User:Username/BlockAbuser.js

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mw.loader.using( [ 'mediawiki.util' ] ).then( function () {

    // Only run on Special:AbuseFilter
    if ( mw.config.get( 'wgCanonicalSpecialPageName' ) !== 'AbuseFilter' ) {
        return;
    }

    const seenUsers = new Set();

    // Very strict IPv4 / IPv6 detection
    const ipRegex = /^(?:\d{1,3}\.){3}\d{1,3}$|:/;

    // Find all links inside the abuse log table/content
    $( '#mw-content-text a' ).each( function () {
        const $link = $( this );
        const href = $link.attr( 'href' );
        const text = $link.text();

        if ( !href || !text ) {
            return;
        }

        // Only User: links
        if ( !href.includes( '/wiki/User:' ) ) {
            return;
        }