fix linting issues

Author: mathu97

packages/@apphosting/adapter-nextjs/e2e/run-local.ts

@@ -68,7 +68,7 @@ const scenarios: Scenario[] = [
 
         // skip creating the test config if data is not provided
         if (!scenario.config || !scenario.file) {
-          return
+          return;
         }
 
         const configContent = scenario.config;

packages/@apphosting/adapter-nextjs/src/bin/build.ts

@@ -5,7 +5,6 @@ import {
   generateBuildOutput,
   validateOutputDirectory,
   getAdapterMetadata,
-  exists,
 } from "../utils.js";
 import { join } from "path";
 import { getBuildOptions, runBuild } from "@apphosting/common";

packages/@apphosting/adapter-nextjs/src/overrides.spec.ts

@@ -340,18 +340,12 @@ describe("validateNextConfigOverride", () => {
   let root: string;
   let projectRoot: string;
   let originalConfigFileName: string;
-  let newConfigFileName: string;
-  let originalConfigPath: string;
-  let newConfigPath: string;
 
   beforeEach(() => {
     tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "test-next-config-override"));
     root = tmpDir;
     projectRoot = tmpDir;
     originalConfigFileName = "next.config.js";
-    newConfigFileName = "next.config.original.js";
-    originalConfigPath = path.join(root, originalConfigFileName);
-    newConfigPath = path.join(root, newConfigFileName);
 
     fs.mkdirSync(root, { recursive: true });
   });