Group by chipset object problem

groupByChipset.js

//Given an array of VIZIO TV models, create a "groupByChipset" function
//that aggregates the model names by their "chipset" field:
//Example input:
const tvs = [
{
"modelName": "VIZIO D24f-F1",
"chipset": "5581"
},
{
"modelName": "VIZIO V405-H9",
"chipset": "5691"
},
{
"modelName": "VIZIO V405-H8",
"chipset": "5691"
}
];

//Example output:
/*
const tvs = {
"5581": ["VIZIO D24f-F1"],
"5691": ["VIZIO V405-H9, VIZIO V405-H8"]
};
*/

const groupByChipset = (tvs) => 
    tvs.reduce( (acc, tv) => {
        const model = tv['modelName']
        const chipset = tv['chipset']
        chipsetModels = acc[chipset] ?? [model]
        if (!chipsetModels.includes(model)) {
            chipsetModels.push(model)
        }
        acc[chipset] = chipsetModels
        return acc
    }, {})

console.log(groupByChipset(tvs))