Function isAuthenticated

Checks if the user is authenticated with valid tokens

Performs a comprehensive authentication check that verifies:

1. Both access and refresh tokens exist
2. The access token has not expired

This function serves as the definitive authority on authentication status throughout the application, providing a single source of truth for determining if the user can make authenticated requests.

// Protect a feature that requires authentication
if (isAuthenticated()) {
  // Show authenticated content
  showUserProfile();
} else {
  // Show unauthenticated state
  showLoginButton();
}
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export function isAuthenticated(): boolean {
  const accessToken = getAccessToken();
  const refreshToken = getRefreshToken();

  // Check if both tokens exist
  if (!accessToken || !refreshToken) {
    return false;
  }

  // Check if token has expired
  const expiry = getTokenExpiry();
  if (expiry && expiry <= Date.now()) {
    return false;
  }

  return true;
}
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