ci: shard package upgrade survivor baselines

scripts/resolve-upgrade-survivor-baselines.mjs

@@ -128,6 +128,19 @@ export function resolveReleaseHistory(args) {
   return dedupeSpecs(versions);
 }
 
+export function resolveLastStable(args, count) {
+  const releasesJson = args.get("releases-json");
+  if (!releasesJson) {
+    throw new Error("--releases-json is required when requested baselines include last-stable-*");
+  }
+  if (!Number.isInteger(count) || count < 1) {
+    throw new Error(`invalid last-stable baseline count: ${count}`);
+  }
+  const publishedVersions = readPublishedVersions(args.get("npm-versions-json"));
+  const releases = readStableReleases(releasesJson, publishedVersions);
+  return dedupeSpecs(releases.slice(0, count).map((release) => release.version));
+}
+
 export function resolveAllSince(args, minimumVersion) {
   const releasesJson = args.get("releases-json");
   if (!releasesJson) {
@@ -149,11 +162,13 @@ export function resolveBaselines(args) {
   if (requestedTokens.length === 0) {
     return dedupeSpecs([fallback]);
   }
-  const exactTokens = [];
   const resolved = [];
   for (const token of requestedTokens) {
     if (token === "release-history") {
       resolved.push(...resolveReleaseHistory(args));
+    } else if (token.startsWith("last-stable-")) {
+      const count = Number.parseInt(token.slice("last-stable-".length), 10);
+      resolved.push(...resolveLastStable(args, count));
     } else if (token.startsWith("all-since-")) {
       const minimumVersion = token.slice("all-since-".length);
       if (!parseStableVersion(minimumVersion)) {
@@ -161,10 +176,10 @@ export function resolveBaselines(args) {
       }
       resolved.push(...resolveAllSince(args, minimumVersion));
     } else {
-      exactTokens.push(token);
+      resolved.push(token);
     }
   }
-  return dedupeSpecs([...exactTokens, ...resolved]);
+  return dedupeSpecs(resolved);
 }
 
 const isMain = process.argv[1] ? fileURLToPath(import.meta.url) === process.argv[1] : false;