typia/src/internal/_isTypeInt64Bigint.ts

Superfast runtime validators with only one line

export const _isTypeInt64Bigint = (value: bigint): boolean =>
  MINIMUM <= value && value <= MAXIMUM;

// Unlike the `number` path, a `bigint` represents both bounds exactly, so this
// is the true inclusive int64 range rather than an exclusive approximation.
//
// The arguments must stay strings. `BigInt(9223372036854775807)` rounds its
// `number` literal to `2 ** 63` before `BigInt` ever sees it, which is the
// defect this helper exists to close; `BigInt("9223372036854775807")` parses
// the digits directly and is exact.
const MINIMUM = -BigInt("9223372036854775808");
const MAXIMUM = BigInt("9223372036854775807");