nortax-ts/dist/tax.js

Norwegian Tax Calculator - TypeScript Implementation

"use strict";
/**
 * nortax-ts
 * A TypeScript port of nortax (https://github.com/lewiuberg/nortax)
 * Original Copyright (c) 2023 Lewi Lie Uberg
 * TypeScript port Copyright (c) 2024 Arild Langtind
 * Licensed under the MIT License
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.Tax = void 0;
const types_1 = require("./types");
const constants_1 = require("./constants");
const errors_1 = require("./errors");
class Tax {
    constructor(grossIncome = 0, taxTable = '7100', incomeType = 'Wage', period = 'Monthly', year = 2024) {
        if (!(0, types_1.isValidTableForYear)(taxTable, year)) {
            throw new Error(`Invalid tax table "${taxTable}" for year ${year}`);
        }
        this.grossIncome = Math.round(grossIncome);
        this.taxTable = taxTable;
        this.incomeType = incomeType;
        this.period = period;
        this.year = year;
        this.returnWholeTable = false;
        this.url = '';
    }
    async makeApiCall(url) {
        let response;
        try {
            response = await fetch(url);
        }
        catch (error) {
            throw new errors_1.TaxNetworkError(`Failed to fetch tax data: ${error instanceof Error ? error.message : 'Unknown error'}`);
        }
        if (!response.ok) {
            throw new errors_1.TaxApiError(`API call failed: ${response.statusText}`);
        }
        try {
            const data = await response.json();
            return data === null ? 0 : data;
        }
        catch (error) {
            throw new errors_1.TaxApiError(`Invalid JSON response: ${error instanceof Error ? error.message : 'Unknown error'}`);
        }
    }
    updateUrl() {
        const baseUrl = this.returnWholeTable ? constants_1.TABLE_URL : constants_1.CALCULATE_URL;
        this.url =
            `${baseUrl}?` +
                `${constants_1.ALIASES.chosenTable}=${this.taxTable}&` +
                `${constants_1.ALIASES.chosenIncomeType}=${this.incomeType === 'Wage' ? 'LONN' : 'PENSJON'}&` +
                `${constants_1.ALIASES.chosenPeriod}=${constants_1.PERIODS[this.period]}&` +
                `${constants_1.ALIASES.chosenYear}=${this.year}`;
        if (!this.returnWholeTable) {
            this.url += `&${constants_1.ALIASES.chosenIncome}=${this.grossIncome}`;
        }
    }
    async getDeduction() {
        this.returnWholeTable = false;
        this.updateUrl();
        const data = await this.makeApiCall(this.url);
        return parseInt(data);
    }
    async getNetIncome() {
        const deduction = await this.getDeduction();
        return this.grossIncome - deduction;
    }
    async getWholeTable() {
        this.returnWholeTable = true;
        this.updateUrl();
        const data = await this.makeApiCall(this.url);
        this.returnWholeTable = false;
        return data.alleTrekk;
    }
    async getFullDetails() {
        const deduction = await this.getDeduction();
        const netIncome = await this.getNetIncome();
        return `URL: str = ${this.url}
Tax table: valid_tables = ${this.taxTable}
Income type: income_type = ${this.incomeType}
Period: period = ${this.period}
Year: int = ${this.year}
Gross income: int = ${this.grossIncome}
Tax deduction: int = ${deduction}
Net income: int = ${netIncome}`;
    }
    toString() {
        return `URL: str = ${this.url}
Tax table: valid_tables = ${this.taxTable}
Income type: income_type = ${this.incomeType}
Period: period = ${this.period}
Year: int = ${this.year}
Gross income: int = ${this.grossIncome}`;
    }
    [Symbol.toStringTag]() {
        return `Tax(gross_income=${this.grossIncome}, tax_table="${this.taxTable}", income_type="${this.incomeType}", period="${this.period}", year=${this.year})`;
    }
}
exports.Tax = Tax;