Remove tsdx & update testing setup

.changeset/config.json

@@ -1,9 +1,9 @@
 {
-  "$schema": "https://unpkg.com/@changesets/config@1.3.0/schema.json",
+  "$schema": "https://unpkg.com/@changesets/config@latest/schema.json",
   "access": "public",
   "baseBranch": "main",
   "changelog": [
-    "@changesets/changelog-github",
+    "@zazen/changesets-changelog",
     { "repo": "stormwarning/tailwindcss-capsize" }
   ],
   "commit": false,

.eslintrc.cjs

@@ -0,0 +1,41 @@
+/** @type {import('eslint').Linter.Config} */
+const config = {
+	extends: [
+		'@zazen',
+		'@zazen/eslint-config/node',
+		'@zazen/eslint-config/typescript',
+	],
+	env: {
+		node: true,
+	},
+	rules: {
+		/**
+		 * @todo [@zazen/eslint-config@>6.7.0] Remove this rule when it's included in the base config.
+		 */
+		'unicorn/switch-case-braces': ['error', 'avoid'],
+	},
+	overrides: [
+		{
+			// Jest config
+			files: [
+				'**/__tests__/**/*.{js,ts,tsx}',
+				'**/*.@(spec|test).{js,ts,tsx}',
+			],
+			env: {
+				jest: true,
+			},
+			rules: {
+				'import/no-extraneous-dependencies': 'off',
+			},
+		},
+		{
+			files: ['**/*.d.ts'],
+			rules: {
+				// Prevent conflicts with `import/no-mutable-exports`.
+				'prefer-let/prefer-let': 'off',
+			},
+		},
+	],
+}
+
+module.exports = config