mirror of
https://github.com/kremalicious/metamask-extension.git
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23 lines
613 B
JavaScript
23 lines
613 B
JavaScript
const {
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multiplyCurrencies,
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subtractCurrencies,
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} = require('../../../../conversion-util')
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const ethUtil = require('ethereumjs-util')
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function calcMaxAmount ({ balance, gasTotal, selectedToken, tokenBalance }) {
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const { decimals } = selectedToken || {}
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const multiplier = Math.pow(10, Number(decimals || 0))
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return selectedToken
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? multiplyCurrencies(tokenBalance, multiplier, {toNumericBase: 'hex'})
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: subtractCurrencies(
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ethUtil.addHexPrefix(balance),
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ethUtil.addHexPrefix(gasTotal),
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{ toNumericBase: 'hex' }
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)
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}
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module.exports = {
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calcMaxAmount,
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}
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