Function compareVersions

src/upgrade/index.ts:169–181

(a: string, b: string)

/** Returns >0 if a>b, <0 if a<b, 0 if equal. Throws on unparseable input. */
export function compareVersions(a: string, b: string): number {
  const sa = parseSemver(a);
  const sb = parseSemver(b);
  if (!sa || !sb) throw new Error(`cannot compare versions: "${a}" vs "${b}"`);
  if (sa.major !== sb.major) return sa.major - sb.major;
  if (sa.minor !== sb.minor) return sa.minor - sb.minor;
  if (sa.patch !== sb.patch) return sa.patch - sb.patch;
  // A prerelease is "less than" its release (1.0.0-rc < 1.0.0).
  if (sa.pre && !sb.pre) return -1;
  if (!sa.pre && sb.pre) return 1;
  if (sa.pre && sb.pre) return sa.pre < sb.pre ? -1 : sa.pre > sb.pre ? 1 : 0;
  return 0;
}

export function isUpdateAvailable(current: string, latest: string): boolean {
  try {