8 const variant = process.argv[process.argv.length - 1];  constant
10   case variant === 'main-thread': {
13   case variant === 'main-thread-exit': {
16   case variant.startsWith('worker-thread'): {
17     const worker = new Worker(__filename, { workerData: variant });
33   for (const { execArgv, variant, warnings } of [  property
34     { execArgv: ['--trace-exit'], variant: 'main-thread-exit', warnings: 1 },  property
35     { execArgv: [], variant: 'main-thread-exit', warnings: 0 },  property
36     { execArgv: ['--trace-exit'], variant: 'main-thread', warnings: 0 },  property
37     { execArgv: [], variant: 'main-thread', warnings: 0 },  property
38     { execArgv: ['--trace-exit'], variant: 'worker-thread-exit', warnings: 1 },  property
39     { execArgv: [], variant: 'worker-thread-exit', warnings: 0 },  property
40     { execArgv: ['--trace-exit'], variant: 'worker-thread', warnings: 0 },  property
41     { execArgv: [], variant: 'worker-thread', warnings: 0 },  property
44       await execFile(process.execPath, [...execArgv, __filename, variant]);
54     if (variant.startsWith('worker')) {