API reference › @evolu/common › Schedule › fibonacci

function fibonacci(
  initial: Duration,
): Schedule<
  number &
    Brand<"Int"> &
    Brand<"NonNegative"> &
    Brand<"LessThan281474976710655"> &
    Brand<"Millis">
>;

Defined in: packages/common/src/Schedule.ts:308

Fibonacci backoff schedule.

Delays follow the Fibonacci sequence, growing more slowly than exponential:

• Attempt 1: initial
• Attempt 2: initial
• Attempt 3: initial * 2
• Attempt 4: initial * 3
• Attempt 5: initial * 5
• ...

Never stops — combine with take or maxElapsed to limit.

Example

// 100ms, 100ms, 200ms, 300ms, 500ms, 800ms, ...
const fib = fibonacci("100ms");