no-console

console.log() calls added while debugging are easy to forget. In a web page they show up in every visitor's console, and in a library they write to the output of someone else's program.

Any property of the global console is reported, whether it's called or not. A local variable named console isn't.

Configure

Off by default. To turn it on:

[lint.rules]
"no-console" = "error" # or "warn"

Every option, set to its default. The ones that are commented out are unset by default.

[lint.rules]
"no-console" = ["error", {
  # allow = <list of strings>,
}]

Examples

Reported:

console.log("loaded", items.length);

items.forEach(console.warn);

Not reported:

import { logger } from "./logger.js";

logger.info("loaded", items.length);

function report(console) {
  console.log("done");
}

Options

Option	Default	What it does
allow	none	The console methods to allow.

[lint.rules]
no-console = ["error", { allow = ["warn", "error"] }]

console.error("could not save", reason);

console.log("saved");

When not to use it

In a CLI tool or a script, console is how the program talks to its user. Turn the rule off there.