readStream.isRaw

boolean 值，如果终端当前配置为作为原始设备运行，则为 true。

¥A boolean that is true if the TTY is currently configured to operate as a raw device.

当进程启动时，此标志始终为 false，即使终端在原始模式下运行也是如此。它的值将随着对 setRawMode 的后续调用而改变。

¥This flag is always false when a process starts, even if the terminal is operating in raw mode. Its value will change with subsequent calls to setRawMode.