vscode调试时，项目语法报错
在使用vscode对koa server部分进行调试时，启动报错，
```
SyntaxError: Unexpected token function
/Users/xiongsheng/personal_project/Github/vue-koa-demo/node_modules/koa-jwt/lib/index.js:17
    const middleware = async function jwt(ctx, next) {
                             ^^^^^^^^
SyntaxError: Unexpected token function
```

我的launch.json配置如下
```
{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "launch",
            "name": "Launch Program",
            "program": "${workspaceFolder}/server-entry.js",
            "sourceMaps": true,
            "runtimeExecutable": null,
            "runtimeArgs": [
            ],
            "outFiles": []
        }
    ]
}
```
想知道launch.json该如何配置