@studnicky/v8/switch-statements

Requires each switch case to delegate rather than contain inline multi-statement logic. A case body wrapped in a block is reported, as is an unwrapped case with two or more statements after ignoring one trailing break, continue, or return. A single delegated call or return, optionally followed by one of those terminators, is allowed.

This is a readability and structure rule, not a V8-performance rule. On Node v24, a 20-case integer switch with one-line delegating bodies and one with multi-statement bodies both emitted the same SwitchOnSmiNoFeedback dispatch bytecode. The related max-switch-cases rule addresses the measured performance threshold for case count.

Fixable: No · Options: No · Suggested severity: error

✗ Incorrect

switch (action) {
  case 'start': {
    const result = initialize();
    return result;
  }
  case 'stop':
    cleanup();
    audit();
    break;
}

✓ Correct

switch (action) {
  case 'start': return initialize();
  case 'stop':
    cleanup();
    break;
  default: return undefined;
}

function stop(): void {
  cleanup();
  audit();
}

switch (action) {
  case 'stop':
    stop();
    break;
}