7e4f720e8e
A normal dependency of X on Y consists of a "must-use" constraint ("if X is
loaded, Y must be loaded too") and an "ordering" constraint ("if X and Y are
both loaded, Y must be loaded before X").
The previously-existing support for "unordered" dependencies allows you to
create a dependency with "must-use" but not "ordering". This commit adds "weak"
dependencies, which have "ordering" but not "must-use".
As an example, the accounts-base package wants to define some Handlebars helpers
like {{currentUser}} if the handlebars package is being used, but it's fine to
use accounts-base without handlebars. So it should declare a weak dependency on
handlebars.
A package can tell if another package has already been loaded by checking to see
if `Packages.foo` exists. (So as a result, even slices which export no variables
get a `Packages.foo = {}` line.) Weak dependencies do not import symbols into
your namespace; you must access their symbols through
`Packages.foo.someExportedSymbol`. You don't get to use plugins from your weak
dependency.
Meteor
Meteor is an ultra-simple environment for building modern web applications.
With Meteor you write apps:
- in pure Javascript
- that send data over the wire, rather than HTML
- using your choice of popular open-source libraries
Documentation is available at http://docs.meteor.com/
Quick Start
Install Meteor:
curl https://install.meteor.com | /bin/sh
Create a project:
meteor create try-meteor
Run it:
cd try-meteor
meteor
Deploy it to the world, for free:
meteor deploy try-meteor.meteor.com
Slow Start (for developers)
If you want to run on the bleeding edge, or help develop Meteor, you can run Meteor directly from a git checkout.
git clone git://github.com/meteor/meteor.git
cd meteor
If you're the sort of person who likes to build everything from scratch, you can build all the Meteor dependencies (node.js, npm, mongodb, etc) with the provided script. If you do not run this script, Meteor will automatically download pre-compiled binaries when you first run it.
# OPTIONAL
./scripts/generate-dev-bundle.sh
Now you can run meteor directly from the checkout (if you did not build the dependency bundle above, this will take a few moments to download a pre-build version).
./meteor --help
From your checkout, you can read the docs locally. The /docs directory is a
meteor application, so simply change into the /docs directory and launch
the app:
cd docs/
meteor
You'll then be able to read the docs locally in your browser at
http://localhost:3000/
Note that if you run Meteor from a git checkout, you cannot pin apps to specific
Meteor releases or run using different Meteor releases using --release.
Uninstalling Meteor
Aside from a short launcher shell script, Meteor installs itself inside your home directory. To uninstall Meteor, run:
rm -rf ~/.meteor/
sudo rm /usr/local/bin/meteor
Developer Resources
Building an application with Meteor?
- Announcement list: sign up at http://www.meteor.com/
- Ask a question: http://stackoverflow.com/questions/tagged/meteor
- Meteor help and discussion mailing list: https://groups.google.com/group/meteor-talk
- IRC:
#meteoronirc.freenode.net
Interested in contributing to Meteor?
- Core framework design mailing list: https://groups.google.com/group/meteor-core
- Contribution guidelines: https://github.com/meteor/meteor/tree/devel/Contributing.md