@snap/camera-kit/dist/common/unionBy.js

Camera Kit Web

export function unionBy(iteratee, ...arrays) {
    const throwIterateeError = () => {
        throw new Error("Iteratee must be a function or a valid property key of the item");
    };
    const seen = new Map();
    for (const item of arrays.flat()) {
        const key = typeof iteratee === "function"
            ? iteratee(item)
            : typeof item === "object" && item !== null && iteratee in item
                ? item[iteratee]
                : throwIterateeError();
        seen.set(key, item);
    }
    return Array.from(seen.values());
}
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