TypeScript JSON.parse undefined

JSONFailGracefully.ts

const json = '{"foo": { "bar": { "baz": {"a": 1, "b": 2, "c": 3}}}}';

const parsedJSON = JSON.parse(json);
    
/*
 * DANGER! This line will run, but is not fail-safe, could crash if foo, bar, 
 * baz or a is missing or undefined
 */
console.log(parsedJSON.foo.bar.baz.a);

// This line will fail gracefully foo, bar, baz, or b is missing/undefined
console.log(parsedJSON?.foo?.bar?.baz?.b);

// This line fails gracefully
console.log(parsedJSON?.foo?.bar?.baz?.z);

// DANGER! DANGER! This line will crash
// console.log(parsedJSON?.foo?.bar?.baz?.x.y.z);