Chore: vite.config.jsのtargetをtsconfig.jsonに合わせる (#496)

* Updated `vite.config.js`
  so that it matches the `tsconfig.json`

* Let `vite.config.js` sync with `tsconfig.json`

playground/vite.config.js

@@ -1,5 +1,10 @@
 import { defineConfig } from 'vite'
 import vue from '@vitejs/plugin-vue'
+import { readFileSync } from 'fs';
+
+const data = JSON.parse(readFileSync('../tsconfig.json', 'utf8'));
+
+let target = data.compilerOptions.target;
 
 // https://vitejs.dev/config/
 export default defineConfig({
@@ -10,4 +15,7 @@ export default defineConfig({
 			allow: [ '..' ]
 		}
 	},
+	build: {
+		target: target
+	},
 })