JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = [
    {
    type: 'S',
    year: 'SW Walker'},
{
    type: 'C',
    year: 'SW Greth'},
{
    type: 'S',
    year: 'SW Karp'},
{
    type: 'C',
    year: 'SW Main'},
{
    type: 'H',
    year: 'SW Dummy'}
];

data.sort(function(a, b) {
    var order = 'SCH';
    var typeA = order.indexOf(a.type);
    var typeB = order.indexOf(b.type);

    if (typeA == typeB) {
        if (a.year < b.year) {
            return -1;
        } else if (a.year == b.year) {
            return 0;
        } else {
            return 1;
        }
    } else {
        return typeA - typeB;
    }
});

console.log(data);