buildFromObjectByMapConfig

interface IDate {
    value: string;
}
const data: IDate = { value: '2' };
const sameData = { value: '2' };

// function mapObject<K extends string | number, T, U>(obj: Record<K, T>, f: (x: T) => U): Record<K, U>

/*
Simpler form of objToObj with strings
*/
function extract<
    Obj extends {[key: string]: string}
    >(data: {[key: string]: string}, obj: Obj): Obj {
    const result = Object.assign({}, obj);
    for (let i in obj) {
        if (!obj.hasOwnProperty(i)) {
            continue;
        }
        const key: string = obj[i]; // wtf?!
        const val: string = data[key];
        result[i] = val;
    }
    return result;
}


function objToObj<
    K extends string, T, Kc extends string
    >(obj: Record<K, T>, conf: Record<Kc, K>): Record<Kc, T> {
    const result: Record<Kc, T> = {} as any;
    for (let i in conf) {
        if (!conf.hasOwnProperty(i)) {
            continue;
        }
        const key: K = conf[i];
        const val: T = obj[key];
        result[i] = val;
    }
    return result;
}


var a: {value: string} = extract({'owe': 'value-2'}, {value: 'owe'});
var a: { value: string } = extract(data, {value: 'owe'});
var a: { value: string } = extract(sameData, {value: 'owe'});

var a: {value: string} = objToObj(data, {value: 'owe'});
var a: {value: string} = objToObj(sameData, {value: 'owe'});
var a: {value: string} = objToObj({'owe': 'value-2'}, {value: 'owe'});
var a /*: { value: string, num: number }*/ = objToObj(
    { 'owe': 'owe-value', 'wow': 1 },
    { value: 'owe', num: 'wow' }
);
var a: { value: string, num: number } = objToObj(
    { 'owe': 'owe-value', 'wow': 1 },
    { value: 'owe', num: 'wow' }
);
var a: { value: string|number, num: string|number } = objToObj(
    { 'owe': 'owe-value', 'wow': 1 },
    { value: 'owe', num: 'wow' }
);
var a: { value: string } = objToObj(
    { 'owe': 'owe-value', 'wow': 1 },
    { value: 'owe', num: 'wow' }
);
var a: { value: string|number } = objToObj(
    { 'owe': 'owe-value', 'wow': 1 },
    { value: 'owe', num: 'wow' }
);

console.log(a)
//console.log(data, rapidValidators, a)
document.getElementsByTagName('body')[0].innerText = JSON.stringify(a);

//console.log({...data})