Function compareVersions

src/utils/updateCheck.ts:46–59

(a: string, b: string)

 * to lexicographic compare so "0.1.4-beta" sorts before "0.1.4".
 */
export function compareVersions(a: string, b: string): -1 | 0 | 1 {
  const [aMain, aPre] = splitVersion(a);
  const [bMain, bPre] = splitVersion(b);
  for (let i = 0; i < 3; i++) {
    const ai = aMain[i] ?? 0;
    const bi = bMain[i] ?? 0;
    if (ai !== bi) return ai < bi ? -1 : 1;
  }
  // A version with no pre-release is greater than one with one.
  if (aPre === bPre) return 0;
  if (aPre === "") return 1;
  if (bPre === "") return -1;
  return aPre < bPre ? -1 : 1;
}

function splitVersion(v: string): [number[], string] {
  const [main, pre = ""] = v.split("-", 2);