Magic of 1s and 0s

Instead of this:

const VARIANT_CHAR = /variant of \p{Script=Han}/u;

// 'variant of chineseCharacterHere' sorts last
sort((a, b) =>
    VARIANT_CHAR.test(a.definitions.join(' ')) 
    && VARIANT_CHAR.test(b.definitions.join(' ')) ?
        0
    : VARIANT_CHAR.test(a.definitions.join(' ')) ?
        1
    : VARIANT_CHAR.test(b.definitions.join(' ')) ?
        -1
    :
        0
)  

Just do this:

const VARIANT_CHAR = /variant of \p{Script=Han}/u;

// 'variant of chineseCharacterHere' sorts last
sort((a, b) =>
    VARIANT_CHAR.test(a.definitions.join(' ')) 
    -
    VARIANT_CHAR.test(b.definitions.join(' '))
)