Builder design pattern with #TypeScript

builder-pattern.ts

type TInitValue = string | number | null | undefined;

class Money {
    private value: number | null;

    constructor(initValue: TInitValue) {
        if (!initValue) {
            this.value = null;
            return;
        }

        switch (typeof initValue) {
            case 'string':
                const cleanedValue = initValue.replace(/[^0-9.-]/g, '');
                const parsedValue = parseFloat(cleanedValue);
                this.value = isNaN(parsedValue) ? null : parsedValue || null;
                return;
            case 'number':
                this.value = initValue;
                return;
        }
    }

    cents = (): Money => new Money(this.value ? Math.round(this.value * 100) : null);

    dollars = (): Money => new Money(this.value ? this.value / 100 : null);

    number = (): number | null => this.value || null;

    string = (): string | null => (this.value ? String(this.value) : null);
}

export const money = (value: TInitValue) => {
    return new Money(value);
};