verror-0/lib/esm/cause.js

VError without dependencies on top of nodejs standart library

import { isError } from './is-error.js';
export const cause = (err) => {
    if (!isError(err)) {
        throw new Error('err must be an Error');
    }
    if ('jse_cause' in err) {
        return isError(err.jse_cause) ? err.jse_cause : null;
    }
    return isError(err.cause) ? err.cause : null;
};
export function findCause(err, name) {
    if (!isError(err)) {
        throw new Error('err must be an Error');
    }
    if ((typeof name === 'string' && name.length === 0) ||
        (Array.isArray(name) && name.length === 0) ||
        (name instanceof Set && name.size === 0)) {
        throw new Error('name cannot be empty');
    }
    const nameSet = typeof name === 'string' ? new Set([name]) : Array.isArray(name) ? new Set(name) : name;
    for (let c = err; c !== null; c = cause(c)) {
        if (nameSet.has(c.name))
            return c;
    }
    return null;
}
export function hasCause(err, name) {
    const result = typeof name === 'string'
        ? findCause(err, name)
        : Array.isArray(name)
            ? findCause(err, name)
            : name instanceof Set
                ? findCause(err, name)
                : null;
    if (result === null) {
        if (typeof name === 'string' || Array.isArray(name) || name instanceof Set) {
            return false;
        }
        throw new Error('Invalid type for name');
    }
    return true;
}