chore: standardize ESM-first architecture and resolve all type/test/lint errors

.lintstagedrc.cjs

@@ -0,0 +1,11 @@
+/* eslint-disable no-undef */
+/* eslint-env node */
+const path = require('path');
+
+const buildEslintCommand = (filenames) =>
+  `eslint --fix ${filenames.map((f) => path.relative(process.cwd(), f)).join(' ')}`;
+
+module.exports = {
+  '*.{js,jsx,ts,tsx}': [buildEslintCommand, 'prettier --write'],
+  '*.{json,md,css,scss}': ['prettier --write'],
+};