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9 changes: 8 additions & 1 deletion index.js
Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,14 @@ if (process.argv.length > 2) {
if (appVersionDiff !== null) {
// get helm version and apply the app version diff
const prevHelmVersion = helmChart.get("version");
const newHelmVersion = semver.inc(prevHelmVersion, appVersionDiff);

// carry over the prerelease identifier (e.g. "beta") so an appVersion
// like 4.2.1-beta.2 doesn't collapse to a numeric-only 4.2.1-2
const prerelease = semver.prerelease(newAppVersion);
const identifier =
prerelease && typeof prerelease[0] === "string" ? prerelease[0] : undefined;

const newHelmVersion = semver.inc(prevHelmVersion, appVersionDiff, identifier);

// apply the new versions
helmChart.set("version", newHelmVersion);
Expand Down