Introducing aight: the script

This release includes a new aight command-line script that rewrites JavaScript to include IE8-friendly protections. There's only one of these right now, and it's intended to make the current release (3.3.9, as of this writing) of D3 work in IE8, as discussed in this pull request.

bin/aight

There's no --help argument for usage yet, but here's how it works. First off, install aight via npm:

npm install aight
# or, more specifically:
npm install [email protected]

aight reads JavaScript filenames synchronously (or script source from stdin) and prints to stdout:

# make d3.js IE8-friendly
aight d3.js > d3-ie8.js
# or
cat d3.js | aight > d3-ie8.js

You can see what it does by piping in a for..in loop:

echo "var obj = {}; for (var key in obj) console.log(key, obj[key]);" | aight

this outputs (with whitespace for clarity):

var obj = {};
for (var key in obj) if (obj.hasOwnProperty(key)) {
  console.log(key, obj[key]);
}

In a future release I'll be adding usage instructions to the script, and possibly adding a build step that grabs the latest d3.js and transforms it for IE8.