Requires the openxlsx package (install.packages("openxlsx")).
condformat2excel(
x,
filename,
sheet_name = "Sheet1",
overwrite_wb = FALSE,
overwrite_sheet = TRUE
)condformat2excelsheet(), to write into a worksheet of an
openxlsx workbook you're building yourself, so you can add more
sheets or apply extra openxlsx formatting before saving.