refactor!: uses TypeScript, better API usage (#38)

eslint.config.mjs

@@ -0,0 +1,15 @@
+// @ts-check
+
+import eslint from "@eslint/js";
+import tseslint from "typescript-eslint";
+import prettierConfig from "eslint-plugin-prettier/recommended";
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  tseslint.configs.strict,
+  tseslint.configs.stylistic,
+  prettierConfig,
+  {
+    ignores: ["build"],
+  },
+);