@yak-spirit/yak-swap-ui/dist/utils/toBaseUnit.js

A reusable React component for swapping with Yield Yak Router. The YY Router can be found [here](https://github.com/yieldyak/yak-aggregator).

import { BigNumber } from 'bignumber.js';
function isString(s) {
    return typeof s === 'string' || s instanceof String;
}
export function toBaseUnit(value, decimals) {
    if (!isString(value)) {
        throw new Error('Pass strings to prevent floating point precision issues.');
    }
    const ten = new BigNumber(10);
    const base = ten.pow(new BigNumber(decimals));
    // Is it negative?
    const negative = value.substring(0, 1) === '-';
    if (negative) {
        value = value.substring(1);
    }
    if (value === '.') {
        throw new Error(`Invalid value ${value} cannot be converted to` + ` base unit with ${decimals} decimals.`);
    }
    // Split it into a whole and fractional part
    const comps = value.split('.');
    if (comps.length > 2) {
        throw new Error('Too many decimal points');
    }
    let whole = comps[0];
    let fraction = comps[1];
    if (!whole) {
        whole = '0';
    }
    if (!fraction) {
        fraction = '0';
    }
    if (fraction.length > decimals) {
        throw new Error('Too many decimal places');
    }
    while (fraction.length < decimals) {
        fraction += '0';
    }
    whole = new BigNumber(whole);
    fraction = new BigNumber(fraction);
    let wei = whole.multipliedBy(base).plus(fraction);
    if (negative) {
        wei = wei.absoluteValue();
    }
    return new BigNumber(wei.toString(10), 10);
}