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#' @title Throw an error if string is not associated with a loon widget
#'
#' @description
#'
#' Helper function to ensure that a widget path is associated with a
#' loon widget.
#'
#' @param widget widget path name as a string
#'
#' @return TRUE if the string is associated with a loon widget,
#' otherwise an error is thrown.
#'
#' @export
l_throwErrorIfNotLoonWidget <- function(widget) {
if(!l_isLoonWidget(widget)) {
stop(paste('Widget path "', widget,
'" is not a known loon widget.', sep =''),
call.=FALSE)
}
return(TRUE)
}
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