add typescript support in svelte files, .js to .ts

src/lib/auth.ts

@@ -0,0 +1,29 @@
+import jwt from 'jsonwebtoken';
+
+import config from '$lib/config';
+
+const SECRET = config.jwt.secret;
+const EXPIRES_IN = config.jwt.expiresIn;
+
+const AUTH = config.auth;
+
+export function createToken(userData) {
+	return jwt.sign(userData, SECRET, { expiresIn: EXPIRES_IN });
+}
+
+export function decryptToken(token) {
+	return jwt.verify(token, SECRET);
+}
+
+export function authenticate(user, pass) {
+	let userData = null;
+
+	if (AUTH[user]) {
+		const { password, ...data } = AUTH[user];
+		if (password && password === pass) userData = data;
+	}
+
+	if (userData == null) return null;
+
+	return createToken({ id: user, ...userData });
+}