next/dist/esm/lib/create-client-router-filter.js

The React Framework

import { BloomFilter } from '../shared/lib/bloom-filter';
import { isDynamicRoute } from '../shared/lib/router/utils';
import { removeTrailingSlash } from '../shared/lib/router/utils/remove-trailing-slash';
import { tryToParsePath } from './try-to-parse-path';
import { extractInterceptionRouteInformation, isInterceptionRouteAppPath } from '../shared/lib/router/utils/interception-routes';
import { DYNAMIC_FILTER_PLACEHOLDER } from '../shared/lib/router/utils/dynamic-filter-pattern';
export function createClientRouterFilter(paths, redirects, allowedErrorRate) {
    const staticPaths = new Set();
    const dynamicPaths = new Set();
    for (let path of paths){
        if (isDynamicRoute(path)) {
            if (isInterceptionRouteAppPath(path)) {
                path = extractInterceptionRouteInformation(path).interceptedRoute;
            }
            let subPath = '';
            const pathParts = path.split('/');
            // start at 1 since we split on '/' and the path starts
            // with this so the first entry is an empty string
            for(let i = 1; i < pathParts.length; i++){
                const curPart = pathParts[i];
                if (curPart.startsWith('[')) {
                    break;
                }
                subPath = `${subPath}/${curPart}`;
            }
            if (subPath) {
                dynamicPaths.add(subPath);
            } else {
                // The route begins with a dynamic segment, so it has no static
                // prefix to anchor the prefix-based dynamic filter on (e.g.
                // `/[locale]/about`). Store its normalized pattern instead so the
                // client can still detect it when a pages dynamic route would
                // otherwise shadow it.
                dynamicPaths.add(normalizeRouteToFilterPattern(path));
            }
        } else {
            staticPaths.add(path);
        }
    }
    for (const redirect of redirects){
        const { source } = redirect;
        const path = removeTrailingSlash(source);
        let tokens = [];
        try {
            tokens = tryToParsePath(source).tokens || [];
        } catch  {}
        if (tokens.every((token)=>typeof token === 'string')) {
            // only include static redirects initially
            staticPaths.add(path);
        }
    }
    const staticFilter = BloomFilter.from([
        ...staticPaths
    ], allowedErrorRate);
    const dynamicFilter = BloomFilter.from([
        ...dynamicPaths
    ], allowedErrorRate);
    const data = {
        staticFilter: staticFilter.export(),
        dynamicFilter: dynamicFilter.export()
    };
    return data;
}
/**
 * Replace every dynamic segment of a route with the placeholder token, e.g.
 * `/[locale]/about` -> `/[]/about`, `/[lang]` -> `/[]`. This is the encode half
 * of the dynamic filter; the pages router decodes it with
 * `hasDynamicFilterCandidate`, and both rely on `DYNAMIC_FILTER_PLACEHOLDER`.
 */ function normalizeRouteToFilterPattern(route) {
    return route.split('/').map((segment)=>segment.startsWith('[') ? DYNAMIC_FILTER_PLACEHOLDER : segment).join('/');
}

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