node-debuglog/debuglog.js at master · sam-github/node-debuglog · GitHub

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var util = require('util');

module.exports = (util && util.debuglog) || debuglog;

var debugs = {};

var debugEnviron = process.env.NODE_DEBUG || '';

function debuglog(set) {

set = set.toUpperCase();

if (!debugs[set]) {

if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {

var pid = process.pid;

debugs[set] = function() {

var msg = util.format.apply(exports, arguments);

console.error('%s %d: %s', set, pid, msg);

};

} else {

debugs[set] = function() {};

}

return debugs[set];

};