backport of util.debuglog from node v0.11
$ npm install debuglog
debuglog - backport of util.debuglog() from node v0.11
To facilitate using the util.debuglog() function that will be available when
node v0.12 is released now, this is a copy extracted from the source.
require('debuglog')
Return util.debuglog, if it exists, otherwise it will return an internal copy
of the implementation from node v0.11.
debuglog(section)
section{String} The section of the program to be debugged- Returns: {Function} The logging function
This is used to create a function which conditionally writes to stderr
based on the existence of a NODE_DEBUG environment variable. If the
section name appears in that environment variable, then the returned
function will be similar to console.error(). If not, then the
returned function is a no-op.
For example:
var debuglog = util.debuglog('foo');
var bar = 123;
debuglog('hello from foo [%d]', bar);
If this program is run with NODE_DEBUG=foo in the environment, then
it will output something like:
FOO 3245: hello from foo [123]
where 3245 is the process id. If it is not run with that
environment variable set, then it will not print anything.
You may separate multiple NODE_DEBUG environment variables with a
comma. For example, NODE_DEBUG=fs,net,tls.
Current Tags
- 1.0.1 ... latest (11 years ago)
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