preload-links-by-lighthouse/dist/esm/lib/preload-link-generator.js

Generate html with embedded preload links using lighthouse

export const DEFAULT_HREF_MAPPER = (networkRecord) => networkRecord.url;
export const DEFAULT_AS_MAPPER = (networkRecord) => {
    if (networkRecord.resourceType === 'Script')
        return 'script';
    return undefined;
};
export function generatePreloadLinks(args) {
    const hrefMapper = args.hrefMapper ?? DEFAULT_HREF_MAPPER;
    const asMapper = args.asMapper ?? DEFAULT_AS_MAPPER;
    return args.networkRecords
        .map((networkRecord) => {
        const href = hrefMapper(networkRecord);
        const as = asMapper(networkRecord);
        if (href.startsWith('data')) {
            console.log(networkRecord);
        }
        let preloadLink = `<link rel="preload"`;
        preloadLink += ` href="${href}"`;
        if (as)
            preloadLink += ` as="${as}"`;
        preloadLink += `>`;
        return preloadLink;
    })
        .join('\n');
}
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