jsx* and pragma* options are replaced by Fragment, jsx, jsxs, and jsxDEV.providerImportSource is replaced by useMDXComponents.Most options are the same as compile, with the following exceptions: ☢️ Danger: you likely must set development: boolean. They can be compiled to dynamic import() by passing eDynamicImport. Typically, import (or export … from) do not work here. But if you trust your content, evaluate can work. When possible, please use compile, write to a file, and then run with Node, or use one of the § Integrations. ☢️ Danger: It’s called evaluate because it evals JavaScript.Ĭompile and run MDX. When possible please use the async compile. Plain text 1:16-1:27 warning Emphasis should use `*` as a marker emphasis-marker remark-lintĬompile MDX to JS. Promise - Promise that resolves to the compiled JS as a vfile. This casing is used for hast elements, not for embedded MDX JSX nodes (components that someone authored manually). Specify casing to use for property names in style objects ( 'css' | 'dom, default: 'dom'). Specify casing to use for attribute names ( 'html' | 'react, default: 'react'). To illustrate with an example: when pragma is 'a.b' and pragmaImportSource is 'c' this following will be generated: import a from 'c'. When in the classic runtime, this is used to import the pragma function. Where to import the identifier of pragma from ( string?, default: 'react'). When in the classic runtime, this is used as an identifier for fragments: to React.createElement(React.Fragment). Pragma for JSX fragments ( string?, default: 'React.Fragment'). If file is the contents of example.mdx from § Use, then:ĭiff -/* classic React.createElement React.Fragment */ -import React from 'react' +/* classic preact.createElement preact.Fragment */ +import preact from 'preact/compat' -export const Thing = () => React.createElement(React.Fragment, null, 'World!') +export const Thing = () => preact.createElement(preact.Fragment, null, 'World!') The classic runtime compiles to calls such as h('p'), the automatic runtime compiles to import _jsx from '$importSource/jsx-runtime'\n_jsx('p'). JSX runtime to use ( 'automatic' | 'classic', default: 'automatic'). When an error is caught, we can use this lifecycle to react to any errors and display a nice error message or any other fallback content.JavaScript /* automatic react */ import )) + ? This includes errors that happened in a lifecycle hook but excludes any asynchronously thrown errors, like after a fetch() call. It's special because it allows you to handle any errors that happen during rendering. There is one lifecycle method that deserves a special recognition and that is componentDidCatch. See this diagram to get a visual overview of how they relate to each other. return value is passed to componentDidUpdate.ĬomponentDidUpdate(prevProps, prevState, snapshot) GetSnapshotBeforeUpdate(prevProps, prevState)Ĭalled just before render(). Return false to skip renderĬomponentWillUpdate(nextProps, nextState) ShouldComponentUpdate(nextProps, nextState)īefore render(). (deprecated) before the component gets mounted to the DOMĪfter the component gets mounted to the DOMĬomponentWillReceiveProps(nextProps, nextState)īefore new props get accepted (deprecated) Preact invokes the following lifecycle methods if they are defined for a Component: Lifecycle method If you've used HTML5 Custom Elements, this is similar to the attachedCallback and detachedCallback lifecycle methods. In order to have the clock's time update every second, we need to know when gets mounted to the DOM. Class Clock extends Component Run in REPL Lifecycle Methods
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