Interface SnackbarOptions

Trailing action button, e.g. a Cancel for the work being reported.

Auto-close duration in milliseconds.

• undefined → uses default duration
• null or 0 → does not auto-close (stays until user closes)

Optional key to de-duplicate snackbars. If provided with replace: true, any existing snackbar with the same key will be closed first.

How far the work has got, 0–100 (clamped). Draws a 24px ring ahead of the message: the value is the length of the ring's arc, and that arc spins for as long as the snackbar is up, so the ring reads as busy while still showing how much is done. Omit for no ring. Pair with duration: null so the snackbar stays up for as long as the work runs.

When used with key, controls whether to replace an existing keyed snackbar. Default: false (do nothing if a snackbar with the same key is already visible).