Function parseNanos

repos/effect/packages/effect/src/Duration.ts:41–42

(input: string, scale: bigint)

  BigInt(input < 0 ? Math.ceil(input - 0.5) : Math.floor(input + 0.5))

const roundMillisToNanos = (millis: number): bigint => roundTiesAwayFromZero(millis * 1_000_000)

const parseNanos = (input: string, scale: bigint): bigint => {
  const decimalIndex = input.indexOf(".")
  if (decimalIndex === -1) return BigInt(input) * scale