[рони]

PetrIII,

let data = [{
    val1: 0,
    val2: 0,
    val3: 0,
    year: "2018"
}, {
    val1: 1,
    val2: 1,
    val3: 1,
    year: "2019"
}];
let arr = data.reduce((obj, elem) => {
    let {year, ...el} = elem;
    for (let key in el) {
        let ob = obj[key];
        if (!ob) {
            ob = obj[key] = {Name: key};
            obj.arr.push(ob)
        };
        ob[year] = el[key];
    };
    return obj;
}, {arr: []}).arr
console.log(arr)