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firebase.initializeApp() vs FirebaseApp.initializeApp()

I currently trying to set up push notifications using the Notifications package from 'expo-notifications', Im just getting the following error and I cant work around it:
[Error: Encountered an exception while calling native method: Exception occurred while executing exported method getDevicePushTokenAsync on module ExpoPushTokenManager: Default FirebaseApp is not initialized in this process com.-----.-----. Make sure to call FirebaseApp.initializeApp(Context) first.]
The thing is, this message is completely enraging me because I do call:
import * as firebase from "firebase";
and after that:
firebase.initializeApp(ApiKeys);
at the start of my app.
Do I now need to install the Firebase/App package so I can do FirebaseApp.initializeApp()? Do I need to initialize my app 2 times then?
Neither the docs from expo are mentioning such an error, nor I found anything related to this error in the firebase docs and Im really struggling with this one.

Aperently there is an import into the app/build.gradle file which is not mentioned inside the expo docs at all. Its the following line which is missing:
implementation("com.google.firebase:firebase-iid")
you need to put it inside your app/build.gradle file to make it work.
I found it in the following forum, the posts are just one month old so its a quite new bug.

How do I use require.js?

I have a folder that contains another folder and a file "server.js", the file is the node file and the folder contains HTML and client.js. server.js has a variable that holds the port for the website, and I want to access that variable to use it in the client.js, but it keeps erroring, I tried using import statement in the client.js but it gives "Uncaught SyntaxError: Cannot use import statement outside a module". I tried using require("server.js") but learned that client-side js doesn't support require() function. I searched and found that there's a library called RequireJS, while there are some tutorials to use it, they all use the same example and it always gives the same error no matter how much I changed the code, so please help me with a detailed tutorial on how to use RequireJS.

Reading a file for a npm package

I have created a npm package named test_package_cat, which is supposed to read a json file (info.json) at the beginning.
Thus, index.js (main entry) and info.json are at the same level.
When I run the index.js locally, I can read the file.
either:
fs.readFileSync('info.json')
or
fs.readFileSync(path.resolve(__dirname, 'info.json')
works fine.
However, when I have another program, a React page,that uses the package, it fails to read the json file.
cat = require('test_package_cat')
cat.meow()
When I run index.js locally, if I console.log(__dirname), it gives me C://......../myProject.
However, when running the React app, console.log(__dirname) just prints "/" and when I try to print directories/files, it shows nothing.
How can I make the my npm package to read info.json file?
Edit: After more searching, I managed to get it working by doing:
let info = require('./info.json')
console.log(JSON.stringify(info))
but would still like to know how to do it using "readFile" way.

fs is only available in the Node runtime environment. It isn't available in a browser's JavaScript runtime environment. I'm surprised you haven't encountered an error to that effect.

Why do dependency problems cause javascript code not to run properly when within a Meteor project?

I have been trying to port HTML5 with js code into Meteor. I'm having Javascript dependency problems.
The code can be found at: https://github.com/cwilso/Audio-Input-Effects
I created a new basically empty meteor project (which runs fine) and then added all of the js files from the repo above (which also runs fine on its own).
In order to make sure that the load order was correct, I renamed all the js files using numeric prefixes so that they would definitely be in the same order that they are loaded in the github repo. Looking forward to Meteor coming up with a better solution to this particular issue. I made a local copy of one js file that was otherwise loaded from a url in the repo.
In order to try to initialize the js I also added a file hello.js:
if (Meteor.isClient) {
Meteor.startup(function () {
// code to run on server at startup
initAudio;
});
}
When meteor runs and I look in the console, I get the following errors:
Uncaught TypeError: o3djs.provide is not a function (120_shader.js)
Uncaught ReferenceError: initAudio is not defined (hello.js)
Uncaught ReferenceError: Matrix4x4 is not defined (110_visualizer.js)
Thank you for your help.

I was able to resolve this issue by putting all of the js source files into a single js file in the correct order.

Anybody still wanting information regarding meteor load order, Scotch.io wrote an update to the official docs which clears it up somewhat.
https://github.com/meteor/meteor/commit/a5bdf481dfece9ebc57107d71be478f9b48cbd1e

NodeJS import error

I'm trying to use the resemblejs library (http://huddle.github.io/Resemble.js/) to compare two images. However, when I have created a directory and added resemblejs as a dependency, but when I try to run the following:
nodejs test.js, I get the following error
var api = resemble(fileData).onComplete(function(data){
^
ReferenceError: resemble is not defined
I've never used NodeJS before, so it might be something really simple. Any ideas?

You can't get directly node module instance from it. You can check this issue on its repo. node-resemble is an Node port of Resemble.js.
Hope it will be useful for you.