Check if echo mode is enabled on stdin.
external bool get echoMode;void echoMode= (
Enable or disable echo mode on stdin.
If disabled, input from to console will not be echoed.
Default depends on the parent process, but usually enabled.
On Windows this mode can only be enabled if lineMode is enabled as well.
external void set echoMode(bool enabled);
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https://api.dartlang.org/stable/2.0.0/dart-io/Stdin/echoMode.html