const s = 1000;
const m = s * 60;
const h = m * 60;
const d = h * 24;
const w = d * 7;
const y = d * 365.25;
function msFn(value, options) {
    try {
        if (typeof value === 'string' && value.length > 0) {
            return parse(value);
        } else if (typeof value === 'number' && isFinite(value)) {
            return options?.long ? fmtLong(value) : fmtShort(value);
        }
        throw new Error('Value is not a string or number.');
    } catch (error) {
        const message = isError(error) ? `${error.message}. value=${JSON.stringify(value)}` : 'An unknown error has occurred.';
        throw new Error(message);
    }
}
function parse(str) {
    if (str.length > 100) {
        throw new Error('Value exceeds the maximum length of 100 characters.');
    }
    const match = /^(?<value>-?(?:\d+)?\.?\d+) *(?<type>milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)?$/i.exec(str);
    const groups = match?.groups;
    if (!groups) {
        return NaN;
    }
    const n = parseFloat(groups.value);
    const type = (groups.type || 'ms').toLowerCase();
    switch (type) {
        case 'years':
        case 'year':
        case 'yrs':
        case 'yr':
        case 'y':
            return n * y;
        case 'weeks':
        case 'week':
        case 'w':
            return n * w;
        case 'days':
        case 'day':
        case 'd':
            return n * d;
        case 'hours':
        case 'hour':
        case 'hrs':
        case 'hr':
        case 'h':
            return n * h;
        case 'minutes':
        case 'minute':
        case 'mins':
        case 'min':
        case 'm':
            return n * m;
        case 'seconds':
        case 'second':
        case 'secs':
        case 'sec':
        case 's':
            return n * s;
        case 'milliseconds':
        case 'millisecond':
        case 'msecs':
        case 'msec':
        case 'ms':
            return n;
        default:
            throw new Error(`The unit ${type} was matched, but no matching case exists.`);
    }
}
export default msFn;
function fmtShort(ms) {
    const msAbs = Math.abs(ms);
    if (msAbs >= d) {
        return `${Math.round(ms / d)}d`;
    }
    if (msAbs >= h) {
        return `${Math.round(ms / h)}h`;
    }
    if (msAbs >= m) {
        return `${Math.round(ms / m)}m`;
    }
    if (msAbs >= s) {
        return `${Math.round(ms / s)}s`;
    }
    return `${ms}ms`;
}
function fmtLong(ms) {
    const msAbs = Math.abs(ms);
    if (msAbs >= d) {
        return plural(ms, msAbs, d, 'day');
    }
    if (msAbs >= h) {
        return plural(ms, msAbs, h, 'hour');
    }
    if (msAbs >= m) {
        return plural(ms, msAbs, m, 'minute');
    }
    if (msAbs >= s) {
        return plural(ms, msAbs, s, 'second');
    }
    return `${ms} ms`;
}
function plural(ms, msAbs, n, name) {
    const isPlural = msAbs >= n * 1.5;
    return `${Math.round(ms / n)} ${name}${isPlural ? 's' : ''}`;
}
function isError(value) {
    return typeof value === 'object' && value !== null && 'message' in value;
}