[2021] Who builds paid web services these days? Everything about Firebase - Javascript

Hello, I am developer David.

As Firebase was recently upgraded to version 9 series, the grammar has changed compared to the previous version 8 and below.

This lecture is composed of versions 8 and below.

If you accidentally install the latest version of firebase while using npm firebase,

I think you will have a hard time understanding it because the lecture content and grammar do not match at all.

If you ever need to install the firebase module,

For version 8, you only need to install up to the last version, npm install --save firebase@8.10.0.

If you are taking the lecture using only the source code provided as an example, you don't need to worry about the existing source package, as it is not version 9.