chore: use create's applyFilesToSystem with create engine (#1762)

## PR Checklist

- [x] Addresses an existing open issue: fixes #1761
- [x] That issue was marked as [`status: accepting
prs`](https://github.com/JoshuaKGoldberg/create-typescript-app/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/create-typescript-app/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

Uses the (temporarily exported) `applyFilesToSystem` and
`createWritingFileSystem` APIs from `create`.

💖

package.json

@@ -45,7 +45,7 @@
 		"@prettier/sync": "^0.5.2",
 		"all-contributors-for-repository": "^0.3.0",
 		"chalk": "^5.3.0",
-		"create": "0.1.0-alpha.0",
+		"create": "0.1.0-alpha.1",
 		"execa": "^9.5.1",
 		"get-github-auth-token": "^0.1.0",
 		"git-remote-origin-url": "^4.0.0",
@@ -80,7 +80,7 @@
 		"@vitest/eslint-plugin": "1.1.14",
 		"c8": "10.1.2",
 		"console-fail-test": "0.5.0",
-		"create-testers": "0.1.0-alpha.0",
+		"create-testers": "0.1.0-alpha.1",
 		"cspell": "8.16.1",
 		"eslint": "9.16.0",
 		"eslint-plugin-jsdoc": "50.6.0",

src/next/blocks/blockPrettier.ts

@@ -89,7 +89,7 @@ pnpm format --write
 			files: {
 				".husky": {
 					".gitignore": "_",
-					"pre-commit": "npx lint-staged",
+					"pre-commit": ["npx lint-staged", { mode: 0x777 }],
 				},
 				".prettierignore": ["/.husky", "/lib", "/pnpm-lock.yaml", ...ignores]
 					.sort()

src/steps/writing/creation/index.ts

@@ -51,13 +51,12 @@ async function recursivelyFormat(files: CreatedFiles): Promise<Structure> {
 	const result: Structure = {};
 
 	for (const [key, value] of Object.entries(files)) {
-		switch (typeof value) {
-			case "object":
-				result[key] = await recursivelyFormat(value);
-				break;
-			case "string":
-				result[key] = await formatCreatedFile(key, value);
-				break;
+		if (Array.isArray(value)) {
+			result[key] = await formatCreatedFile(key, value[0]);
+		} else if (typeof value === "string") {
+			result[key] = await formatCreatedFile(key, value);
+		} else if (typeof value === "object") {
+			result[key] = await recursivelyFormat(value);
 		}
 	}
 

src/steps/writing/writeStructure.ts

@@ -1,3 +1,4 @@
+import { applyFilesToSystem, createWritingFileSystem } from "create";
 import { $ } from "execa";
 
 import { isUsingCreateEngine } from "../../shared/isUsingCreateEngine.js";
@@ -6,10 +7,15 @@ import { createStructure } from "./creation/index.js";
 import { writeStructureWorker } from "./writeStructureWorker.js";
 
 export async function writeStructure(options: Options) {
-	await writeStructureWorker(
-		await createStructure(options, isUsingCreateEngine()),
-		".",
-	);
+	const usingCreateEngine = isUsingCreateEngine();
+	const structure = await createStructure(options, usingCreateEngine);
+
+	if (usingCreateEngine) {
+		await applyFilesToSystem(structure, createWritingFileSystem(), ".");
+		return;
+	}
+
+	await writeStructureWorker(structure, ".");
 
 	try {
 		// https://github.com/JoshuaKGoldberg/create-typescript-app/issues/718