oliverbooth.dev/src/ts/app.ts

declare const bootstrap: any;
declare const katex: any;

(() => {
    document.querySelectorAll("pre code").forEach((block) => {
        const content = block.textContent;
        if (content.split("\n").length > 1) {
            block.parentElement.classList.add("line-numbers");
        }
    });

    const list = document.querySelectorAll('[data-bs-toggle="tooltip"]');
    list.forEach((el: Element) => new bootstrap.Tooltip(el));

    window.onload = function () {
        const tex = document.getElementsByClassName("math");
        Array.prototype.forEach.call(tex, function (el) {
            let content = el.textContent.trim();
            if (content.startsWith("\\[")) content = content.slice(2);
            if (content.endsWith("\\]")) content = content.slice(0, -2);

            katex.render(content, el);
        });
    };
})();