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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.import type { ReleaseType, SemVer } from "./types.ts";import { compareIdentifier } from "./_shared.ts";
/** * Returns difference between two versions by the release type, or `undefined` if the versions are the same. */export function difference(s0: SemVer, s1: SemVer): ReleaseType | undefined {  const hasPrerelease = s0.prerelease?.length || s1.prerelease?.length;
  if (s0.major !== s1.major) return hasPrerelease ? "premajor" : "major";  if (s0.minor !== s1.minor) return hasPrerelease ? "preminor" : "minor";  if (s0.patch !== s1.patch) return hasPrerelease ? "prepatch" : "patch";
  if (compareIdentifier(s0.prerelease, s1.prerelease) !== 0) {    return "prerelease";  }}