How to use datepipe outside of a component.ts in angular?

I have a typescript file used to export some constant variables (export const). I would like to use datepipe to format date in the ts file, but I do not know how to add service to use datepipe in a non component ts file.

For example:

export const dateObject = [
{
value: {
start: new Date(),
end: new Date().setFullYear(new Date().getFullYear() + 10),
},
title: 'Ten Years Later'
}
];


How can I make datepipe.transform(, 'yyyy-MM-dd') work in this typescript?

Thank you!!

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