a simple question

[zzz6519003]

React = window.React;
delete window.React;

wondering what this does 🍻

[froatsnook]

@zzz6519003 Uhh, maybe some of this is wrong, but I'm pretty sure it works as follows.

In short:

1. react.js assigns React to window
2. React = window.React; makes a package-wide variable which is later exported
3. delete window.React; removes the window variable "leak"

Most of this package defines React in: vendor/react-with-addons-0.13.0.js. This creates window.React.

Normally in Meteor apps:

// This is local to the current file
var ABC = function() { };

// This is globally available in the APP
XYZ = function() { };

But in packages:

// This is local to the current file
var ABC = function() { };

// This is globally available in the PACKAGE
XYZ = function() { };

In order to make a package global variables available in apps that include the package, you take one of these XYZ variables and export it in package.js.

So now to answer your question:

When you say:

XYZ = function() { }; // (i.e. without var)

It assigns to this, which normally happens to be window in the browser. But in a package, it is assigned to something else (for package-wide variables). Assigning React to window would be "bad" because if you didn't export it in package.js it would be visible by apps anyway.

[zzz6519003]

so long story short, it just wanna make it clean, just a good habit? thx buddy! 🍺