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Add support for variable currency decimal position
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| import assert from "assert"; | ||
|
|
||
| export class CurrencyUtils { | ||
| /** | ||
| * Converts a string (e.g., "10.44") or BigInt to a Number. | ||
| * @param {string | bigint} value - The monetary value as a string or BigInt. | ||
| * @param {number} decimals - Currency decimals. | ||
| * @returns {number} - The monetary value as a Number. | ||
| */ | ||
| static toNumber(value: string | bigint, decimals = 2): number { | ||
| if (typeof value === "string") { | ||
| return parseFloat(value); | ||
| } | ||
| if (typeof value === "bigint") { | ||
| return Number(value) / Math.pow(10, decimals); | ||
| } | ||
| throw new TypeError("Invalid type for conversion to Number"); | ||
| } | ||
|
|
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| /** | ||
| * Converts a string (e.g., "10.44") to a BigInt representing the smallest unit. | ||
| * @param {string} value - The monetary value as a string. | ||
| * @param {number} decimals - Currency decimals. | ||
| * @returns {bigint} - The amount in the smallest unit as a BigInt. | ||
| */ | ||
| static toBigInt(value: string, decimals = 2): bigint { | ||
| const [whole, fraction = "0"] = value.split("."); | ||
| assert(whole); | ||
| const fractionPadded = fraction.padEnd(decimals, "0"); // Ensure required decimals | ||
| return ( | ||
| BigInt(whole) * BigInt(Math.pow(10, decimals)) + | ||
| BigInt(fractionPadded.slice(0, decimals)) | ||
| ); | ||
| } | ||
|
|
||
| /** | ||
| * Converts a BigInt to a string with the appropriate decimal places. | ||
| * @param {bigint} value - The amount in the smallest unit as a BigInt. | ||
| * @param {number} decimals - Currency decimals. | ||
| * @returns {string} - The monetary value as a string. | ||
| */ | ||
| static toString(value: bigint, decimals = 2): string { | ||
| const isNegative = value < 0n; | ||
| const absoluteValue = isNegative ? -value : value; | ||
|
|
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| const divisor = BigInt(Math.pow(10, decimals)); | ||
| const whole = absoluteValue / divisor; | ||
| const fraction = absoluteValue % divisor; | ||
|
|
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| const result = `${whole}.${fraction.toString().padStart(decimals, "0")}`; | ||
| return isNegative ? `-${result}` : result; | ||
| } | ||
|
|
||
| static format( | ||
| locale: string, | ||
| amount: bigint, | ||
| currency: string, | ||
| currencyDecimals: number, | ||
| ) { | ||
| // Convert the amount to a floating-point number with appropriate precision | ||
| const amountInUnits = Number(amount) / Math.pow(10, currencyDecimals); | ||
|
|
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| // Handle the case where the value has many decimal places for small units (e.g., BTC, ETH) | ||
| return Intl.NumberFormat(locale, { | ||
| currency, | ||
| style: "currency", | ||
| minimumFractionDigits: Math.min(2, currencyDecimals), // Ensure minimum fraction digits | ||
| maximumFractionDigits: currencyDecimals, // Format using the given currency decimals | ||
| }).format(amountInUnits); | ||
| } | ||
| } |
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