@netlify/redirect-parser/lib/status.js

Parses netlify redirects into a js object representation

// Normalize `status` field
export const normalizeStatus = function (status) {
    if (status === undefined) {
        return;
    }
    const statusCode = transtypeStatusCode(status);
    if (!isValidStatusCode(statusCode)) {
        throw new Error(`Invalid status code: ${status}`);
    }
    return statusCode;
};
// Transtype `status` string to a number.
// `status` might be a string ending with `!`. If so, `Number.parseInt()` strips
// and ignores it.
export const transtypeStatusCode = function (status) {
    return Number.parseInt(status);
};
// Check whether the field is a valid status code
export const isValidStatusCode = function (status) {
    return Number.isInteger(status);
};