01-emoji.conf

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
    <alias>
    <!-- Change the string in the family tag to whatever font -->
        <family>serif</family>
        <prefer><family>Noto Serif</family></prefer>
    </alias>
    <alias>
        <family>sans-serif</family>
        <prefer><family>Noto Sans</family></prefer>
    </alias>
    <alias>
        <family>sans</family>
        <prefer><family>Noto Sans</family></prefer>
    </alias>
    <alias>
        <family>monospace</family>
        <prefer><family>Noto Mono</family></prefer>
    </alias>

    <!-- This adds Noto Color Emoji to the font families sans, serif, sans-serif and monospace -->
    <match target="pattern">
        <test name="family"><string>monospace</string></test>
        <edit name="family" mode="append"><string>Noto Color Emoji</string></edit>
    </match>
    <match target="pattern">
        <test name="family"><string>sans</string></test>
        <edit name="family" mode="append"><string>Noto Color Emoji</string></edit>
    </match>

    <match target="pattern">
        <test name="family"><string>serif</string></test>
        <edit name="family" mode="append"><string>Noto Color Emoji</string></edit>
    </match>
    <!-- Discord loads the system's sans-serif font family, add Noto Color Emoji to it -->
    <match target="pattern">
        <test name="family"><string>sans-serif</string></test>
        <edit name="family" mode="append"><string>Noto Color Emoji</string></edit>
    </match>

    <!-- Add emoji generic family -->
    <alias binding="strong">
        <family>emoji</family>
        <default><family>Noto Color Emoji</family></default>
    </alias>

    <!-- Alias requests for the other emoji fonts -->
    <alias binding="strong">
        <family>Apple Color Emoji</family>
        <prefer><family>Noto Color Emoji</family></prefer>
        <default><family>emoji</family></default>
    </alias>
    <alias binding="strong">
        <family>Segoe UI Emoji</family>
        <prefer><family>Noto Color Emoji</family></prefer>
        <default><family>emoji</family></default>
    </alias>
</fontconfig>