eslint/no-extra-label Style

🛠️ An auto-fix is available for this rule.

What it does

Disallow unnecessary labels.

Why is this bad?

If a loop contains no nested loops or switches, labeling the loop is unnecessary.

A: while (a) {
    break A;
}

You can achieve the same result by removing the label and using break or continue without a label. Probably those labels would confuse developers because they expect labels to jump to further.

Examples

Examples of incorrect code for this rule:

A: while (a) {
    break A;
}

B: for (let i = 0; i < 10; ++i) {
    break B;
}

C: switch (a) {
    case 0:
        break C;
}

Examples of correct code for this rule:

while (a) {
    break;
}

for (let i = 0; i < 10; ++i) {
    break;
}

switch (a) {
    case 0:
        break;
}

A: {
    break A;
}

B: while (a) {
    while (b) {
        break B;
    }
}

C: switch (a) {
    case 0:
        while (b) {
            break C;
        }
        break;
}

How to use

To enable this rule using the config file or in the CLI, you can use:

Config (.oxlintrc.json)

{
    "rules": {
        "no-extra-label": "error"
    }
}

CLI

oxlint --deny no-extra-label

References

• Rule Source