font.conf

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>

    <!-- Add generic family. -->
    <match target="pattern">
        <test qual="any" name="family"><string>emoji</string></test>
        <edit name="family" mode="assign" binding="same"><string>Noto Color Emoji</string></edit>
    </match>

    <!-- This adds Noto Color Emoji as a final fallback font for the default font families. -->
    <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>

    <match target="pattern">
        <test name="family"><string>sans-serif</string></test>
        <edit name="family" mode="append"><string>Noto Color Emoji</string></edit>
    </match>

    <match target="pattern">
        <test name="family"><string>monospace</string></test>
        <edit name="family" mode="append"><string>Noto Color Emoji</string></edit>
    </match>

    <!-- Block Symbola from the list of fallback fonts. -->
    <selectfont>
        <rejectfont>
            <pattern>
                <patelt name="family">
                    <string>Symbola</string>
                </patelt>
            </pattern>
        </rejectfont>
    </selectfont>
    <!-- Force apple emoji to noto. -->
    <alias binding="strong">
        <family>emoji</family>
        <default><family>Noto Color Emoji</family></default>
    </alias>
    <alias binding="strong">
        <family>Apple Color Emoji</family>
        <prefer><family>Noto Color Emoji</family></prefer>
    </alias>
    <alias binding="strong">
        <family>Segoe UI Emoji</family>
        <prefer><family>Noto Color Emoji</family></prefer>
    </alias>
    <alias binding="strong">
        <family>Emoji One</family>
        <prefer><family>Noto Color Emoji</family></prefer>
    </alias>
    <!--
    <match>
        <test name="family"><string>Apple Color Emoji</string></test>
        <edit name="family" mode="assign" binding="strong">
            <string>Noto Color Emoji</string>
        </edit>
    </match>
    -->
</fontconfig>