The clock-and-timer surface createCachedProbe runs on, bound to
a runtime.
readonly
hrtime: () => number
Monotonic clock in milliseconds — the runtime's hrtime. Measures the
cache TTL as an interval, never a wall-clock reading.
readonly
setTimer: (fn: () => void,ms: number) => TimerHandle
Timer used to bound each probe — the runtime's setTimeout.
readonly
clearTimer: (handle: TimerHandle) => void
Cancels a timer created by ProbeTiming.setTimer — the
runtime's clearTimeout.