word-number-word/dist/wordToCurrency.js

A TypeScript/JavaScript utility for converting numbers to words and vice versa — including support for decimals, negatives, and currency converting.

import { wordToNumber } from "./wordToNumber";
const CURRENCY_LABELS = {
    usd: { major: "dollar", minor: "cent" },
    bdt: { major: "taka", minor: "poisha" },
    eur: { major: "euro", minor: "cent" },
    gbp: { major: "pound", minor: "pence" },
};
function normalizeWordFormat(input) {
    // Reject mixed formats like: "forty-two and one"
    const invalidHyphenPattern = /\w+-\w+(?=\s\w)/;
    if (invalidHyphenPattern.test(input)) {
        throw new Error('Use consistent word formatting: either "forty two" or "forty-two"');
    }
    return input.replace(/-/g, " "); // Convert hyphen to space
}
export function wordToCurrency(input, currency) {
    if (!(currency in CURRENCY_LABELS)) {
        throw new Error(`Unsupported currency type: "${currency}". Use one of: ${Object.keys(CURRENCY_LABELS).join(", ")}`);
    }
    const { major, minor } = CURRENCY_LABELS[currency];
    const pluralMajor = `${major}s`;
    const pluralMinor = `${minor}s`;
    input = input.trim().toLowerCase();
    const isNegative = input.startsWith("minus ");
    if (isNegative)
        input = input.slice(6).trim();
    input = normalizeWordFormat(input);
    // Try to split by " and "
    let [majorPartRaw, minorPartRaw] = input.split(" and ");
    if (!majorPartRaw) {
        throw new Error("Major currency part is missing.");
    }
    // Remove currency keywords
    const majorWords = majorPartRaw
        .replace(new RegExp(`\\b${pluralMajor}\\b|\\b${major}\\b`, "g"), "")
        .trim();
    let minorValue = 0;
    if (minorPartRaw) {
        const minorWords = minorPartRaw
            .replace(new RegExp(`\\b${pluralMinor}\\b|\\b${minor}\\b`, "g"), "")
            .trim();
        if (minorWords.length > 0) {
            minorValue = wordToNumber(minorWords);
        }
    }
    const majorValue = wordToNumber(majorWords);
    const result = parseFloat(`${majorValue}.${minorValue.toString().padStart(2, "0")}`);
    return isNegative ? -result : result;
}