The mallet will check to see if the variable is falsey, and if it is, override it. It's almost the same as `a = a || b`. Re: 6to5/6to5#516
acorn-6to5
acorn-6to5 is not supported outside of 6to5 usage. Do not expect support if you use this in your own applications.
Deviates from acorn in the following ways:
Description
Languages
JavaScript
99.5%
Makefile
0.3%
HTML
0.1%