version-compare/source/index.ts

Comparator to determine if a version is less than, equivalent to, or greater than another version

export type Version = string | number
export enum VersionIs {
	LessThan = -1,
	EqualTo = 0,
	GreaterThan = 1,
}

/**
 * Compare two versions quickly.
 * @param current Is this version greater, equal to, or less than the other?
 * @param other The version to compare against the current version
 * @returns 1 if current is greater than other, 0 if they are equal or equivalent, and -1 if current is less than other
 */
export default function versionCompare(
	current: Version,
	other: Version
): VersionIs {
	const cp = String(current).split('.')
	const op = String(other).split('.')
	for (let depth = 0; depth < Math.min(cp.length, op.length); depth++) {
		const cn = Number(cp[depth])
		const on = Number(op[depth])
		if (cn > on) return VersionIs.GreaterThan
		if (on > cn) return VersionIs.LessThan
		if (!isNaN(cn) && isNaN(on)) return VersionIs.GreaterThan
		if (isNaN(cn) && !isNaN(on)) return VersionIs.LessThan
	}
	return VersionIs.EqualTo
}