Function isPdfHeader

src/test-utils.ts:178–185

(bytes: Uint8Array)

 * @returns True if bytes start with "%PDF-"
 */
export function isPdfHeader(bytes: Uint8Array) {
  // %PDF- = 0x25 0x50 0x44 0x46 0x2D

  return (
    // Fix: String.fromCharCode(...bytes) expects numbers, and map returns string[]
    String.fromCharCode(...bytes.slice(0, 5)) === "%PDF-"
  );
}

/**
 * Find the PDF version from the header.