Interface Expressions

interface Expressions {
    custom?: { [key: string]: Expression };
    preset?: {
        aa?: Expression;
        angry?: Expression;
        blink?: Expression;
        blinkLeft?: Expression;
        blinkRight?: Expression;
        ee?: Expression;
        happy?: Expression;
        ih?: Expression;
        lookDown?: Expression;
        lookLeft?: Expression;
        lookRight?: Expression;
        lookUp?: Expression;
        neutral?: Expression;
        oh?: Expression;
        ou?: Expression;
        relaxed?: Expression;
        sad?: Expression;
        surprised?: Expression;
    };
}