@easymoney/money/dist/calculator/calculator.js

Best way to do money in js

import { fromNumber } from "../number";
import { customRound } from "./round";
import { assert } from "@easymoney/core";
export function createCalculator() {
    const instance = {
        compare,
        add,
        subtract,
        multiply,
        divide,
        ceil,
        absolute,
        floor,
        share,
        round,
        mod
    };
    return instance;
}
const subtract = function (amount, subtrahend) {
    const result = Number(amount) - Number(subtrahend);
    assertInteger(result);
    return String(result);
};
const compare = function (a, b) {
    return a < b ? -1 : a > b ? 1 : 0;
};
const add = function (amount, addend) {
    const result = Number(amount) + Number(addend);
    assertInteger(result);
    return String(result);
};
const multiply = function (amount, multiplier) {
    const result = Number(amount) * Number(multiplier);
    assertIntegerBounds(result);
    return fromNumber(result).toString();
};
function castInteger(amount) {
    assertIntegerBounds(amount);
    return String(parseInt(String(amount), 10));
}
function assertInteger(amount) {
    const newAmount = Number(amount);
    assert(typeof newAmount === "number" && Number.isInteger(newAmount), new TypeError("The result of arithmetic operation is not an integer"));
}
function assertIntegerBounds(amount) {
    assert(!(amount > Number.MAX_SAFE_INTEGER), new RangeError("You overflowed the maximum allowed integer (Number.MAX_SAFE_INTEGER)"));
    assert(!(amount < -Number.MAX_SAFE_INTEGER), new RangeError("You underflowed the minimum allowed integer (-Number.MAX_SAFE_INTEGER)"));
}
const ceil = function (number) {
    return castInteger(Math.ceil(Number(number)));
};
const floor = function (number) {
    return castInteger(Math.floor(Number(number)));
};
const divide = function (amount, divisor) {
    const result = Number(amount) / Number(divisor);
    assertIntegerBounds(result);
    return fromNumber(result).toString();
};
const absolute = function (number) {
    const result = Math.abs(Number(number));
    assertIntegerBounds(result);
    return String(result);
};
const round = function (number, roundingMode) {
    return castInteger(customRound(Number(number), roundingMode));
};
const share = function (amount, ratio, total) {
    return castInteger(Math.floor((Number(amount) * Number(ratio)) / Number(total)));
};
const mod = function (amount, divisor) {
    const result = Number(amount) % Number(divisor);
    assertIntegerBounds(result);
    return String(result);
};
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