@netlify/cache-utils/lib/expire.js

Utility for caching files in Netlify Build

const SECS_TO_MSECS = 1e3;
/**
 * Calculate the expiration date based on a time to leave in seconds
 * This might be used to retrieve the expiration date when caching a file
 */
export const getExpires = (timeToLeave) => {
    if (!Number.isInteger(timeToLeave) || timeToLeave < 1) {
        return;
    }
    return Date.now() + timeToLeave * SECS_TO_MSECS;
};
/**
 * Check if a expiredDate in milliseconds (retrieved by `Date.now`) has already expired
 * This might be used to check if a file is expired
 */
export const checkExpires = (expiredDate) => expiredDate !== undefined && Date.now() > expiredDate;