refactor: Format root-level files (#3858)

* ✨ Create `format.mjs` script

* 👕 Add lint exception

* ⚡ Add root formatting to `format` command

* 🎨 Fix glob in `.prettierignore`

* 🚚 Improve naming

* 🎨 Format root-level files

* ⚡ Simplify check

* ⚡ Add period to extension

* ⚡ Locate config

* ⚡ Add `ignore` arg

* 🚚 Move `config` and `ignore` after check

scripts/format.mjs

@@ -0,0 +1,46 @@
+#!/usr/bin/env node
+
+import fs from 'fs';
+import path from 'path';
+import { execSync } from 'child_process';
+
+const prettier = path.resolve('node_modules', 'prettier', 'bin-prettier.js');
+
+if (!fs.existsSync(prettier)) {
+	throw new Error(
+		[`Prettier not found at path: ${prettier}`, 'Please run `npm i` first'].join('\n'),
+	);
+}
+
+const config = path.resolve('.prettierrc.js');
+const ignore = path.resolve('.prettierignore');
+
+const ROOT_DIRS_TO_SKIP = ['.git', 'node_modules', 'packages'];
+const EXTENSIONS_TO_FORMAT = ['.md', '.yml', '.js', '.json'];
+
+const isDir = (path) => fs.lstatSync(path).isDirectory();
+
+const isTarget = (path) => EXTENSIONS_TO_FORMAT.some((ext) => path.endsWith(ext));
+
+const walk = (dir, test, found = []) => {
+	fs.readdirSync(dir).forEach((entry) => {
+		const entryPath = path.resolve(dir, entry);
+		if (isDir(entryPath)) walk(entryPath, test, found);
+		if (test(entryPath)) found.push(entryPath);
+	});
+
+	return found;
+};
+
+const targets = fs
+	.readdirSync('.')
+	.reduce((acc, cur) => {
+		if (ROOT_DIRS_TO_SKIP.includes(cur)) return acc;
+		if (isDir(cur)) return [...acc, ...walk(cur, isTarget)];
+		if (isTarget(cur)) return [...acc, cur];
+
+		return acc;
+	}, [])
+	.join(' ');
+
+execSync([prettier, '--config', config, '--ignore-path', ignore, '--write', targets].join(' '));