fix: prefer prerelease tags when determining latest

.gitignore

@@ -215,4 +215,7 @@ GitHub.sublime-settings
 .history
 
 # End of https://www.gitignore.io/api/node,intellij,sublimetext,visualstudiocode
+
+### Files generated from testing ###
+packages/cli/auto
 docs/public/search-index.json

packages/core/src/__tests__/git.test.ts

@@ -167,6 +167,31 @@ describe("github", () => {
       );
     });
 
+    test("will prefer latest tags from prerelease branch if available", async () => {
+      const gh = new Git(options);
+
+      gh.getTags = (ref: string) => {
+        if (ref === "origin/main") {
+          return Promise.resolve(["1.0.0", "1.2.3", "1.4.0"]);
+        }
+
+        return Promise.resolve([
+          "1.0.0",
+          "1.2.3",
+          "1.4.0",
+          "1.4.1-beta.0",
+          "1.4.1-beta.1",
+          "1.4.1-beta.2",
+          "1.4.1-alpha.0",
+          "1.4.1-alpha.1",
+        ]);
+      };
+
+      expect(await gh.getTagNotInBaseBranch("alpha")).toBe("1.4.1-alpha.1");
+
+      expect(await gh.getTagNotInBaseBranch("beta")).toBe("1.4.1-beta.2");
+    });
+
     test("handles tags with package names", async () => {
       const baseTags = ["@monorepo/models@2.0.0", "@monorepo/core@2.0.0"];
       const branchTags = [

packages/core/src/git.ts

@@ -904,7 +904,15 @@ export default class Git {
     const baseTags = (
       await this.getTags(`origin/${this.options.baseBranch}`)
     ).reverse();
-    const branchTags = (await this.getTags(`heads/${branch}`)).reverse();
+    let branchTags = (await this.getTags(`heads/${branch}`)).reverse();
+    const branchTagsWithPrereleaseSuffix = branchTags.filter(
+      (tag) => tag.indexOf(`-${branch.toLowerCase()}`) >= 0
+    );
+
+    if (branchTagsWithPrereleaseSuffix.length) {
+      branchTags = branchTagsWithPrereleaseSuffix;
+    }
+
     const comparator = options.first ? lt : gt;
     let firstGreatestUnique: string | undefined;