Type of bond(s) in ${\mathrm{B}}_2{\mathrm{H}}_6$

The structure of B2H6 is as follows.
B atoms and four hydrogen are joined together by covalent bonds.
There are therefore four 2 centred by 2 electron bonds.
Two hydrogen atoms and two boron atoms are linked together by a bridge. Consequently, there are two 3-centre, 2-electron bonds.

$\mathrm{B}-\mathrm{H}\left(2c-2e^{-}\right)$

$\text{ B H B }\left(3c-2e^{-}\right)$