards. What is going on here? I would like to use the Fragment shorthand syntax, and this issue is stopping me from doing that for now. With an explicit import of Fragment, however, flow does not complain. private/tmp/flow/flowlib_2349df3a/react.jsĢ55│ +initializeTouchEvents: typeof initializeTouchEvents,Ģ56│ +checkPropTypes: typeof checkPropTypes,Ģ58│ +createElement: typeof createElement,Ģ60│ +createFactory: typeof createFactory,Ģ61│ +isValidElement: typeof isValidElement,Ģ63│ +PureComponent: typeof PureComponent, Using react Fragments with either or the shorthand syntax like so import React from 'react'įlow complains with the following error (it's an indentical error for both, just showing output for ComponentA here) Cannot get React.Fragment because property Fragment is missing in object type. I am using react v16.3.0 and flow-bin v0.69.0
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