feat: better errors

src/services/gitService.ts

@@ -120,7 +120,22 @@ const updatePackageAndCommit = async(
 
   void logger.log("info", `Running pnpm install for ${packageName}...`);
   const pnpmPath = "/home/naomi/.local/share/pnpm/pnpm";
+  try {
     await execAsync(`${pnpmPath} install --no-frozen-lockfile`, { cwd: repoPath });
+  } catch (pnpmError: unknown) {
+    /* eslint-disable-next-line @typescript-eslint/consistent-type-assertions -- Catch blocks receive unknown, cast needed to access stderr/stdout */
+    const details = pnpmError as Error & { stderr?: string; stdout?: string };
+
+    /* eslint-disable capitalized-comments -- v8 coverage requires lowercase */
+    /* v8 ignore next 5 -- @preserve */
+    /* eslint-enable capitalized-comments -- Re-enable rule */
+    /* eslint-disable @typescript-eslint/strict-boolean-expressions, @typescript-eslint/prefer-nullish-coalescing -- Intentionally using || to treat empty strings as falsy */
+    const errorMessage = details.stderr || details.stdout || details.message;
+    /* eslint-enable @typescript-eslint/strict-boolean-expressions, @typescript-eslint/prefer-nullish-coalescing -- Re-enable rules */
+
+    void logger.log("info", `pnpm install failed: ${errorMessage}`);
+    throw pnpmError;
+  }
 
   await runGitCommand(logger, repoPath, "git add package.json pnpm-lock.yaml");
   const commitMessage = `deps: update ${packageName} to ${targetVersion}`;

test/services/gitService.spec.ts

@@ -363,4 +363,38 @@ describe("gitService", () => {
     expect(writtenContent.dependencies["test-package"]).toBe("2.0.0");
     expect(writtenContent.devDependencies["test-package"]).toBe("2.0.0");
   });
+
+  it("should log pnpm error details when install fails", async() => {
+    expect.assertions(2);
+    mockExecAsync.mockImplementation((command: string) => {
+      if (command.includes("pnpm install")) {
+        const error = new Error("pnpm failed") as Error & {
+          stderr: string;
+          stdout: string;
+        };
+        error.stderr = "ERR_PNPM_NO_MATCHING_VERSION";
+        error.stdout = "";
+        return Promise.reject(error);
+      }
+      return Promise.resolve({ stderr: "", stdout: "" });
+    });
+    vi.mocked(readFile).mockResolvedValue(JSON.stringify({
+      dependencies: { "test-package": "1.0.0" },
+    }));
+    vi.mocked(writeFile).mockResolvedValue(undefined);
+    const { createOrUpdateBranch } = await import("../../src/services/gitService.js");
+    const mockClonedRepo = createMockClonedRepo();
+    const result = await createOrUpdateBranch({
+      branchName:    "dependencies/update-test-package",
+      clonedRepo:    mockClonedRepo,
+      logger:        mockLogger,
+      packageName:   "test-package",
+      targetVersion: "2.0.0",
+    });
+    expect(result.status).toBe("failed");
+    expect(mockLogger.log).toHaveBeenCalledWith(
+      "info",
+      expect.stringContaining("ERR_PNPM_NO_MATCHING_VERSION"),
+    );
+  });
 });