feat: switch from tseslint.config to ESLint's defineConfig (#2286)

## PR Checklist

- [x] Addresses an existing open issue: fixes #2272
- [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

Applies the swap in-place.

🎁

Author: JoshuaKGoldberg

eslint.config.js

@@ -19,9 +19,10 @@ import packageJson from "eslint-plugin-package-json";
 import perfectionist from "eslint-plugin-perfectionist";
 import * as regexp from "eslint-plugin-regexp";
 import yml from "eslint-plugin-yml";
+import { defineConfig } from "eslint/config";
 import tseslint from "typescript-eslint";
 
-export default tseslint.config(
+export default defineConfig(
 	{
 		ignores: ["**/*.snap", "coverage", "lib", "node_modules", "pnpm-lock.yaml"],
 	},

src/blocks/blockESLint.test.ts

@@ -114,9 +114,10 @@ describe("blockESLint", () => {
 			  ],
 			  "files": {
 			    "eslint.config.js": "import eslint from "@eslint/js";
+			import { defineConfig } from "eslint/config";
 			import tseslint from "typescript-eslint";
 
-			export default tseslint.config(
+			export default defineConfig(
 				{ ignores: ["lib", "node_modules", "pnpm-lock.yaml"] },
 				{ linterOptions: {"reportUnusedDisableDirectives":"error"} },
 				eslint.configs.recommended,
@@ -268,9 +269,10 @@ describe("blockESLint", () => {
 			  ],
 			  "files": {
 			    "eslint.config.js": "import eslint from "@eslint/js";
+			import { defineConfig } from "eslint/config";
 			import tseslint from "typescript-eslint";
 
-			export default tseslint.config(
+			export default defineConfig(
 				{ ignores: ["lib", "node_modules", "pnpm-lock.yaml"] },
 				{ linterOptions: {"reportUnusedDisableDirectives":"error"} },
 				eslint.configs.recommended,
@@ -425,9 +427,10 @@ describe("blockESLint", () => {
 			  ],
 			  "files": {
 			    "eslint.config.mjs": "import eslint from "@eslint/js";
+			import { defineConfig } from "eslint/config";
 			import tseslint from "typescript-eslint";
 
-			export default tseslint.config(
+			export default defineConfig(
 				{ ignores: ["lib", "node_modules", "pnpm-lock.yaml"] },
 				{ linterOptions: {"reportUnusedDisableDirectives":"error"} },
 				eslint.configs.recommended,
@@ -604,9 +607,10 @@ describe("blockESLint", () => {
 			import a from "eslint-plugin-markdown"
 			import b from "eslint-plugin-regexp"
 			import c from "eslint-plugin-unknown"
+			import { defineConfig } from "eslint/config";
 			import tseslint from "typescript-eslint";
 
-			export default tseslint.config(
+			export default defineConfig(
 				{ ignores: ["generated", "lib", "node_modules", "pnpm-lock.yaml"] },
 				{ linterOptions: {"reportUnusedDisableDirectives":"error"} },
 				eslint.configs.recommended,
@@ -740,9 +744,10 @@ describe("blockESLint", () => {
 			  ],
 			  "files": {
 			    "eslint.config.js": "import eslint from "@eslint/js";
+			import { defineConfig } from "eslint/config";
 			import tseslint from "typescript-eslint";
 
-			export default tseslint.config(
+			export default defineConfig(
 				{ ignores: ["lib", "node_modules", "pnpm-lock.yaml"] },
 				{ linterOptions: {"reportUnusedDisableDirectives":"error"} },
 				eslint.configs.recommended,
@@ -882,9 +887,10 @@ describe("blockESLint", () => {
 			  ],
 			  "files": {
 			    "eslint.config.js": "import eslint from "@eslint/js";
+			import { defineConfig } from "eslint/config";
 			import tseslint from "typescript-eslint";
 
-			export default tseslint.config(
+			export default defineConfig(
 				{ ignores: ["lib", "node_modules", "pnpm-lock.yaml"] },
 				{ linterOptions: {"reportUnusedDisableDirectives":"error"} },
 				eslint.configs.recommended,
@@ -1020,9 +1026,10 @@ describe("blockESLint", () => {
 			  ],
 			  "files": {
 			    "eslint.config.js": "import eslint from "@eslint/js";
+			import { defineConfig } from "eslint/config";
 			import tseslint from "typescript-eslint";
 
-			export default tseslint.config(
+			export default defineConfig(
 				{ ignores: ["lib", "node_modules", "pnpm-lock.yaml"] },
 				{ linterOptions: {"reportUnusedDisableDirectives":"error"} },
 				eslint.configs.recommended,
@@ -1146,9 +1153,10 @@ describe("blockESLint", () => {
 			  ],
 			  "files": {
 			    "eslint.config.js": "import eslint from "@eslint/js";
+			import { defineConfig } from "eslint/config";
 			import tseslint from "typescript-eslint";
 
-			export default tseslint.config(
+			export default defineConfig(
 				{ ignores: ["lib", "node_modules", "pnpm-lock.yaml"] },
 				{ linterOptions: {"reportUnusedDisableDirectives":"error"} },
 				eslint.configs.recommended,
@@ -1269,9 +1277,10 @@ describe("blockESLint", () => {
 			  ],
 			  "files": {
 			    "eslint.config.mjs": "import eslint from "@eslint/js";
+			import { defineConfig } from "eslint/config";
 			import tseslint from "typescript-eslint";
 
-			export default tseslint.config(
+			export default defineConfig(
 				{ ignores: ["lib", "node_modules", "pnpm-lock.yaml"] },
 				{ linterOptions: {"reportUnusedDisableDirectives":"error"} },
 				eslint.configs.recommended,
@@ -1392,9 +1401,10 @@ describe("blockESLint", () => {
 			  ],
 			  "files": {
 			    "eslint.config.js": "import eslint from "@eslint/js";
+			import { defineConfig } from "eslint/config";
 			import tseslint from "typescript-eslint";
 
-			export default tseslint.config(
+			export default defineConfig(
 				{ ignores: ["lib", "node_modules", "pnpm-lock.yaml"] },
 				{ linterOptions: {"reportUnusedDisableDirectives":"error"} },
 				eslint.configs.recommended,

src/blocks/blockESLint.ts

@@ -62,6 +62,7 @@ export const blockESLint = base.createBlock({
 
 		const importLines = [
 			'import eslint from "@eslint/js";',
+			'import { defineConfig } from "eslint/config";',
 			'import tseslint from "typescript-eslint";',
 			...imports.map(
 				(packageImport) =>
@@ -221,7 +222,7 @@ Each should be shown in VS Code, and can be run manually on the command-line:
 			files: {
 				[configFileName]: `${explanation}${importLines.join("\n")}
 
-export default tseslint.config(
+export default defineConfig(
 	{ ignores: [${ignoreLines.join(", ")}] },
 	${printExtension({
 		linterOptions: { reportUnusedDisableDirectives: "error" },