const config = { retries: 0, timeout: null, name: '' };
const a = config.retries || 5;
const b = config.timeout ?? 10;
const c = config.name || 'default';
const d = config.missing?.value ?? 'fallback';
let calls = 0;
const sideEffect = () => { calls++; return true; };
const e = config.retries && sideEffect();
console.log(a, b, c, d, e, calls);