isValidNanoPattern

Signature

isValidNanoPattern(value: string): boolean

Validate whether a string is a nanosecond timestamp parseNanoseconds will parse.

• parseNanoseconds returns 0n for both "0" and garbage, so this is how the two are told apart — the check its own JSDoc asks callers to make.
• Shape and range: a canonical decimal integer (optional -, digits, no leading zeros) that also falls inside what Temporal.Instant can represent. Shape alone is nanosecondDecimal in regex/.
• Length is checked before BigInt, so an arbitrarily long payload string is rejected rather than converted.
• Takes the string value, not JSON text — JSON.parse(payload).observedAt, not the payload. A quoted "\"123\"" is not a decimal integer.
• Returns false for non-strings.

Parameters

Parameter	Type	Description
value	string	candidate decimal string form of a nanosecond timestamp

Returns

boolean indicating whether parseNanoseconds will parse it

Examples

import { isValidNanoPattern } from "@northguild/gmt/precision/validate";

isValidNanoPattern("1710072000123456789") // true

value

output

 

Source

precision/validate/isValidNanoPattern.ts