build(frontend): convert to ESM

- add `type: module`.
- replace `require` and `module.exports` with `import` and `export default` in config files.

frontend/.prettierrc.js

@@ -1,4 +1,4 @@
-module.exports = {
+export default {
   semi: true,
   trailingComma: 'all',
   singleQuote: true,

frontend/eslint.config.js

@@ -1,11 +1,11 @@
-const js = require('@eslint/js');
-const prettier = require('eslint-config-prettier');
-const reactRecommended = require('eslint-plugin-react/configs/recommended');
-const reactJSXRuntime = require('eslint-plugin-react/configs/jsx-runtime');
-const reactHooks = require('eslint-plugin-react-hooks');
-const typescript = require('typescript-eslint').default;
+import js from '@eslint/js';
+import prettier from 'eslint-config-prettier';
+import reactRecommended from 'eslint-plugin-react/configs/recommended.js';
+import reactJSXRuntime from 'eslint-plugin-react/configs/jsx-runtime.js';
+import reactHooks from 'eslint-plugin-react-hooks';
+import typescript from 'typescript-eslint';
 
-module.exports = [
+export default [
   js.configs.recommended,
   reactRecommended,
   reactJSXRuntime,

frontend/package.json

@@ -2,6 +2,7 @@
   "name": "infra-risk-vis",
   "version": "0.2.0",
   "private": true,
+  "type": "module",
   "dependencies": {
     "@emotion/react": "^11.7.1",
     "@emotion/styled": "^11.6.0",