Function isNullRedirectionTarget

src/utils/powershell/parser.ts:1703–1706

(target: string)

 * inside the braces (`${ null }`) name a different variable, so no regex.
 */
export function isNullRedirectionTarget(target: string): boolean {
  const t = target.trim().toLowerCase()
  return t === '$null' || t === '${null}'
}

/**
 * Get output redirections (file redirections, not merging redirections).