build: refactored setup scripts to src/ .ts files (#469)

## PR Checklist

- [x] Addresses an existing open issue: fixes #468
- [x] That issue was marked as [`status: accepting
prs`](https://github.com/JoshuaKGoldberg/template-typescript-node-package/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/template-typescript-node-package/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

Applies two general refactors:

* Migrates `script/setup.js` contents to a `src/setup/` folder with
`.ts` files
* Moves out all the core logic (input parsing, repository fetching,
etc.) from that one file into other files

Author: JoshuaKGoldberg

.eslintrc.cjs

@@ -59,6 +59,14 @@ module.exports = {
 			rules: {
 				// These off-by-default rules work well for this repo and we like them on.
 				"deprecation/deprecation": "error",
+
+				// These more-strict-by-default rules don't work well for this repo and we like them less strict.
+				"@typescript-eslint/no-unnecessary-condition": [
+					"error",
+					{
+						allowConstantLoopConditions: true,
+					},
+				],
 			},
 		},
 		{
@@ -124,6 +132,7 @@ module.exports = {
 
 		// These on-by-default rules don't work well for this repo and we like them off.
 		"no-constant-condition": "off",
+		"no-case-declarations": "off",
 		"no-inner-declarations": "off",
 
 		// Stylistic concerns that don't interfere with Prettier

cspell.json

@@ -7,7 +7,7 @@
 		"lib",
 		"node_modules",
 		"pnpm-lock.yaml",
-		"script/*.json"
+		"src/setup/*.json"
 	],
 	"words": [
 		"Codecov",

knip.jsonc

@@ -3,8 +3,8 @@
 	"entry": [
 		"src/index.ts!",
 		"src/hydrate/index.ts",
-		"script/*e2e.js",
-		"script/setup*.js"
+		"src/setup/index.ts",
+		"script/*e2e.js"
 	],
 	"ignoreBinaries": ["dedupe", "gh"],
 	"project": ["src/**/*.ts!", "script/**/*.js"]

package.json

@@ -29,7 +29,7 @@
 		"lint:packages": "pnpm dedupe --check",
 		"lint:spelling": "cspell \"**\" \".github/**/*\"",
 		"prepare": "husky install",
-		"setup": "node script/setup.js",
+		"setup": "tsx src/setup/index.ts",
 		"setup:test": "node script/setup-test-e2e.js",
 		"should-semantic-release": "should-semantic-release --verbose",
 		"test": "vitest"
@@ -44,6 +44,7 @@
 	},
 	"devDependencies": {
 		"@clack/prompts": "^0.6.3",
+		"@octokit/request-error": "^3.0.3",
 		"@types/eslint": "^8.37.0",
 		"@types/js-yaml": "^4.0.5",
 		"@types/prettier": "^2.7.2",
@@ -85,6 +86,7 @@
 		"sentences-per-line": "^0.2.1",
 		"should-semantic-release": "^0.1.1",
 		"title-case": "^3.0.3",
+		"tsx": "^3.12.7",
 		"typescript": "^5.0.4",
 		"vitest": "^0.31.0",
 		"yaml-eslint-parser": "^1.2.2"