Function stripBom

src/commands/test.ts:907–909

* Drop a leading UTF-8 BOM (U+FEFF) from a freshly-read file. PowerShell 5.1's * default `Set-Content -Encoding utf8` writes a BOM; without this strip, * `JSON.parse` fails with an invisible "Unexpected token" error that renders * as a blank character on most consoles. Most JSON parsers strip BOM

(raw: string)

 * boundary — we just bring this one in line.
 */
function stripBom(raw: string): string {
  return raw.charCodeAt(0) === 0xfeff ? raw.slice(1) : raw;
}

function requireNonEmpty(flagName: string, value: string): void {
  if (typeof value !== 'string' || value.trim().length === 0) {