fix(esbuild): transpile with esnext in dev (#10207)

Author: bluwy

Diff for: packages/plugin-vue/src/main.ts

@@ -221,7 +221,11 @@ export async function transformMain(
     const { code, map } = await transformWithEsbuild(
       resolvedCode,
       filename,
-      { loader: 'ts', sourcemap: options.sourceMap },
+      {
+        loader: 'ts',
+        target: 'esnext',
+        sourcemap: options.sourceMap
+      },
       resolvedMap
     )
     resolvedCode = code

Diff for: playground/vue/tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "compilerOptions": {
+    // esbuild transpile should ignore this
+    "target": "ES5"
+  },
+  "include": ["src"]
+}