[Aetae]

arr = [
    {
        "id": 1,
        "type": "internal",
        "text": "Text",
        "checked":false,
        "disabled":false
    },
    {
        "id": 2,
        "type": "external",
        "text": "Text2",
        "checked":true,
        "disabled":false
    },
    {
        "id": 3,
        "type": "internal",
        "text": "Text3",
        "checked":false,
        "disabled":true
    },
    {
        "id": 4,
        "type": "internal",
        "text": "Text4444",
        "checked":false,
        "disabled":false
    },
    {
        "id": 5,
        "type": "external",
        "text": "Text55555",
        "checked":true,
        "disabled":true
    }
];

function diffByType(arr){
	var out = [[],[]];
	arr.forEach(function(elem){
		out[+(elem.type === 'external')].push(elem);
	});
	return out
}


alert(JSON.stringify(diffByType(arr),null,'\t'))