Get Key from ssl/ directory or selfsign

getkey.ts

import forge, { pki } from 'node-forge';
import fs from 'fs';

export interface KeyPair {
    cert: string,
    key: string
}

export function getKey(): KeyPair {
    if(!fs.existsSync('ssl/private.pem') || !fs.existsSync('ssl/certificate.pem')) {
        console.log("HTTPS Certificate not found on ssl/private.pem, ssl/certificate.pem");
        console.log("Generating Self-signed certificate, It may takes a while");
        let pki = forge.pki;
        let keys = pki.rsa.generateKeyPair(2048);
        let cert = pki.createCertificate();
        cert.publicKey = keys.publicKey;
        cert.serialNumber = '01';
        cert.validity.notBefore = new Date(91152000000);
        cert.validity.notAfter = new Date(253402300799000);
        let attrs = [{
            name: 'commonName',
            value: '*'
        }];
        cert.setSubject(attrs);
        cert.setIssuer(attrs);
        cert.sign(keys.privateKey, forge.md.sha256.create());
        return {
            cert: pki.certificateToPem(cert),
            key: pki.privateKeyToPem(keys.privateKey)
        } as KeyPair
    } else {
        return {
            cert: fs.readFileSync('ssl/certificate.pem').toString('utf-8'),
            key: fs.readFileSync('ssl/private.pem').toString('utf-8')
        } as KeyPair
    }
}