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Angular: Where to put reusable configuration

Just getting started with Angular:
I'd like to create a shared configuration singleton containing, eg the baseURL for service endpoints.
What is the pattern for this in Angular?

I recommend to use something like a constant https://docs.angularjs.org/api/ng/type/angular.Module#constant. This can be injected into any part of your app, even during the config phase.

Module.exports in meteor

I want to use oauth2-server in my meteor project which is an api provider implemented using restivus. In documentation for oauth2-server they specify to require the model in configuration which obviously need to export the model js file. How to use module.export in meteor so that I can export my model

Hapi.js Documentation generator for REST API Servers

I was looking for a tool that generates static documentation for Hapi.js routes, but doesn't create dependencies to the API server.
So I was just visualising a cli tool where I could pass my server.js as an argument, and would create the API documentation by parsing my route definitions.
hapi-swagger modules fails, as it creates the follwoing dependencies to my server;
Have to define a view engine
Have to disable the minimal option of my api servers
Have to define a /documentation route (I know I can change that, but the issue persists)
If such tool doesn't exists, what is the best alternative to create swagger ui static files documentation?
Thanks!

First the lout module is officially supported by hapijs and is not deprecated. It provides an alternative to swagger. But it does not solve your problem because it does not generate static html/css.
Now to the solution: I would add hapi-swagger but only in development like this (so you keep your server lightweight in staging/production)...
...
if (process.env.NODE_ENV === 'development') {
//Register inert, vision, hapi-swagger with server.register()
}
...
...then use bootprint-swagger or something similar to generate static html which you can serve on a web server of your choice.
Hope this helps.

EmberJs ember-data with ember-localstorage-adapter

Im using REST adapter by ember-data and it works fine. But now I want to use local storage for user settings storing.
Please, explain me, what is the right way?
I'm using ember-cli.

All you need to do is create a file in the adapters folder, with the same name of your model
//app/adapters/settings.js
import LSAdapter from "your_adapter"
export default LSAdapter.extend();
For local storage you can use Local Forage Adapter

Express js require() followed by funtion(app)

Im fairly new to Nodejs and express, I was looking through some tutorials and examples and stumbled across
this inside app.js
var router = require('./router')(app);
What is the purpose of doing this?
This is whats inside the router file
module.exports = function (app) {
// The signup route
app.use('/signup', require('./routes/signup'));
}

You import your routers from another file.
This is a technique for scaffolding. Models, views, controllers and routers are kept in different files and then you import them into a main.js with require().
You create your project modular, it's more easy to scale and develop with team.

This is a popular modular pattern in javascript, often seen in node. Here's what you gain:
You can modularize your code into separate files so you don't end up with big monolith chunks of code.
By requiring the module as a function, you can pass some variable constants (such as the application config, or a datatbase entry point).
You can choose what to expose, and what to keep private by using module.exports which cleans up the global object for the application.
In the code snippet you provided, your passing the app config to the routes file, where you are creating a route that is reliant on the variable. If that route relied on interior logic, that logic could be scoped to the routes.js file rather than be exposed to the rest of the application.