fix(vitest): correctly parse --maxWorkers/--minWorkers (#4924)

docs/guide/cli.md

@@ -74,8 +74,8 @@ Run only [benchmark](https://vitest.dev/guide/features.html#benchmarking-experim
 | `--poolOptions.threads.isolate` | Isolate tests in threads pool (default: `true`)  |
 | `--poolOptions.forks.isolate` | Isolate tests in forks pool (default: `true`)  |
 | `--fileParallelism` | Should all test files run in parallel. Use --no-file-parallelism to disable (default: true) |
-| `--maxWorkers` | Maximum number of workers to run tests in |
-| `--minWorkers` | Minimum number of workers to run tests in |
+| `--maxWorkers <workers>` | Maximum number of workers to run tests in |
+| `--minWorkers <workers>` | Minimum number of workers to run tests in |
 | `--silent` | Silent console output from tests |
 | `--reporter <name>` | Select reporter: `default`, `verbose`, `dot`, `junit`, `json`, or a path to a custom reporter |
 | `--outputFile <filename/-s>` | Write test results to a file when the `--reporter=json` or `--reporter=junit` option is also specified <br /> Via [cac's dot notation] you can specify individual outputs for multiple reporters |

packages/vitest/src/node/cli.ts

@@ -39,8 +39,8 @@ cli
   .option('--poolOptions.threads.isolate', 'Isolate tests in threads pool (default: true)')
   .option('--poolOptions.forks.isolate', 'Isolate tests in forks pool (default: true)')
   .option('--fileParallelism', 'Should all test files run in parallel. Use --no-file-parallelism to disable (default: true)')
-  .option('--maxWorkers', 'Maximum number of workers to run tests in')
-  .option('--minWorkers', 'Minimum number of workers to run tests in')
+  .option('--maxWorkers <workers>', 'Maximum number of workers to run tests in')
+  .option('--minWorkers <workers>', 'Minimum number of workers to run tests in')
   .option('--environment <env>', 'Specify runner environment, if not running in the browser (default: node)')
   .option('--passWithNoTests', 'Pass when no tests found')
   .option('--logHeapUsage', 'Show the size of heap for each test')

packages/vitest/src/node/config.ts

@@ -120,6 +120,12 @@ export function resolveConfig(
     resolved.shard = { index, count }
   }
 
+  if (resolved.maxWorkers)
+    resolved.maxWorkers = Number(resolved.maxWorkers)
+
+  if (resolved.minWorkers)
+    resolved.minWorkers = Number(resolved.minWorkers)
+
   resolved.fileParallelism ??= true
 
   if (!resolved.fileParallelism) {