@buka/class-transformer-extra/dist/esm/src/number/to-number.js

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

import { Transform } from 'class-transformer';
export function ToNumber(options) {
    return Transform(function ToNumberTransform({ value }) {
        if (options?.optional && value === undefined)
            return undefined;
        return Number(value);
    }, options);
}