Files F100888124

global.js
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Created: Mon, Feb 3, 15:40

global.js
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	// @flow
	import * as React from 'react'
	import { withEmotionCache } from './context'
	import { ThemeContext } from './theming'
	import { insertStyles } from '@emotion/utils'
	import { isBrowser } from './utils'
	import { useInsertionEffectWithLayoutFallback } from '@emotion/use-insertion-effect-with-fallbacks'

	import { serializeStyles } from '@emotion/serialize'

	type Styles = Object \| Array<Object>

	type GlobalProps = {
	+styles: Styles \| (Object => Styles)
	}

	let warnedAboutCssPropForGlobal = false

	// maintain place over rerenders.
	// initial render from browser, insertBefore context.sheet.tags[0] or if a style hasn't been inserted there yet, appendChild
	// initial client-side render from SSR, use place of hydrating tag

	export let Global: React.AbstractComponent<GlobalProps> =
	/* #__PURE__ */ withEmotionCache((props: GlobalProps, cache) => {
	if (
	process.env.NODE_ENV !== 'production' &&
	!warnedAboutCssPropForGlobal && // check for className as well since the user is
	// probably using the custom createElement which
	// means it will be turned into a className prop
	// $FlowFixMe I don't really want to add it to the type since it shouldn't be used
	(props.className \|\| props.css)
	) {
	console.error(
	"It looks like you're using the css prop on Global, did you mean to use the styles prop instead?"
	)
	warnedAboutCssPropForGlobal = true
	}
	let styles = props.styles

	let serialized = serializeStyles(
	[styles],
	undefined,
	React.useContext(ThemeContext)
	)

	if (!isBrowser) {
	let serializedNames = serialized.name
	let serializedStyles = serialized.styles
	let next = serialized.next
	while (next !== undefined) {
	serializedNames += ' ' + next.name
	serializedStyles += next.styles
	next = next.next
	}

	let shouldCache = cache.compat === true

	let rules = cache.insert(
	``,
	{ name: serializedNames, styles: serializedStyles },
	cache.sheet,
	shouldCache
	)

	if (shouldCache) {
	return null
	}

	return (
	<style
	{...{
	[`data-emotion`]: `${cache.key}-global ${serializedNames}`,
	dangerouslySetInnerHTML: { __html: rules },
	nonce: cache.sheet.nonce
	}}
	/>
	)
	}

	// yes, i know these hooks are used conditionally
	// but it is based on a constant that will never change at runtime
	// it's effectively like having two implementations and switching them out
	// so it's not actually breaking anything

	let sheetRef = React.useRef()

	useInsertionEffectWithLayoutFallback(() => {
	const key = `${cache.key}-global`

	// use case of https://github.com/emotion-js/emotion/issues/2675
	let sheet = new cache.sheet.constructor({
	key,
	nonce: cache.sheet.nonce,
	container: cache.sheet.container,
	speedy: cache.sheet.isSpeedy
	})
	let rehydrating = false
	// $FlowFixMe
	let node: HTMLStyleElement \| null = document.querySelector(
	`style[data-emotion="${key} ${serialized.name}"]`
	)
	if (cache.sheet.tags.length) {
	sheet.before = cache.sheet.tags[0]
	}
	if (node !== null) {
	rehydrating = true
	// clear the hash so this node won't be recognizable as rehydratable by other <Global/>s
	node.setAttribute('data-emotion', key)
	sheet.hydrate([node])
	}
	sheetRef.current = [sheet, rehydrating]
	return () => {
	sheet.flush()
	}
	}, [cache])

	useInsertionEffectWithLayoutFallback(() => {
	let sheetRefCurrent = (sheetRef.current: any)
	let [sheet, rehydrating] = sheetRefCurrent
	if (rehydrating) {
	sheetRefCurrent[1] = false
	return
	}
	if (serialized.next !== undefined) {
	// insert keyframes
	insertStyles(cache, serialized.next, true)
	}

	if (sheet.tags.length) {
	// if this doesn't exist then it will be null so the style element will be appended
	let element = sheet.tags[sheet.tags.length - 1].nextElementSibling
	sheet.before = ((element: any): Element \| null)
	sheet.flush()
	}
	cache.insert(``, serialized, sheet, false)
	}, [cache, serialized.name])

	return null
	})

	if (process.env.NODE_ENV !== 'production') {
	Global.displayName = 'EmotionGlobal'
	}

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