使用 Firebase Firestore withConverter() 时为什么会出现此 TypeScript 错误？

Question

我正在尝试将 Firebase Firestore

withConverter()

方法用于 JavaScript 版本 9 SDK。

我的代码改编自本教程。

基本思想是我们可以使用

withConverter()

为Firestore文档数据添加TypeScript类型。

我的代码和教程之间的主要区别是教程使用

import { firestore } from "firebase-admin"

和

firestore().collection()

来自安全环境的 Admin SDK。当我在前端使用

import { collection } from 'firebase/firestore';

达到相同的效果时。

我的问题是我的代码抛出 TypeScript 错误。

这是我的代码：

import { initializeApp } from 'firebase/app';
import { collection, getFirestore, PartialWithFieldValue, QueryDocumentSnapshot } from 'firebase/firestore';

// Firestore setup
const firebaseConfig = {
  ...
};
const firebaseApp = initializeApp(firebaseConfig);
const firestore = getFirestore(firebaseApp);

// Making the converter
const converter = <T>() => ({
  toFirestore: (data: PartialWithFieldValue<T>) => data,
  fromFirestore: (snap: QueryDocumentSnapshot) => snap.data() as T,
});

// This works without error, "userColRef" is correctly typed as "CollectionReference<User>"
const userColRef = collection(firestore, 'users').withConverter(converter<User>());

// This throws an error
const dataPoint = <T>(collectionPath: string) => {
  return collection(firestore, collectionPath).withConverter(converter<T>()); // <-- ERROR HERE
};

这是

converter<T>()

上的 TypeScript 错误：

No overload matches this call.   Overload 1 of 2, '(converter: null): CollectionReference<DocumentData>', gave the following error.
    Argument of type '{ toFirestore: (data: PartialWithFieldValue<T>) => PartialWithFieldValue<T>; fromFirestore: (snap: QueryDocumentSnapshot) => T; }' is not assignable to parameter of type 'null'.   Overload 2 of 2, '(converter: FirestoreDataConverter<T>): CollectionReference<T>', gave the following error.
    Argument of type '{ toFirestore: (data: PartialWithFieldValue<T>) => PartialWithFieldValue<T>; fromFirestore: (snap: QueryDocumentSnapshot) => T; }' is not assignable to parameter of type 'FirestoreDataConverter<T>'.
      The types returned by 'toFirestore(...)' are incompatible between these types.
        Type 'PartialWithFieldValue<T>' is not assignable to type 'DocumentData'.
          Type 'T extends Primitive ? T : T extends {} ? { [K in keyof T]?: FieldValue | PartialWithFieldValue<T[K]> | undefined; } : never' is not assignable to type 'DocumentData'.
            Type 'T | (T extends {} ? { [K in keyof T]?: FieldValue | PartialWithFieldValue<T[K]> | undefined; } : never)' is not assignable to type 'DocumentData'.
              Type 'Primitive & T' is not assignable to type 'DocumentData'.
                Type 'undefined & T' is not assignable to type 'DocumentData'.ts(2769)

关于

withConverter()

的更多细节可以在这里的官方文档中找到。