next-csrf/example/node_modules/next/dist/client/head-manager.js

CSRF mitigation library for Next.js

"use strict";exports.__esModule=true;exports.default=initHeadManager;const DOMAttributeNames={acceptCharset:'accept-charset',className:'class',htmlFor:'for',httpEquiv:'http-equiv'};function reactElementToDOM({type,props}){const el=document.createElement(type);for(const p in props){if(!props.hasOwnProperty(p))continue;if(p==='children'||p==='dangerouslySetInnerHTML')continue;// we don't render undefined props to the DOM
if(props[p]===undefined)continue;const attr=DOMAttributeNames[p]||p.toLowerCase();el.setAttribute(attr,props[p]);}const{children,dangerouslySetInnerHTML}=props;if(dangerouslySetInnerHTML){el.innerHTML=dangerouslySetInnerHTML.__html||'';}else if(children){el.textContent=typeof children==='string'?children:children.join('');}return el;}function updateElements(type,components){const headEl=document.getElementsByTagName('head')[0];const headCountEl=headEl.querySelector('meta[name=next-head-count]');if(process.env.NODE_ENV!=='production'){if(!headCountEl){console.error('Warning: next-head-count is missing. https://err.sh/next.js/next-head-count-missing');return;}}const headCount=Number(headCountEl.content);const oldTags=[];for(let i=0,j=headCountEl.previousElementSibling;i<headCount;i++,j=j.previousElementSibling){if(j.tagName.toLowerCase()===type){oldTags.push(j);}}const newTags=components.map(reactElementToDOM).filter(newTag=>{for(let k=0,len=oldTags.length;k<len;k++){const oldTag=oldTags[k];if(oldTag.isEqualNode(newTag)){oldTags.splice(k,1);return false;}}return true;});oldTags.forEach(t=>t.parentNode.removeChild(t));newTags.forEach(t=>headEl.insertBefore(t,headCountEl));headCountEl.content=(headCount-oldTags.length+newTags.length).toString();}function initHeadManager(){let updatePromise=null;return{mountedInstances:new Set(),updateHead:head=>{const promise=updatePromise=Promise.resolve().then(()=>{if(promise!==updatePromise)return;updatePromise=null;const tags={};head.forEach(h=>{const components=tags[h.type]||[];components.push(h);tags[h.type]=components;});const titleComponent=tags.title?tags.title[0]:null;let title='';if(titleComponent){const{children}=titleComponent.props;title=typeof children==='string'?children:children.join('');}if(title!==document.title)document.title=title;['meta','base','link','style','script'].forEach(type=>{updateElements(type,tags[type]||[]);});});}};}
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