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Can only be used in a module expression. Emulates the effect of base::require() in its containing module, making functions and their chain of environment availab.e Masks base::require() inside a module context.
require(package)
name of the package; name or character
NULL; invisible
NULL
# NOT RUN { mod_tcl <- mod::ule({ mod:::require(tcltk) # It is suggested to omit mod::: when using f <- tcl }) identical(mod_tcl$f, tcltk::tcl) # }
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