@daimo/pay/build/src/utils/format.js

Seamless crypto payments. Onboard users from any chain, any coin into your app with one click.

import { formatUnits } from 'viem';

const USD_DECIMALS = 2;
function roundDecimals(value, decimals, round) {
  const factor = 10 ** decimals;
  const multiplied = value * factor;
  let rounded;
  if (round === "up") {
    rounded = Math.ceil(multiplied);
  } else if (round === "down") {
    rounded = Math.floor(multiplied);
  } else {
    rounded = Math.round(multiplied);
  }
  return (rounded / factor).toFixed(decimals);
}
function formatUsd(usd, round = "down") {
  return new Intl.NumberFormat("en-US", {
    style: "currency",
    currency: "USD"
  }).format(Number(roundUsd(usd, round)));
}
function roundUsd(usd, round = "down") {
  return roundDecimals(usd, USD_DECIMALS, round);
}
function roundTokenAmount(amount, token, round = "down") {
  return roundDecimals(
    Number(formatUnits(BigInt(amount), token.decimals)),
    token.displayDecimals,
    round
  );
}
function roundTokenAmountUnits(amountUnits, token, round = "down") {
  return roundDecimals(amountUnits, token.displayDecimals, round);
}
function usdToRoundedTokenAmount(usd, token, round = "down") {
  return roundTokenAmountUnits(usd / token.usd, token, round);
}
function tokenAmountToRoundedUsd(amount, token, round = "nearest") {
  const amountUnits = formatUnits(BigInt(amount), token.decimals);
  return roundUsd(Number(amountUnits) * token.usd, round);
}

export { USD_DECIMALS, formatUsd, roundDecimals, roundTokenAmount, roundTokenAmountUnits, roundUsd, tokenAmountToRoundedUsd, usdToRoundedTokenAmount };
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