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

Generate html with embedded preload links using lighthouse

(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define(["require", "exports"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.generatePreloadLinks = exports.DEFAULT_AS_MAPPER = exports.DEFAULT_HREF_MAPPER = void 0;
    const DEFAULT_HREF_MAPPER = (networkRecord) => networkRecord.url;
    exports.DEFAULT_HREF_MAPPER = DEFAULT_HREF_MAPPER;
    const DEFAULT_AS_MAPPER = (networkRecord) => {
        if (networkRecord.resourceType === 'Script')
            return 'script';
        return undefined;
    };
    exports.DEFAULT_AS_MAPPER = DEFAULT_AS_MAPPER;
    function generatePreloadLinks(args) {
        const hrefMapper = args.hrefMapper ?? exports.DEFAULT_HREF_MAPPER;
        const asMapper = args.asMapper ?? exports.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');
    }
    exports.generatePreloadLinks = generatePreloadLinks;
});
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