no-compare-neg-zero

0 and -0 compare as equal, so x === -0 is also true when x is 0. The minus sign has no effect.

To tell the two apart, use Object.is(x, -0). Otherwise compare with 0.

This rule is on by default.

Configure

On by default as an error. To turn it off:

[lint.rules]
"no-compare-neg-zero" = "off" # or "warn"

Examples

Reported:

if (offset === -0) {
  flipDirection();
}

Not reported:

if (Object.is(offset, -0)) {
  flipDirection();
}

if (offset === 0) {
  stop();
}

<, <=, > and >= are reported too:

const isForward = speed >= -0;