Filter an array with TypeScript in Angular

How Can I use Filter() function of typescript to inspect inner property of JSON object

How to get only those nodes whose sales property is true?

Like in the below case I need only id:54 record because there is one department whose sales is true, while ID 56 does not have any department whose sales property is true so it should be neglected.

{
    "id": 54,
    "firstName": "Data",
    "departmentAccess": [
        {
            "departmentId": 1118,
            "departmentName": "Hyundai - New Cars",
            "departmentCode": "HY - NEW",
            "sales": true,
            "trade": true
        },
        {
            "departmentId": 1119,
            "departmentName": "Jaguar & Land Rover - New Cars",
            "departmentCode": "Jag & LR",
            "sales": false,
            "trade": true
        }
    ]
},
{
    "id": 56,
    "firstName": "Peter",
    "departmentAccess": [
        {
            "departmentId": 1118,
            "departmentName": "Hyundai - New Cars",
            "departmentCode": "HY - NEW",
            "sales": false,
            "trade": false
        },
        {
            "departmentId": 1119,
            "departmentName": "Jaguar & Land Rover - New Cars",
            "departmentCode": "Jag & LR",
            "sales": false,
            "trade": false
        }
    ]
}