no-eq-null.md

规则名	规则类型
no-eq-null	suggestion

Comparing to null without a type-checking operator (== or !=), can have unintended results as the comparison will evaluate to true when comparing to not just a null, but also an undefined value.

if (foo == null) {
  bar();
}

规则详解

The no-eq-null rule aims reduce potential bug and unwanted behavior by ensuring that comparisons to null only match null, and not also undefined. As such it will flag comparisons to null when using == and !=.

此规则的 错误 代码实例：

/*eslint no-eq-null: "error"*/

if (foo == null) {
  bar();
}

while (qux != null) {
  baz();
}

此规则的 正确 代码实例：

::: correct

/*eslint no-eq-null: "error"*/

if (foo === null) {
  bar();
}

while (qux !== null) {
  baz();
}

禁用建议

If you want to enforce type-checking operations in general, use the more powerful eqeqeq instead.

兼容

• JSHint: This rule corresponds to eqnull rule of JSHint.