  Transverse-momentum dependent (TMD) hadronic wave functions develop
light-cone divergences under QCD corrections, which are commonly regularized by
the rapidity $\zeta$ of gauge vector defining the non-light-like Wilson lines.
The yielding rapidity logarithms from infrared enhancement need to be resummed
for both hadronic wave functions and short-distance functions, to achieve
scheme-independent calculations of physical quantities. We briefly review the
recent progress on the rapidity resummation for $B$-meson wave functions which
are the key ingredients of TMD factorization formulae for radiative-leptonic,
semi-leptonic and non-leptonic $B$-meson decays. The crucial observation is
that rapidity resummation induces a strong suppression of $B$-meson wave
functions at small light-quark momentum, strengthening the applicability of TMD
factorization in exclusive $B$-meson decays. The phenomenological consequence
of rapidity-resummation improved $B$-meson wave functions is further discussed
in the context of $B \to \pi$ transition form factors at large hadronic recoil.
