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use_data_table() imports the data.table() function from the data.table package, as well as several important symbols: :=, .SD, .BY, .N, .I, .GRP, .NGRP, .EACHI. This is a minimal setup to get data.tables working with your package. See the importing data.table vignette for other strategies. In addition to importing these function, use_data_table() also blocks the usage of data.table in the Depends field of the DESCRIPTION file; data.table should be used as an imported or suggested package only. See this discussion.