138 lines
4 KiB
TypeScript
138 lines
4 KiB
TypeScript
export const DOMAttributeNames: Record<string, string> = {
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acceptCharset: 'accept-charset',
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className: 'class',
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htmlFor: 'for',
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httpEquiv: 'http-equiv',
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noModule: 'noModule',
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}
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function reactElementToDOM({ type, props }: JSX.Element): HTMLElement {
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const el: HTMLElement = document.createElement(type)
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for (const p in props) {
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if (!props.hasOwnProperty(p)) continue
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if (p === 'children' || p === 'dangerouslySetInnerHTML') continue
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// we don't render undefined props to the DOM
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if (props[p] === undefined) continue
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const attr = DOMAttributeNames[p] || p.toLowerCase()
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if (
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type === 'script' &&
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(attr === 'async' || attr === 'defer' || attr === 'noModule')
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) {
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;(el as HTMLScriptElement)[attr] = !!props[p]
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} else {
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el.setAttribute(attr, props[p])
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}
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}
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const { children, dangerouslySetInnerHTML } = props
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if (dangerouslySetInnerHTML) {
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el.innerHTML = dangerouslySetInnerHTML.__html || ''
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} else if (children) {
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el.textContent =
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typeof children === 'string'
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? children
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: Array.isArray(children)
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? children.join('')
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: ''
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}
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return el
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}
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function updateElements(type: string, components: JSX.Element[]): void {
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const headEl = document.getElementsByTagName('head')[0]
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const headCountEl: HTMLMetaElement = headEl.querySelector(
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'meta[name=next-head-count]'
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) as HTMLMetaElement
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if (process.env.NODE_ENV !== 'production') {
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if (!headCountEl) {
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console.error(
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'Warning: next-head-count is missing. https://nextjs.org/docs/messages/next-head-count-missing'
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)
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return
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}
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}
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const headCount = Number(headCountEl.content)
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const oldTags: Element[] = []
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for (
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let i = 0, j = headCountEl.previousElementSibling;
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i < headCount;
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i++, j = j!.previousElementSibling
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) {
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if (j!.tagName.toLowerCase() === type) {
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oldTags.push(j!)
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}
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}
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const newTags = (components.map(reactElementToDOM) as HTMLElement[]).filter(
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(newTag) => {
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for (let k = 0, len = oldTags.length; k < len; k++) {
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const oldTag = oldTags[k]
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if (oldTag.isEqualNode(newTag)) {
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oldTags.splice(k, 1)
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return false
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}
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}
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return true
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}
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)
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oldTags.forEach((t) => t.parentNode!.removeChild(t))
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newTags.forEach((t) => headEl.insertBefore(t, headCountEl))
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headCountEl.content = (headCount - oldTags.length + newTags.length).toString()
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}
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export default function initHeadManager(): {
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mountedInstances: Set<unknown>
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updateHead: (head: JSX.Element[]) => void
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} {
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let updatePromise: Promise<void> | null = null
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return {
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mountedInstances: new Set(),
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updateHead: (head: JSX.Element[]) => {
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const promise = (updatePromise = Promise.resolve().then(() => {
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if (promise !== updatePromise) return
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updatePromise = null
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const tags: Record<string, JSX.Element[]> = {}
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head.forEach((h) => {
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if (
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// If the font tag is loaded only on client navigation
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// it won't be inlined. In this case revert to the original behavior
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h.type === 'link' &&
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h.props['data-optimized-fonts'] &&
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!document.querySelector(
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`style[data-href="${h.props['data-href']}"]`
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)
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) {
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h.props.href = h.props['data-href']
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h.props['data-href'] = undefined
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}
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const components = tags[h.type] || []
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components.push(h)
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tags[h.type] = components
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})
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const titleComponent = tags.title ? tags.title[0] : null
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let title = ''
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if (titleComponent) {
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const { children } = titleComponent.props
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title =
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typeof children === 'string'
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? children
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: Array.isArray(children)
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? children.join('')
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: ''
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}
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if (title !== document.title) document.title = title
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;['meta', 'base', 'link', 'style', 'script'].forEach((type) => {
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updateElements(type, tags[type] || [])
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})
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}))
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},
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}
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}
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