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I'm using console.assert to test/debug but I'd like to remove this in production code. I'm basically overwriting console.assert to be a noop function right now but wondering if there's a better way. It would be ideal if there was some javascript preprocessor to remove this.

I'm using console.assert to test/debug but I'd like to remove this in production code. I'm basically overwriting console.assert to be a noop function right now but wondering if there's a better way. It would be ideal if there was some javascript preprocessor to remove this.

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Share Improve this question Follow asked Sep 13, 2011 at 6:29 jhchenjhchen 14.8k1414 gold badges6565 silver badges9191 bronze badges 3

• @wukong Except it's ... JavaScript :-) – user166390 Commented Sep 13, 2011 at 6:35
• 4 What about using a test-framework and a debugger? :-) Don't even let that console.assert get in there! – user166390 Commented Sep 13, 2011 at 6:36
• 4 I do that too but found asserts really useful catching errors very early by enforcing expected state wherever I can – jhchen Commented Sep 13, 2011 at 18:13

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3 Answers 3

Sorted by: Reset to default 5

UglifyJS2 does this easily: When running the uglifyjs mand, enable the pressor and tell it to discard console.* calls:

uglifyjs [input files] --press drop_console

---

Quick example:

function doSomething() {
    console.log("This is just a debug message.");
    process.stdout.write("This is actual app code.\n");
}
doSomething();

... gives this when piled with the above mand:

function doSomething(){process.stdout.write("This is actual app code.\n")}doSomething();

---

This might be an UglifyJS2 bug, but be careful about side effects in those calls!

function doSomething() {
    var i = 0;
    console.log("This is just a debug message." + (++i));
    process.stdout.write("This is actual app code." + i + "\n");
}
doSomething();

...piles to

function doSomething(){var i=0;process.stdout.write("This is actual app code."+i+"\n")}doSomething();

... which writes i as 0 instead of 1!

Try Closure Compiler, in advanced mode it removes empty functions (and much more).

Another tool is UglifyJS which is used with nodejs. It's fast and got a lot of options for you to check out.

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