https://mtg.studio/js/domain/filename.js

1// @ts-check
2/**
3 * Build a safe download filename (pure): replace unsafe characters with underscores,
4 * collapse runs, trim leading/trailing separators, fall back to a default, and append
5 * the extension (avoiding a double dot).
6 * @param {string} name
7 * @param {string} [ext]  extension without the dot (e.g. 'csv')
8 * @returns {string}
9 */
10export function slugifyFilename(name, ext = '') {
11    let base = String(name || '')
12        .trim()
13        .replace(/[^\w.-]+/g, '_')
14        .replace(/_+/g, '_')
15        .replace(/^[_.]+|[_.]+$/g, '');
16    if (!base) base = 'export';
17    const e = String(ext || '').replace(/^\.+/, '');
18    return e ? `${base}.${e}` : base;
19}