Typings for Meteor 
1.2v: ambient Meteor typings, i.e., defines modules like Meteor, Mongo etc.
1.3v: contains ambient modules from 1.2v and defines based on them new Meteor 1.3 namespaces
like meteor/meteor, meteor/mongo etc.
Installation
typings install registry:env/meteor --global
typings is a major typings utility today, which can install and search typings across
multiple registers including DefinitelyTyped.
For example, if you want to install NodeJS typings, try: typings install registry:env/node --global.
To find out if there is any typings for a particular library or NPM, use typings search ....
For more information, please read here.
You could try also to copy&paste typings.json file located at the root of this repo to your app.
It is supposed to contain major typings Meteor depends on. After copying, execute typings install.
Atmosphere packages
If you want to install some Atmosphere package's typings, search for an appropriate repo in the current
meteor-typings organization, which is supposed to contain all available typings of such type.
If you have found that package's typings repo, go inside and read how to install typings. If not - you are very welcome to create new repo and contribute typings.
Development
In order to build all typings run gulp build.
1.2 and 1.3 share the same Meteor core packages' typings, which are located in 1.2/packages.
When you run gulp 1_3, typings are modified to contain modules corresponding new Meteor 1.3 namespaces.
Contribution
Please make sure that you change associated Meteor packages' typings directly in 1.2/packages and 1.3/packages folders.
main.d.ts and browser.d.ts are built out of them.