How do I format currencies in a Vue component?

I have created a filter. The filter can be used in any page.

Vue.filter('toCurrency', function (value) {
    if (typeof value !== "number") {
        return value;
    }
    var formatter = new Intl.NumberFormat('en-US', {
        style: 'currency',
        currency: 'USD'
    });
    return formatter.format(value);
});

Then I can use this filter like this:

        <td class="text-right">
            {{ invoice.fees | toCurrency }}
        </td>

I used these related answers to help with the implementation of the filter:

• How to format numbers as currency strings
• Check whether variable is number or string in JavaScript