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'use strict' // ************************************************************** // * Code initially copied/adapted from "pony-cause" npm module * // * Please upstream improvements there * // ************************************************************** const isErrorLike = (err) => { return err && typeof err.message === 'string' } /** * @param {Error|{ cause?: unknown|(()=>err)}} err * @returns {Error|Object|undefined} */ const getErrorCause = (err) => { if (!err) return /** @type {unknown} */ // @ts-ignore const cause = err.cause // VError / NError style causes if (typeof cause === 'function') { // @ts-ignore const causeResult = err.cause() return isErrorLike(causeResult) ? causeResult : undefined } else { return isErrorLike(cause) ? cause : undefined } } /** * Internal method that keeps a track of which error we have already added, to avoid circular recursion * * @private * @param {Error} err * @param {Set<Error>} seen * @returns {string} */ const _stackWithCauses = (err, seen) => { if (!isErrorLike(err)) return '' const stack = err.stack || '' // Ensure we don't go circular or crazily deep if (seen.has(err)) { return stack + '\ncauses have become circular...' } const cause = getErrorCause(err) if (cause) { seen.add(err) return (stack + '\ncaused by: ' + _stackWithCauses(cause, seen)) } else { return stack } } /** * @param {Error} err * @returns {string} */ const stackWithCauses = (err) => _stackWithCauses(err, new Set()) /** * Internal method that keeps a track of which error we have already added, to avoid circular recursion * * @private * @param {Error} err * @param {Set<Error>} seen * @param {boolean} [skip] * @returns {string} */ const _messageWithCauses = (err, seen, skip) => { if (!isErrorLike(err)) return '' const message = skip ? '' : (err.message || '') // Ensure we don't go circular or crazily deep if (seen.has(err)) { return message + ': ...' } const cause = getErrorCause(err) if (cause) { seen.add(err) // @ts-ignore const skipIfVErrorStyleCause = typeof err.cause === 'function' return (message + (skipIfVErrorStyleCause ? '' : ': ') + _messageWithCauses(cause, seen, skipIfVErrorStyleCause)) } else { return message } } /** * @param {Error} err * @returns {string} */ const messageWithCauses = (err) => _messageWithCauses(err, new Set()) module.exports = { isErrorLike, getErrorCause, stackWithCauses, messageWithCauses }