Yea, the TypeScript makes it complicated. Here a scrapping of the compiled JS from Balter’s site (I tested locally and it seemed to be working):

```
Suggestion: <span id="four-oh-four-suggestion"><span>
<script>
const En = new Uint32Array(65536),
Sn = (t, e) => {
if (t.length < e.length) {
const n = e;
e = t,
t = n
}
return 0 === e.length ? t.length : t.length <= 32 ? ((t, e) => {
const n = t.length,
i = e.length,
r = 1 << n - 1;
let s = -1,
o = 0,
a = n,
c = n;
for (; c--;)
En[t.charCodeAt(c)] |= 1 << c;
for (c = 0; c < i; c++) {
let t = En[e.charCodeAt(c)];
const n = t | o;
t |= (t & s) + s ^ s,
o |= ~(t | s),
s &= t,
o & r && a++,
s & r && a--,
o = o << 1 | 1,
s = s << 1 | ~(n | o),
o &= n
}
for (c = n; c--;)
En[t.charCodeAt(c)] = 0;
return a
})(t, e) : ((t, e) => {
const n = e.length,
i = t.length,
r = [],
s = [],
o = Math.ceil(n / 32),
a = Math.ceil(i / 32);
for (let t = 0; t < o; t++)
s[t] = -1,
r[t] = 0;
let c = 0;
for (; c < a - 1; c++) {
let o = 0,
a = -1;
const l = 32 * c,
u = Math.min(32, i) + l;
for (let e = l; e < u; e++)
En[t.charCodeAt(e)] |= 1 << e;
for (let t = 0; t < n; t++) {
const n = En[e.charCodeAt(t)],
i = s[t / 32 | 0] >>> t & 1,
c = r[t / 32 | 0] >>> t & 1,
l = n | o,
u = ((n | c) & a) + a ^ a | n | c;
let h = o | ~(u | a),
d = a & u;
h >>> 31 ^ i && (s[t / 32 | 0] ^= 1 << t),
d >>> 31 ^ c && (r[t / 32 | 0] ^= 1 << t),
h = h << 1 | i,
d = d << 1 | c,
a = d | ~(l | h),
o = h & l
}
for (let e = l; e < u; e++)
En[t.charCodeAt(e)] = 0
}
let l = 0,
u = -1;
const h = 32 * c,
d = Math.min(32, i - h) + h;
for (let e = h; e < d; e++)
En[t.charCodeAt(e)] |= 1 << e;
let f = i;
for (let t = 0; t < n; t++) {
const n = En[e.charCodeAt(t)],
o = s[t / 32 | 0] >>> t & 1,
a = r[t / 32 | 0] >>> t & 1,
c = n | l,
h = ((n | a) & u) + u ^ u | n | a;
let d = l | ~(h | u),
m = u & h;
f += d >>> i - 1 & 1,
f -= m >>> i - 1 & 1,
d >>> 31 ^ o && (s[t / 32 | 0] ^= 1 << t),
m >>> 31 ^ a && (r[t / 32 | 0] ^= 1 << t),
d = d << 1 | o,
m = m << 1 | a,
u = m | ~(c | d),
l = d & c
}
for (let e = h; e < d; e++)
En[t.charCodeAt(e)] = 0;
return f
})(t, e)
};
const e = document.getElementById("four-oh-four-suggestion");
if (null != e) {
const t = new XMLHttpRequest;
t.onload = () => {
if (200 === t.status) {
const n = t.responseXML,
i = Array.from(n.querySelectorAll("urlset > url > loc")).map((t => t.textContent)),
r = new URL(((t, e) => {
let n = 1 / 0,
i = 0;
for (let r = 0; r < e.length; r++) {
const s = Sn(t, e[r]);
s < n && (n = s, i = r)
}
return e[i]
})(window.location.href, i));
e.innerHTML = `<a href="${r.href}">${r.pathname}</a>`
} else
e.innerHTML = '<a href="/">/</a>'
},
t.open("GET", `${window.location.protocol}//${window.location.host}/sitemap.xml`),
t.send()
}
</script>
```