@buka/class-transformer-extra/dist/esm/src/array/uniq-by.js

class-transformer-extra contains methods that's aren't included in the class-transform package.

import { Transform } from 'class-transformer';
import { uniqBy } from 'ramda';
// eslint-disable-next-line @typescript-eslint/no-explicit-any
export function UniqBy(fn, options) {
    return Transform(function UniqByTransform({ value }) {
        return (Array.isArray(value) ? uniqBy(fn, value) : value);
    }, options);
}