Omit missing baseline from generated issue titles

src/postGithubIssue.ts

@@ -3,6 +3,7 @@ import * as path from "node:path";
 import { artifactFolderUrlPlaceholder, getArtifactsApiUrlPlaceholder, type Metadata, metadataFileName, type RepoStatus, resultFileNameSuffix, type StatusCounts, type TsEntrypoint } from "./main.js";
 import * as git from "./utils/gitUtils.js";
 import * as pu from "./utils/packageUtils.js";
+import { formatVersionComparison } from "./utils/markdownUtils.js";
 
 const { argv } = process;
 
@@ -47,7 +48,7 @@ for (const path of metadataFilePaths) {
 }
 
 
-const title = `${entrypoint === "tsserver" || entrypoint === "fuzzer" ? `[ServerErrors][${language}]` : `[NewErrors]`} ${newTscResolvedVersion} vs ${oldTscResolvedVersion}`;
+const title = `${entrypoint === "tsserver" || entrypoint === "fuzzer" ? `[ServerErrors][${language}]` : `[NewErrors]`} ${formatVersionComparison(newTscResolvedVersion ?? "", oldTscResolvedVersion)}`;
 
 const description = entrypoint === "tsserver"
     ? `The following errors were reported by ${newTscResolvedVersion} vs ${oldTscResolvedVersion}`

src/utils/markdownUtils.ts

@@ -14,3 +14,7 @@ export function formatPrComparison(oldVersion: string | undefined, newVersion: s
     }
     return `${asMarkdownInlineCode(oldVersion ?? "old")} and ${asMarkdownInlineCode(newVersion ?? "new")}`;
 }
+
+export function formatVersionComparison(newVersion: string, oldVersion: string | undefined): string {
+    return oldVersion ? `${newVersion} vs ${oldVersion}` : newVersion;
+}

test/main.test.ts

@@ -2,7 +2,7 @@ import { detectTypeScriptImplementation, detectTypeScriptNpmImplementation, down
 import * as path from "node:path"
 import { execFileAsync } from '../src/utils/execUtils.js';
 import type { SpawnResult } from '../src/utils/execUtils.js';
-import { formatPrComparison } from '../src/utils/markdownUtils.js';
+import { formatPrComparison, formatVersionComparison } from '../src/utils/markdownUtils.js';
 import { describe, expect, it, vi } from "vitest";
 
 const testState = vi.hoisted(() => ({
@@ -116,6 +116,12 @@ describe("main", () => {
             .toBe("`792ffccb90f548cd3bdd7fc0b44f0ca9e1b169a7` and `refs/pull/64558/merge`");
     });
 
+    it("omits the comparison when there is no baseline version", () => {
+        expect(formatVersionComparison("main", undefined)).toBe("main");
+        expect(formatVersionComparison("main", "")).toBe("main");
+        expect(formatVersionComparison("7.0.0", "6.0.0")).toBe("7.0.0 vs 6.0.0");
+    });
+
     it("detects tsgo from the root package name", () => {
         expect(detectTypeScriptImplementation({ name: "typescript" })).toBe("strada");
         expect(detectTypeScriptImplementation({ name: "typescript-go" })).toBe("corsa");