eslint/no-caller Correctness

✅ This rule is turned on by default.

What it does

Disallow the use of arguments.caller or arguments.callee.

Why is this bad?

The use of arguments.caller and arguments.callee make several code optimizations impossible. They have been deprecated in future versions of JavaScript and their use is forbidden in ECMAScript 5 while in strict mode.

function foo() {
  var callee = arguments.callee;
}

This rule is aimed at discouraging the use of deprecated and sub-optimal code by disallowing the use of arguments.caller and arguments.callee. As such, it will warn when arguments.caller and arguments.callee are used.

Example

Examples of incorrect code for this rule:

function foo(n) {
  if (n <= 0) {
    return;
  }

  arguments.callee(n - 1);
}

[1, 2, 3, 4, 5].map(function (n) {
  return !(n > 1) ? 1 : arguments.callee(n - 1) * n;
});

Examples of correct code for this rule:

function foo(n) {
  if (n <= 0) {
    return;
  }

  foo(n - 1);
}

[1, 2, 3, 4, 5].map(function factorial(n) {
  return !(n > 1) ? 1 : factorial(n - 1) * n;
});

References

• Rule Source