Function onKey

src/setup/prompt.ts:172–205

(_str: string, key: { name?: string; ctrl?: boolean } | undefined)

    };

    const onKey = (_str: string, key: { name?: string; ctrl?: boolean } | undefined): void => {
      if (!key) return;
      if (key.ctrl && key.name === 'c') {
        if (numTimer) clearTimeout(numTimer);
        cleanup();
        stdout.write('\n');
        process.exit(130); // SIGINT — user cancelled setup
      } else if (key.name === 'return' || key.name === 'enter') {
        if (numTimer) clearTimeout(numTimer);
        commitNumBuf();        // a pending number jump lands on that row first
        cleanup();
        resolve(options[idx]!.value);
      } else if (key.name === 'escape') {
        if (numTimer) clearTimeout(numTimer);
        cleanup();
        resolve(defaultValue);
      } else if (key.name && /^[0-9]$/.test(key.name)) {
        // Build up a (possibly multi-digit) number; move the cursor there. Enter confirms.
        // A short idle delay auto-moves so single-digit jumps still feel instant.
        numBuf += key.name;
        if (numTimer) clearTimeout(numTimer);
        const asNum = parseInt(numBuf, 10);
        // If no longer number could extend this into a valid index, commit immediately.
        const couldGrow = asNum * 10 <= options.length;
        if (!couldGrow) { commitNumBuf(); }
        else {
          if (asNum >= 1 && asNum <= options.length) { idx = asNum - 1; render(); }
          numTimer = setTimeout(() => { numBuf = ''; }, 600);
        }
      } else {
        const next = moveSelection(idx, key.name, options.length);
        if (next !== idx) { idx = next; render(); }
      }
    };

    readline.emitKeypressEvents(stdin);
    if (stdin.isTTY) (stdin as any).setRawMode(true);