$resetChannelVar restores a channel-scoped variable to its default value defined in the Bot Creator Variables UI. If no default is defined, the stored value is removed entirely.

When called with only a name, it resets the variable for the current channel. When a Channel ID is provided, it resets the variable for the specified channel.

Use this function to clear channel-specific settings, reset counters, or restore channel defaults. After resetting, $getChannelVar returns the default value (if defined) or an empty string. This function does not return any output.