get(key) {
        const entry = this.map.get(key)
        const now = Date.now()

        if (entry) {
            if (entry.expire > now) {
                entry.expire = now + SKIP_TIME
                return entry.value
            }
            this.map.delete(key)
        }
        return null
    }
Get the cached value of the given key.
@param {any} key The key to get.
@returns {any} The cached value or null.