make_bootFUN: make_bootFUN
In jflournoy/permediatr:

make_bootFUN

1	make_bootFUN(x, path = c("a", "b"), is.null.model = F)

`x`	A permediatrMod object with the full mediation specification.
`path`	Which path is being bootstrapped, the 'a' path, or the 'b' path?
`is.null.model`	Should the boot FUN expect to get a null model without the effect of interest? Set this to true of you're doing parametric or semiparametric bootstrapping for the nil null distribution. The `make_null_formula` should be used to create the null model to be the basis for (semi-)parametric simulation.