test: update configtest to use flat config

configtest/classic/run.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+cd $(dirname "$0")
+set -eux
+eslint --max-warnings 0 src

configtest/classic/src/index.tsx

@@ -0,0 +1,18 @@
+export async function foo(): Promise<number> {
+  const x = await Promise.resolve(42);
+  return x;
+}
+
+// eslint-disable-next-line @typescript-eslint/no-floating-promises
+foo();
+foo().catch((err) => {
+  const msg = err.toString();
+  // eslint-disable-next-line no-console
+  console.error(msg);
+});
+
+import React from 'react';
+
+export const Foo: React.FC = () => {
+  return <h1>Hello</h1>;
+};

configtest/classic/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "compilerOptions": {
+    "strict": true,
+    "lib": ["esnext", "dom"],
+    "esModuleInterop": true,
+    "jsx": "react"
+  },
+  "include": ["src/**/*"]
+}

configtest/javascript/eslint.config.js

@@ -0,0 +1,10 @@
+import config from '@hatena/eslint-config-hatena/flat';
+import globals from 'globals';
+
+export default config({}, [
+  {
+    languageOptions: {
+      globals: { ...globals.node },
+    },
+  },
+]);

configtest/typescript-react/eslint.config.js

@@ -0,0 +1,10 @@
+import config from '@hatena/eslint-config-hatena/flat';
+import globals from 'globals';
+
+export default config({ react: true }, [
+  {
+    languageOptions: {
+      globals: { ...globals.node },
+    },
+  },
+]);

configtest/typescript/eslint.config.js

@@ -0,0 +1,10 @@
+import config from '@hatena/eslint-config-hatena/flat';
+import globals from 'globals';
+
+export default config({}, [
+  {
+    languageOptions: {
+      globals: { ...globals.node },
+    },
+  },
+]);

package.json

@@ -44,6 +44,7 @@
     "configtest:javascript": "./configtest/javascript/run.sh",
     "configtest:typescript": "./configtest/typescript/run.sh",
     "configtest:typescript-react": "./configtest/typescript-react/run.sh",
+    "configtest:classic": "./configtest/classic/run.sh",
     "prepublishOnly": "run-s format:check lint:check typecheck build configtest"
   },
   "dependencies": {