safely deep set nested object properties

deepSet.ts

function deepSet(value: any, obj: object, ...path: string[]) {
    const target = path.slice(0, -1).reduce((p: any, k) => (p[k] = p[k] || {}), obj);
    path.slice(-1).forEach(k => target[k] = value);
}


let o;

deepSet(99, o = { a: { x: 88 } }, ...'a.b.c'.split('.'));
console.log(o);

deepSet(99, o = { a: {} }, 'a');
console.log(o);

deepSet(99, o = { a: {} });
console.log(o);