only-once

Prevent duplicate execution of Cloud Functions.
You should read this blog. firestore cloud functions onCreate/onDelete sometimes immediately triggered twice

Installation

npm install @star__hoshi/only-once --save
yarn add @star__hoshi/only-once

Usage

import * as OnlyOnce from '@star__hoshi/only-once'

OnlyOnce.initialize(admin.firestore())

export const updateUser = functions.firestore.document('user/{userId}').onCreate(async (change, context) => {
  const wasTriggered = await OnlyOnce.wasTriggered(context.eventId)
  if (wasTriggered) {
    console.log(`EventID: ${context.eventId} was already triggered!`)
    return undefined
  }

  // exec only once

  return undefined
})