我有一个简单的lambda（在一个cognito authorizer后面）和一个http事件，我使用httpJsonParser来解析主体，然后我使用一个定制的中间件来验证使用zod的json，最后但同样重要的是我使用httpErrorHandler中间件。

const customhandler = async (event: APIGatewayProxyEvent): Promise<APIGatewayProxyResult> => {
  return { 
    statusCode: 200,
    body: `success
    available claims  : ${JSON.stringify(event.requestContext.authorizer?.claims)}`
  };
};

export const handler = middy(customhandler)
  .use(httpJsonBodyParser())
  .use(customValidator(SOMESCHEMA))
  .use(httpErrorHandler());

customValidator如下所示：

export const customValidator = (schema: ZodSchema): middy.MiddlewareObj<APIGatewayProxyEvent, APIGatewayProxyResult> => {
  const before: middy.MiddlewareFn<APIGatewayProxyEvent, APIGatewayProxyResult> = async (
    request
  ): Promise<void> => {
    if (request.event.body != null) {
      try {
        schema.parse(request.event.body);
      } catch (e) {
        throw new Error("Validation error");
      }
    }
  };

  return {
    before
  };
};

当我删除.use(httpJsonBodyParser())和.use(httpErroHandler())时，执行customValidation，并且没有语法错误。
然而，只要我添加了一个（或两个）中间件，不管有没有我的定制中间件，在执行lambda时我都会收到以下错误：

"Runtime.UserCodeSyntaxError: SyntaxError: Unexpected token '??='",
        "    at _loadUserApp (/var/runtime/UserFunction.js:222:13)",
        "    at Object.module.exports.load (/var/runtime/UserFunction.js:300:17)",
        "    at Object.<anonymous> (/var/runtime/index.js:43:34)",
        "    at Module._compile (internal/modules/cjs/loader.js:1085:14)",
        "    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)",
        "    at Module.load (internal/modules/cjs/loader.js:950:32)",
        "    at Function.Module._load (internal/modules/cjs/loader.js:790:12)",
        "    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:75:12)",
        "    at internal/main/run_main_module.js:17:47"

我的IDE和eslint并没有抱怨...
正如建议的那样，构建过程可能存在问题，下面是我的tsconfig文件：

{
  "extends": "@tsconfig/node14/tsconfig.json",
  "compilerOptions": {
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "sourceMap": true,
    "outDir": "dist",
    "baseUrl": ".",
    "paths": {
      "core/*": [
        "../core/src/*"
      ],
      "schema/*": [
        "../schema/src/*"
      ]
    }
  }
}

没什么特别的。