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metamask-extension/ui/app/hooks/useEthFiatAmount.js
Erik Marks 76a2a9bb8b
@metamask/eslint config@5.0.0 (#10358)
* @metamask/eslint-config@5.0.0
* Update eslintrc and prettierrc
* yarn lint:fix
2021-02-04 10:15:23 -08:00

51 lines
1.8 KiB
JavaScript

import { useMemo } from 'react';
import { useSelector } from 'react-redux';
import {
getConversionRate,
getCurrentCurrency,
getShouldShowFiat,
} from '../selectors';
import { decEthToConvertedCurrency } from '../helpers/utils/conversions.util';
import { formatCurrency } from '../helpers/utils/confirm-tx.util';
/**
* Get an Eth amount converted to fiat and formatted for display
*
* @param {string} [tokenAmount] - The eth amount to convert
* @param {Object} [overrides] - A configuration object that allows the called to explicitly
* ensure fiat is shown even if the property is not set in state.
* @param {boolean} [overrides.showFiat] - If truthy, ensures the fiat value is shown even if the showFiat value from state is falsey
* @param {boolean} hideCurrencySymbol Indicates whether the returned formatted amount should include the trailing currency symbol
* @return {string} - The formatted token amount in the user's chosen fiat currency
*/
export function useEthFiatAmount(
ethAmount,
overrides = {},
hideCurrencySymbol,
) {
const conversionRate = useSelector(getConversionRate);
const currentCurrency = useSelector(getCurrentCurrency);
const userPrefersShownFiat = useSelector(getShouldShowFiat);
const showFiat = overrides.showFiat ?? userPrefersShownFiat;
const formattedFiat = useMemo(
() => decEthToConvertedCurrency(ethAmount, currentCurrency, conversionRate),
[conversionRate, currentCurrency, ethAmount],
);
if (
!showFiat ||
currentCurrency.toUpperCase() === 'ETH' ||
conversionRate <= 0 ||
ethAmount === undefined
) {
return undefined;
}
return hideCurrencySymbol
? formatCurrency(formattedFiat, currentCurrency)
: `${formatCurrency(
formattedFiat,
currentCurrency,
)} ${currentCurrency.toUpperCase()}`;
}