Error: Text.replace Is Not A Function In Angularjs Filter, How To Fix This?

in the angular i trying to use filter in angular to replace some string with another word that it can find, i already try many example, i think my code is just missing something, but i can't figure it out. Here is my code :

here is my app.js

    app.filter('filterStatus', function () {
    return function (text) {

        if(text == 1){
            return str = text.replace(/1/g, "Waiting");
        } else if (text == 2) {
            return str = text.replace(/2/g, "On Process");
        } else if (text == 3) {
            return str = text.replace(/3/g, "On The Way");
        } else if (text == 4) {
            return str = text.replace(/4/g, "Delivered");
        } else if (text == 5) {
            return str = text.replace(/5/g, "Expired");
        }
    };
});

i going to replace "1" with "Waiting" word, here is my html page

            <tr ng-repeat-start="siheaders in singleID.siheader">
                <td>{{siheaders.status | filterStatus}}</td>
            </tr>

but it give me these "Error: text.replace is not a function" error when i use firebug to debug it, what am i missed here?

There's really no need to do any string replacement.

app.filter('filterStatus', function () {
    return function (text) {
        if(text == 1){
            return "Waiting";
        } else if (text == 2) {
            return "On Process";
        } else if (text == 3) {
            return "On The Way";
        } else if (text == 4) {
            return "Delivered";
        } else if (text == 5) {
            return "Expired";
        }
    };
}