@tanstack/solid-router/dist/source/headContentUtils.jsx

Modern and scalable routing for Solid applications

import * as Solid from 'solid-js';
import { escapeHtml } from '@tanstack/router-core';
import { useRouter } from './useRouter';
import { useRouterState } from './useRouterState';
/**
 * Build the list of head/link/meta/script tags to render for active matches.
 * Used internally by `HeadContent`.
 */
export const useTags = () => {
    const router = useRouter();
    const nonce = router.options.ssr?.nonce;
    const routeMeta = useRouterState({
        select: (state) => {
            return state.matches.map((match) => match.meta).filter(Boolean);
        },
    });
    const meta = Solid.createMemo(() => {
        const resultMeta = [];
        const metaByAttribute = {};
        let title;
        const routeMetasArray = routeMeta();
        for (let i = routeMetasArray.length - 1; i >= 0; i--) {
            const metas = routeMetasArray[i];
            for (let j = metas.length - 1; j >= 0; j--) {
                const m = metas[j];
                if (!m)
                    continue;
                if (m.title) {
                    if (!title) {
                        title = {
                            tag: 'title',
                            children: m.title,
                        };
                    }
                }
                else if ('script:ld+json' in m) {
                    // Handle JSON-LD structured data
                    // Content is HTML-escaped to prevent XSS when injected via innerHTML
                    try {
                        const json = JSON.stringify(m['script:ld+json']);
                        resultMeta.push({
                            tag: 'script',
                            attrs: {
                                type: 'application/ld+json',
                            },
                            children: escapeHtml(json),
                        });
                    }
                    catch {
                        // Skip invalid JSON-LD objects
                    }
                }
                else {
                    const attribute = m.name ?? m.property;
                    if (attribute) {
                        if (metaByAttribute[attribute]) {
                            continue;
                        }
                        else {
                            metaByAttribute[attribute] = true;
                        }
                    }
                    resultMeta.push({
                        tag: 'meta',
                        attrs: {
                            ...m,
                            nonce,
                        },
                    });
                }
            }
        }
        if (title) {
            resultMeta.push(title);
        }
        if (router.options.ssr?.nonce) {
            resultMeta.push({
                tag: 'meta',
                attrs: {
                    property: 'csp-nonce',
                    content: router.options.ssr.nonce,
                },
            });
        }
        resultMeta.reverse();
        return resultMeta;
    });
    const links = useRouterState({
        select: (state) => {
            const constructed = state.matches
                .map((match) => match.links)
                .filter(Boolean)
                .flat(1)
                .map((link) => ({
                tag: 'link',
                attrs: {
                    ...link,
                    nonce,
                },
            }));
            const manifest = router.ssr?.manifest;
            const assets = state.matches
                .map((match) => manifest?.routes[match.routeId]?.assets ?? [])
                .filter(Boolean)
                .flat(1)
                .filter((asset) => asset.tag === 'link')
                .map((asset) => ({
                tag: 'link',
                attrs: { ...asset.attrs, nonce },
            }));
            return [...constructed, ...assets];
        },
    });
    const preloadLinks = useRouterState({
        select: (state) => {
            const preloadLinks = [];
            state.matches
                .map((match) => router.looseRoutesById[match.routeId])
                .forEach((route) => router.ssr?.manifest?.routes[route.id]?.preloads
                ?.filter(Boolean)
                .forEach((preload) => {
                preloadLinks.push({
                    tag: 'link',
                    attrs: {
                        rel: 'modulepreload',
                        href: preload,
                        nonce,
                    },
                });
            }));
            return preloadLinks;
        },
    });
    const styles = useRouterState({
        select: (state) => state.matches
            .map((match) => match.styles)
            .flat(1)
            .filter(Boolean).map(({ children, ...style }) => ({
            tag: 'style',
            attrs: {
                ...style,
                nonce,
            },
            children,
        })),
    });
    const headScripts = useRouterState({
        select: (state) => state.matches
            .map((match) => match.headScripts)
            .flat(1)
            .filter(Boolean).map(({ children, ...script }) => ({
            tag: 'script',
            attrs: {
                ...script,
                nonce,
            },
            children,
        })),
    });
    return () => uniqBy([
        ...meta(),
        ...preloadLinks(),
        ...links(),
        ...styles(),
        ...headScripts(),
    ], (d) => {
        return JSON.stringify(d);
    });
};
export function uniqBy(arr, fn) {
    const seen = new Set();
    return arr.filter((item) => {
        const key = fn(item);
        if (seen.has(key)) {
            return false;
        }
        seen.add(key);
        return true;
    });
}
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