@canutin/svelte-currency-input/dist/utils/fixedDecimalValue.js

A fully-featured currency input component for Svelte 5 that handles formatting, localization, and validation

export const fixedDecimalValue = (value, decimalSeparator, fixedDecimalLength) => {
    if (fixedDecimalLength !== undefined && value.length > 1) {
        if (fixedDecimalLength === 0) {
            return value.replace(decimalSeparator, '');
        }
        if (value.includes(decimalSeparator)) {
            const [int, decimals] = value.split(decimalSeparator);
            if (decimals.length === fixedDecimalLength) {
                return value;
            }
            if (decimals.length > fixedDecimalLength) {
                return `${int}${decimalSeparator}${decimals.slice(0, fixedDecimalLength)}`;
            }
        }
        const reg = value.length > fixedDecimalLength
            ? new RegExp(`(\\d+)(\\d{${fixedDecimalLength}})`)
            : new RegExp(`(\\d)(\\d+)`);
        const match = value.match(reg);
        if (match) {
            const [, int, decimals] = match;
            return `${int}${decimalSeparator}${decimals}`;
        }
    }
    return value;
};