kbhit() in c same function in dart

Question

I want to use kbhit() in c function in dart, but I don't find function in dart that work same kbhit().can you help me?

Stdin.echoMode = false;
Stdin.lineMode = false;

Stdin.readByteSync();

I tried with this code create a function that worked same kbhit(), but when use that function terminal blocked. I don't want to terminal blocked until press a key like kbhit() function.