framework/console/controllers/BaseMigrateController.php
private function findMigrationPath($namespace)
    {
        if (empty($namespace)) {
            return is_array($this->migrationPath) ? reset($this->migrationPath) : $this->migrationPath;
        }

        if (!in_array($namespace, $this->migrationNamespaces, true)) {
            throw new Exception("Namespace '{$namespace}' not found in `migrationNamespaces`");
        }

        return $this->getNamespacePath($namespace);
    }
private function findMigrationPath($namespace)
    {
        if (empty($namespace)) {
            return is_array($this->migrationPath) ? reset($this->migrationPath) : $this->migrationPath;
        }

        if (!in_array($namespace, $this->migrationNamespaces, true)) {
            throw new Exception("Namespace '{$namespace}' not found in `migrationNamespaces`");
        }

        return $this->getNamespacePath($namespace);
    }
Finds the file path for the specified migration namespace.
@param string|null $namespace migration namespace.
@return string migration file path.
@throws Exception on failure.
@since 2.0.10