[рони]

dc65k,

<pre>

    <script>
const array = [{
        '2021-07-01': {
            'products': [1661.28, 229],
        },
    },
    {
        '2021-07-02': {
            'fare': [66, 78],
            'products': 218,
        }
    },
    {
        '2021-07-03': {
            'fare': 78,
            'products': 909.80,
        }
    },
    {
        '2021-07-05': {
            'water': 840,
            'products': 1021.61,
        },
    },
]
const calculate = array => Object.entries(array.reduce((obj, a) => {
    let [key, value] = Object.entries(a)[0], sum = 0;
    for (let k in value) {
        k in obj || (obj[k] = 0);
        let temp = value[k];
        if(Array.isArray(temp)) temp = temp.reduce((a, b) => a + b, 0);
        obj[k] += temp;
        sum += temp
    }
    obj[key] = sum;
    obj.total += sum;
    return obj
}, { total: 0 })).map(([a, b]) => ({[a]: b.toFixed(2)}))
document.write(JSON.stringify(calculate(array), "", 1));
</script></pre>