javascript - what does (**variable) mean in node.js? -


at https://www.airpair.com/javascript/node-js-tutorial see haven't seen before:

var gzip = zlib.creategzip(); var readstream = fs.createreadstream(**filename); // current file var writestream = fs.createwritestream(**dirname + '/out.gz');

what ** mean in ...(**filename); , ...(**dirname ...);? thank you

it's typo in tutorial. 

var gzip = zlib.creategzip(); var readstream = fs.createreadstream(__filename); // current file var writestream = fs.createwritestream(__dirname + '/out.gz');

they globals in node


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