It appears that the repository has undergone several changes and renamings:

backend/node_modules/escalade/sync/index.d.mts

@@ -1,9 +0,0 @@
-export type Callback = (
-	directory: string,
-	files: string[],
-) => string | false | void;
-
-export default function (
-	directory: string,
-	callback: Callback,
-): string | void;

backend/node_modules/escalade/sync/index.d.ts

@@ -1,13 +0,0 @@
-declare namespace escalade {
-	export type Callback = (
-		directory: string,
-		files: string[],
-	) => string | false | void;
-}
-
-declare function escalade(
-	directory: string,
-	callback: escalade.Callback,
-): string | void;
-
-export = escalade;

backend/node_modules/escalade/sync/index.js

@@ -1,18 +0,0 @@
-const { dirname, resolve } = require('path');
-const { readdirSync, statSync } = require('fs');
-
-module.exports = function (start, callback) {
-	let dir = resolve('.', start);
-	let tmp, stats = statSync(dir);
-
-	if (!stats.isDirectory()) {
-		dir = dirname(dir);
-	}
-
-	while (true) {
-		tmp = callback(dir, readdirSync(dir));
-		if (tmp) return resolve(dir, tmp);
-		dir = dirname(tmp = dir);
-		if (tmp === dir) break;
-	}
-}

backend/node_modules/escalade/sync/index.mjs

@@ -1,18 +0,0 @@
-import { dirname, resolve } from 'path';
-import { readdirSync, statSync } from 'fs';
-
-export default function (start, callback) {
-	let dir = resolve('.', start);
-	let tmp, stats = statSync(dir);
-
-	if (!stats.isDirectory()) {
-		dir = dirname(dir);
-	}
-
-	while (true) {
-		tmp = callback(dir, readdirSync(dir));
-		if (tmp) return resolve(dir, tmp);
-		dir = dirname(tmp = dir);
-		if (tmp === dir) break;
-	}
-}