$ pacman -Qs ttf-font
local/ttf-dejavu 2.37-2
    Font family based on the Bitstream Vera Fonts with a wider range of characters
local/ttf-freefont 20120503-5
    Set of free outline fonts covering the Unicode character set

$ pacman -Qi ttf-font
Name            : ttf-dejavu
Version         : 2.37-2
Description     : Font family based on the Bitstream Vera Fonts with a wider range of characters
Architecture    : any
URL             : https://dejavu-fonts.github.io/
Licenses        : custom
Groups          : None
Provides        : ttf-font
Depends On      : fontconfig  xorg-fonts-encodings  xorg-mkfontscale  xorg-mkfontdir
Optional Deps   : None
Required By     : firefox-developer-edition
Optional For    : jdk6
Conflicts With  : None
Replaces        : None
Installed Size  : 9,75 MiB
Packager        : Jan de Groot <jgc@archlinux.org>
Build Date      : So 17. února 2018, 00:03:31 CET
Install Date    : Út 11. září 2018, 00:24:17 CEST
Install Reason  : Explicitly installed
Install Script  : No
Validated By    : Signature

$ from /var/log/pacman.log
[2018-07-02 11:59] [PACMAN] Running 'pacman -S firefox-developer-edition'
[2018-07-02 11:59] [ALPM] transaction started
[2018-07-02 11:59] [ALPM] installed mozilla-common (1.4-5)
[2018-07-02 11:59] [ALPM-SCRIPTLET] relogin or source /etc/profile.d/mozilla-common.sh
[2018-07-02 11:59] [ALPM] installed mailcap (2.1.48+14+g5811758-1)
[2018-07-02 11:59] [ALPM] installed hunspell-en_US (2017.01.22-2)
[2018-07-02 11:59] [ALPM] installed xorg-bdftopcf (1.1-1)
[2018-07-02 11:59] [ALPM] installed xorg-mkfontscale (1.1.3-1)
[2018-07-02 11:59] [ALPM] installed xorg-mkfontdir (1.0.7-8)
[2018-07-02 11:59] [ALPM-SCRIPTLET] Creating X fontdir indices... done.
[2018-07-02 11:59] [ALPM] installed xorg-font-util (1.3.1-2)
[2018-07-02 11:59] [ALPM] installed xorg-font-utils (7.6-5)
[2018-07-02 11:59] [ALPM] installed ttf-freefont (20120503-5)
[2018-07-02 11:59] [ALPM] installed firefox-developer-edition (62.0b4-1)
[2018-07-02 11:59] [ALPM] transaction completed