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'use client' |
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import React, { useContext, type JSX } from 'react' |
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import Effect from './side-effect' |
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import { AmpStateContext } from './amp-context.shared-runtime' |
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import { HeadManagerContext } from './head-manager-context.shared-runtime' |
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import { isInAmpMode } from './amp-mode' |
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import { warnOnce } from './utils/warn-once' |
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type WithInAmpMode = { |
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inAmpMode?: boolean |
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} |
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export function defaultHead(inAmpMode = false): JSX.Element[] { |
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const head = [<meta charSet="utf-8" key="charset" />] |
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if (!inAmpMode) { |
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head.push( |
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<meta name="viewport" content="width=device-width" key="viewport" /> |
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) |
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} |
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return head |
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} |
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function onlyReactElement( |
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list: Array<React.ReactElement<any>>, |
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child: React.ReactElement | number | string |
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): Array<React.ReactElement<any>> { |
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if (typeof child === 'string' || typeof child === 'number') { |
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return list |
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} |
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if (child.type === React.Fragment) { |
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return list.concat( |
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React.Children.toArray(child.props.children).reduce( |
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( |
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fragmentList: Array<React.ReactElement<any>>, |
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fragmentChild: React.ReactElement | number | string |
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): Array<React.ReactElement<any>> => { |
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if ( |
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typeof fragmentChild === 'string' || |
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typeof fragmentChild === 'number' |
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) { |
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return fragmentList |
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} |
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return fragmentList.concat(fragmentChild) |
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}, |
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[] |
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) |
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) |
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} |
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return list.concat(child) |
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} |
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const METATYPES = ['name', 'httpEquiv', 'charSet', 'itemProp'] |
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function unique() { |
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const keys = new Set() |
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const tags = new Set() |
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const metaTypes = new Set() |
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const metaCategories: { [metatype: string]: Set<string> } = {} |
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return (h: React.ReactElement<any>) => { |
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let isUnique = true |
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let hasKey = false |
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if (h.key && typeof h.key !== 'number' && h.key.indexOf('$') > 0) { |
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hasKey = true |
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const key = h.key.slice(h.key.indexOf('$') + 1) |
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if (keys.has(key)) { |
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isUnique = false |
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} else { |
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keys.add(key) |
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} |
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} |
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switch (h.type) { |
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case 'title': |
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case 'base': |
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if (tags.has(h.type)) { |
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isUnique = false |
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} else { |
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tags.add(h.type) |
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} |
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break |
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case 'meta': |
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for (let i = 0, len = METATYPES.length; i < len; i++) { |
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const metatype = METATYPES[i] |
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if (!h.props.hasOwnProperty(metatype)) continue |
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if (metatype === 'charSet') { |
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if (metaTypes.has(metatype)) { |
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isUnique = false |
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} else { |
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metaTypes.add(metatype) |
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} |
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} else { |
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const category = h.props[metatype] |
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const categories = metaCategories[metatype] || new Set() |
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if ((metatype !== 'name' || !hasKey) && categories.has(category)) { |
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isUnique = false |
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} else { |
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categories.add(category) |
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metaCategories[metatype] = categories |
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} |
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} |
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} |
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break |
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} |
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return isUnique |
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} |
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} |
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function reduceComponents<T extends {} & WithInAmpMode>( |
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headChildrenElements: Array<React.ReactElement<any>>, |
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props: T |
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) { |
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const { inAmpMode } = props |
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return headChildrenElements |
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.reduce(onlyReactElement, []) |
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.reverse() |
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.concat(defaultHead(inAmpMode).reverse()) |
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.filter(unique()) |
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.reverse() |
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.map((c: React.ReactElement<any>, i: number) => { |
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const key = c.key || i |
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if (process.env.NODE_ENV === 'development') { |
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if (c.type === 'script' && c.props['type'] !== 'application/ld+json') { |
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const srcMessage = c.props['src'] |
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? `<script> tag with src="${c.props['src']}"` |
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: `inline <script>` |
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warnOnce( |
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`Do not add <script> tags using next/head (see ${srcMessage}). Use next/script instead. \nSee more info here: https://nextjs.org/docs/messages/no-script-tags-in-head-component` |
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) |
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} else if (c.type === 'link' && c.props['rel'] === 'stylesheet') { |
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warnOnce( |
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`Do not add stylesheets using next/head (see <link rel="stylesheet"> tag with href="${c.props['href']}"). Use Document instead. \nSee more info here: https://nextjs.org/docs/messages/no-stylesheets-in-head-component` |
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) |
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} |
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} |
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return React.cloneElement(c, { key }) |
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}) |
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} |
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function Head({ children }: { children: React.ReactNode }) { |
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const ampState = useContext(AmpStateContext) |
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const headManager = useContext(HeadManagerContext) |
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return ( |
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<Effect |
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reduceComponentsToState={reduceComponents} |
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headManager={headManager} |
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inAmpMode={isInAmpMode(ampState)} |
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> |
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{children} |
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</Effect> |
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) |
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} |
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export default Head |
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