fix(update-files): tsconfig needed to be deep merged

I tried the existing utility (@typescript-eslint/utils) for merging, but that balloned the cli.js to
110k lines, so I chose to use lodash for the merge, as it was already a peer dependency. I am sorry
if there was another merging utility already in place, I didn't find it :(

fix #6058

package.json

@@ -72,6 +72,7 @@
     "@types/cross-spawn": "^6.0.6",
     "@types/eslint": "^8.56.6",
     "@types/express": "^4.17.21",
+    "@types/lodash": "^4.17.0",
     "@types/node": "^20.11.30",
     "@types/path-browserify": "^1.0.2",
     "@types/prompts": "^2.4.9",
@@ -97,6 +98,7 @@
     "execa": "8.0.1",
     "express": "4.18.3",
     "install": "^0.13.0",
+    "lodash": "^4.17.21",
     "monaco-editor": "^0.45.0",
     "mri": "1.2.0",
     "path-browserify": "1.0.1",

packages/qwik/src/cli/add/update-files.ts

@@ -2,6 +2,7 @@ import fs from 'node:fs';
 import type { FsUpdates, UpdateAppOptions } from '../types';
 import { extname, join } from 'node:path';
 import { getPackageManager } from '../utils/utils';
+import mergeWith from 'lodash/mergeWith';
 
 export async function mergeIntegrationDir(
   fileUpdates: FsUpdates,
@@ -23,7 +24,7 @@ export async function mergeIntegrationDir(
       } else if (s.isFile()) {
         if (destName === 'package.json') {
           await mergePackageJsons(fileUpdates, srcChildPath, destChildPath);
-        } else if (destName === 'settings.json') {
+        } else if (destName === 'settings.json' || destName === 'tsconfig.json') {
           await mergeJsons(fileUpdates, srcChildPath, destChildPath);
         } else if (destName === 'README.md') {
           await mergeReadmes(fileUpdates, srcChildPath, destChildPath);
@@ -86,11 +87,15 @@ async function mergeJsons(fileUpdates: FsUpdates, srcPath: string, destPath: str
   try {
     const srcPkgJson = JSON.parse(srcContent);
     const destPkgJson = JSON.parse(await fs.promises.readFile(destPath, 'utf-8'));
-    Object.assign(srcPkgJson, destPkgJson);
+    const mergedJson = mergeWith(srcPkgJson, destPkgJson, (value, srcValue) => {
+      if (Array.isArray(value)) {
+        return value.concat(srcValue);
+      }
+    });
 
     fileUpdates.files.push({
       path: destPath,
-      content: JSON.stringify(srcPkgJson, null, 2) + '\n',
+      content: JSON.stringify(mergedJson, null, 2) + '\n',
       type: 'modify',
     });
   } catch (e) {