'use client';
import { jsx as _jsx } from "react/jsx-runtime";
import React, { useContext } from 'react';
import Effect from './side-effect';
import { HeadManagerContext } from './head-manager-context.shared-runtime';
import { warnOnce } from './utils/warn-once';
export function defaultHead() {
    const head = [
        /*#__PURE__*/ _jsx("meta", {
            charSet: "utf-8"
        }, "charset"),
        /*#__PURE__*/ _jsx("meta", {
            name: "viewport",
            content: "width=device-width"
        }, "viewport")
    ];
    return head;
}
function onlyReactElement(list, child) {
    // React children can be "string" or "number" in this case we ignore them for backwards compat
    if (typeof child === 'string' || typeof child === 'number') {
        return list;
    }
    // Adds support for React.Fragment
    if (child.type === React.Fragment) {
        return list.concat(// @ts-expect-error @types/react does not remove fragments but this could also return ReactPortal[]
        React.Children.toArray(child.props.children).reduce(// @ts-expect-error @types/react does not remove fragments but this could also return ReactPortal[]
        (fragmentList, fragmentChild)=>{
            if (typeof fragmentChild === 'string' || typeof fragmentChild === 'number') {
                return fragmentList;
            }
            return fragmentList.concat(fragmentChild);
        }, []));
    }
    return list.concat(child);
}
const METATYPES = [
    'name',
    'httpEquiv',
    'charSet',
    'itemProp'
];
/*
 returns a function for filtering head child elements
 which shouldn't be duplicated, like <title/>
 Also adds support for deduplicated `key` properties
*/ function unique() {
    const keys = new Set();
    const tags = new Set();
    const metaTypes = new Set();
    const metaCategories = {};
    return (h)=>{
        let isUnique = true;
        let hasKey = false;
        if (h.key && typeof h.key !== 'number' && h.key.indexOf('$') > 0) {
            hasKey = true;
            const key = h.key.slice(h.key.indexOf('$') + 1);
            if (keys.has(key)) {
                isUnique = false;
            } else {
                keys.add(key);
            }
        }
        // eslint-disable-next-line default-case
        switch(h.type){
            case 'title':
            case 'base':
                if (tags.has(h.type)) {
                    isUnique = false;
                } else {
                    tags.add(h.type);
                }
                break;
            case 'meta':
                for(let i = 0, len = METATYPES.length; i < len; i++){
                    const metatype = METATYPES[i];
                    if (!h.props.hasOwnProperty(metatype)) continue;
                    if (metatype === 'charSet') {
                        if (metaTypes.has(metatype)) {
                            isUnique = false;
                        } else {
                            metaTypes.add(metatype);
                        }
                    } else {
                        const category = h.props[metatype];
                        const categories = metaCategories[metatype] || new Set();
                        if ((metatype !== 'name' || !hasKey) && categories.has(category)) {
                            isUnique = false;
                        } else {
                            categories.add(category);
                            metaCategories[metatype] = categories;
                        }
                    }
                }
                break;
        }
        return isUnique;
    };
}
/**
 *
 * @param headChildrenElements List of children of <Head>
 */ function reduceComponents(headChildrenElements) {
    return headChildrenElements.reduce(onlyReactElement, []).reverse().concat(defaultHead().reverse()).filter(unique()).reverse().map((c, i)=>{
        const key = c.key || i;
        if (process.env.NODE_ENV === 'development') {
            // omit JSON-LD structured data snippets from the warning
            if (c.type === 'script' && c.props['type'] !== 'application/ld+json') {
                const srcMessage = c.props['src'] ? `<script> tag with src="${c.props['src']}"` : `inline <script>`;
                warnOnce(`Do not add <script> tags using next/head (see ${srcMessage}). Use next/script instead. \nSee more info here: https://nextjs.org/docs/messages/no-script-tags-in-head-component`);
            } else if (c.type === 'link' && c.props['rel'] === 'stylesheet') {
                warnOnce(`Do not add stylesheets using next/head (see <link rel="stylesheet"> tag with href="${c.props['href']}"). Use Document instead. \nSee more info here: https://nextjs.org/docs/messages/no-stylesheets-in-head-component`);
            }
        }
        return /*#__PURE__*/ React.cloneElement(c, {
            key
        });
    });
}
/**
 * This component injects elements to `<head>` of your page.
 * To avoid duplicated `tags` in `<head>` you can use the `key` property, which will make sure every tag is only rendered once.
 */ function Head({ children }) {
    const headManager = useContext(HeadManagerContext);
    return /*#__PURE__*/ _jsx(Effect, {
        reduceComponentsToState: reduceComponents,
        headManager: headManager,
        children: children
    });
}
export default Head;

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