Meteor 1.2.x to 1.4.x Migration Guide

Official Meteor Migration Guide

1. update to Meteor 1.3.5.1
   meteor update --release 1.3.5.1
2. check app running on Meteor 1.3.5.1
3. update to Meteor 1.4.x
   meteor update
meteor update --all-packages
4. initialise npm
   meteor npm init
5. replace old npm-container
Remove packages from your app: meteor remove meteorhacks:npm npm-container
   Remove the generated npm-container package: rm -r packages/npm-container
   Move the contents of packages.json to the dependencies section of your package.json
Simply use import instead of Npm.require()
6. rebuild npm modules (since Node version was upgraded to 4.4.7 in Meteor 1.4)
   meteor npm rebuild
7. install native implementation of bcrypt
   meteor npm install --save bcrypt
8. install React
   meteor npm install --save react react-dom react-addons-pure-render-mixin
9. hookup react to meteor reactive data layer
   meteor add react-meteor-data
10. add support for ES2015 modules (installed with new Meteor 1.3 apps)
    meteor npm install --save meteor-node-stubs

Notes

1. As of 1.4, you must ensure your MONGO_OPLOG_URL contains a replicaSet argument (see the changelog and the oplog documentation).