The Require filter supports Ruby-style
require function calls in expressions are left alone.
If the esm filter is used and the code being required contains
export statements (either explicitly or via the
option), then the require statement will be replaced with an
statement referencing the top level classes, modules, constants, and methods
defined in that source.
require_recursive option is specified, then all symbols defined by all
sources referenced by the transitive closure of all requires defined by that