Firebase 函数 onCall 在带有 firebase_functions_interop 的 Dart 中不起作用

Question

更新：我能够找到问题的根源 - 它似乎与 lodash 中的循环引用有关，这种引用在序列化响应时发生。 显然我需要返回一种特定类型的 promise，我还不知道该怎么做。

• Firebase 未处理的错误 RangeError：超出最大调用堆栈大小

• Firebase Function：未处理的错误 RangeError：超出最大调用堆栈大小

更新结束。

I am trying to get the official cloud function example from pub to work with dart using the package firebase_functions_interop which converts dart code to a deployable node based cloud function. 我按照本教程设置构建运行程序等（他们的示例对我有用）。

现在转到可调用函数，这就是这个问题的全部内容。

这是一个使用 JavaScript 的工作示例：

// JavaScript
const functions = require('firebase-functions');

exports.listFruit = functions.https.onCall(() => {
    return [
        "Apple",
        "Banana",
        "Cherry",
        "Date",
        "Fig",
        "Grapes"
    ];
});

这是我使用 dart 想到的：

// Dart
import 'package:firebase_functions_interop/firebase_functions_interop.dart';

void main() {
  functions['listFruit'] = functions.https.onCall((data, context) => listFruit);
}
FutureOr<List<String>> listFruit(dynamic data, CallableContext context) {
  return ['Apple', 'Banana', 'Cherry', 'Date', 'Fig', 'Grapes'];
}

但在执行时，我得到这个控制台 output 和 500 错误：

i  functions: Beginning execution of "listFruit"
>  Response cannot be encoded. Closure 'minified:ns' dh {
>    '$initialize': [Function: dh],
>    constructor: [Function: static_tear_off],
>    '$static_name': 'ns',
>    '$S': [Function (anonymous)],
>    '$2': [Function: ns] {
>      '$callName': '$2',
>      '$R': 2,
>      '$D': null,
>      '$stubName': 'ns',
>      '$tearOff': [Function (anonymous)]
>    },
>    '$C': [Function: ns] {
>      '$callName': '$2',
>      '$R': 2,
>      '$D': null,
>      '$stubName': 'ns',
>      '$tearOff': [Function (anonymous)]
>    },
>    '$R': 2,
>    '$D': null
>  }
>  {"severity":"ERROR","message":"Unhandled error Error: Invalid response, check logs for details\n    at Object.d (/test_dart_functions/functions/build/index.dart.js:183:3)\n    at h3.$2 (/test_dart_functions/functions/build/index.dart.js:4066:9)\n    at Object.m4 (/test_dart_functions/functions/build/index.dart.js:138:112)\n    at mE (/test_dart_functions/functions/build/index.dart.js:1872:10)\n    at /test_dart_functions/functions/build/index.dart.js:1866:42\n    at newHandler (/usr/local/Cellar/firebase-cli/9.1.0/libexec/lib/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:286:16)\n    at func (/test_dart_functions/functions/node_modules/firebase-functions/lib/providers/https.js:273:32)\n    at /test_dart_functions/functions/node_modules/firebase-functions/lib/providers/https.js:293:44\n    at cors (/test_dart_functions/functions/node_modules/cors/lib/index.js:188:7)\n    at /test_dart_functions/functions/node_modules/cors/lib/index.js:224:17 {\n  dartException: HttpsError: Invalid response, check logs for details\n      at Object.n9 (/test_dart_functions/functions/build/index.dart.js:1825:15)\n      at bD.aO (/test_dart_functions/functions/build/index.dart.js:4023:24)\n      at h3.$2 (/test_dart_functions/functions/build/index.dart.js:4066:13)\n      at Object.m4 (/test_dart_functions/functions/build/index.dart.js:138:112)\n      at mE (/test_dart_functions/functions/build/index.dart.js:1872:10)\n      at /test_dart_functions/functions/build/index.dart.js:1866:42\n      at newHandler (/usr/local/Cellar/firebase-cli/9.1.0/libexec/lib/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:286:16)\n      at func (/test_dart_functions/functions/node_modules/firebase-functions/lib/providers/https.js:273:32)\n      at /test_dart_functions/functions/node_modules/firebase-functions/lib/providers/https.js:293:44\n      at cors (/test_dart_functions/functions/node_modules/cors/lib/index.js:188:7) {\n    code: 'internal',\n    details: \"Closure 'minified:ns'\",\n    httpErrorCode: { canonicalName: 'INTERNAL', status: 500 }\n  }\n}"}
i  functions: Finished "listFruit" in ~1s

我真的很期待在 dart 中编写我所有的云功能——除了 onCall 其他似乎工作正常。

任何帮助将不胜感激！