Function getTokenExpiry

getTokenExpiry(response: AniListTokenResponse, now?: number): Date
Computes the absolute expiry time of a token response.

Combine this with refreshAccessToken to refresh proactively before the access token expires instead of waiting for a 401 from the API.
Parameters
- response: AniListTokenResponse
  The token response to compute the expiry for.
- Optionalnow: number
  The current time in milliseconds since the Unix epoch. Defaults to the time at which the helper is called.
Returns Date
The moment the access token expires.
Throws
A TypeError when expires_in is not a positive finite number. 0, negative, NaN, or Infinity values produce an already-expired or nonsensical expiry that breaks proactive-refresh scheduling without any visible error (and is one comparison-operator slip away from a refresh loop), so they are rejected instead.
Example
```
const token = await getAccessToken("1234", "secret", "code-from-redirect");
if (Date.now() >= getTokenExpiry(token).getTime() - 60_000) {
    const refreshed = await refreshAccessToken("1234", "secret", storedRefreshToken);
}
```
- Defined in apis/graphql/anilist/auth.ts:179