javascript - 使用函数和Firestore时未定义FieldValue

我有以下功能:

const functions = require('firebase-functions');
const admin = require('firebase-admin');
const FieldValue = require('firebase-admin').FieldValue;

module.exports = functions.firestore
  .document('students/{studentId}')
  .onDelete(event => {
    const student = event.data.previous.data();
    const { id, semester } = student;
    const classId = student.class;
    const deleteObj = {};
    deleteObj[id] = FieldValue.delete(); //Line 12, this is where the error orccurs
    return admin
      .firestore()
      .collection('semesters')
      .doc(semester)
      .collection('students')
      .doc(classId)
      .update(deleteObj);
  });

每次我运行它时，都会出现以下错误:

TypeError: Cannot read property 'delete' of undefined
    at module.exports.functions.firestore.document.onDelete.event (/user_code/deleteStudent.js:12:37)

看着docs我真的看不到我在做什么错吗？

// Get the `FieldValue` object
var FieldValue = require("firebase-admin").FieldValue;

// Create a document reference
var cityRef = db.collection('cities').doc('BJ');

// Remove the 'capital' field from the document
var removeCapital = cityRef.update({
    capital: FieldValue.delete()
});

更新

因此，使用Web等效项似乎可行:admin.firestore.FieldValue.delete()。但这似乎是一个错误，因为我处于nodejs环境中？ Firebaser是否可以确认或拒绝这种情况？我很乐意提交错误报告。

最佳答案

原来这是文档中的错误，正确的导入应该是const FieldValue = require('firebase-admin').firestore.FieldValue;
更新

应该说Firebase在几个小时内做出了回应，并正在尽快更正文档。