const f = obj => Object.entries(obj).map(e => e[1].map(x => [e[0], x])).reduce((acc, val) => acc.map(ai => val.map(bi => [ai, bi].flat())).flat()).map(e => e.reduce((acc, xi, j) => (j >>= 1, acc[j] = acc[j] || [], acc[j].push(xi), acc), [])).map(Object.fromEntries)

function f1(inp) {
    let en = Object.entries(inp);
    let keys = en.map(x => x[0])
    let ls = en.map(x => x[1].length);
    let total = ls.reduce((a,x) => a * x);
    let ar = keys.map(_ => 0);
    let al = keys.length;
    let results = [];
    for (let j = 0; j < total; j++) {
        let temp = {}
        for (let i = 0; i < al; i++) {
            if (ar[i] === ls[i]) {
                ar[i] = 0;
                if (i < al - 1) {
                    ar[i + 1]++;
                }
            }
            temp[keys[i]] = inp[keys[i]][ar[i]];
        }
        results.push(temp);
        ar[0]++;
    }
    return results;
}

const func = o => Object.entries(o).reduce((acc, [key, values]) => acc.reduce((acc, item) => [...acc, ...values.map(value => ({ ...item, [key]: value }))], []), [{}])