Process completed with exit code 31.

file=R/fcast.R,line=139,col=12,[nzchar_linter] Use !nzchar(x) instead of x == "". Note that unlike nzchar(), EQ coerces to character, so you'll have to use as.character() if x is a factor. Whenever missing data is possible, please take care to use nzchar(., keepNA = TRUE); nzchar(NA) is TRUE by default.

file=R/fcast.R,line=139,col=44,[trailing_whitespace_linter] Remove trailing whitespace.

file=R/fcast.R,line=140,col=7,[any_duplicated_linter] anyDuplicated(x, ...) > 0 is better than any(duplicated(x), ...).