TypeScript compatible live browser test for duplicate element ids via http://stackoverflow.com/questions/482763/jquery-to-check-for-duplicate-ids-in-a-dom

gistfile1.ts

export function dupTest() {
    var elms = document.getElementsByTagName( "*" ), i, len, ids = {}, id;
    for( i = 0, len = elms.length; i < len; i += 1 ){
        id = elms[ i ][ 'id' ] || null;
        if( id ){
            ids[ id ] = ids.hasOwnProperty( id ) ? ids[ id ] +=1 : 0;
        }
    }
    for( id in ids ){
        if( ids.hasOwnProperty( id ) ){
            if( ids[ id ] ){
                console.warn( "Duplicate ID #" + id );
            }
        }
    }
}