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);
  });

每次运行它我都会收到以下错误：

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

看着docs我真的不知道我做错了什么？

// 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等效工具似乎有效：admin.firestore.FieldValue.delete().但这似乎是一个bug,因为我在nodejs环境中？任何Firebaser都可以确认或拒绝这种情况吗？我很乐意提交错误报告.