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backend/node_modules/pino-std-serializers/lib/err-helpers.js

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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
+}