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backend/node_modules/pino/lib/proto.js

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+'use strict'
+
+/* eslint no-prototype-builtins: 0 */
+
+const { EventEmitter } = require('node:events')
+const {
+  lsCacheSym,
+  levelValSym,
+  setLevelSym,
+  getLevelSym,
+  chindingsSym,
+  parsedChindingsSym,
+  mixinSym,
+  asJsonSym,
+  writeSym,
+  mixinMergeStrategySym,
+  timeSym,
+  timeSliceIndexSym,
+  streamSym,
+  serializersSym,
+  formattersSym,
+  errorKeySym,
+  messageKeySym,
+  useOnlyCustomLevelsSym,
+  needsMetadataGsym,
+  redactFmtSym,
+  stringifySym,
+  formatOptsSym,
+  stringifiersSym,
+  msgPrefixSym,
+  hooksSym
+} = require('./symbols')
+const {
+  getLevel,
+  setLevel,
+  isLevelEnabled,
+  mappings,
+  initialLsCache,
+  genLsCache,
+  assertNoLevelCollisions
+} = require('./levels')
+const {
+  asChindings,
+  asJson,
+  buildFormatters,
+  stringify,
+  noop
+} = require('./tools')
+const {
+  version
+} = require('./meta')
+const redaction = require('./redaction')
+
+// note: use of class is satirical
+// https://github.com/pinojs/pino/pull/433#pullrequestreview-127703127
+const constructor = class Pino {}
+const prototype = {
+  constructor,
+  child,
+  bindings,
+  setBindings,
+  flush,
+  isLevelEnabled,
+  version,
+  get level () { return this[getLevelSym]() },
+  set level (lvl) { this[setLevelSym](lvl) },
+  get levelVal () { return this[levelValSym] },
+  set levelVal (n) { throw Error('levelVal is read-only') },
+  get msgPrefix () { return this[msgPrefixSym] },
+  get [Symbol.toStringTag] () { return 'Pino' },
+  [lsCacheSym]: initialLsCache,
+  [writeSym]: write,
+  [asJsonSym]: asJson,
+  [getLevelSym]: getLevel,
+  [setLevelSym]: setLevel
+}
+
+Object.setPrototypeOf(prototype, EventEmitter.prototype)
+
+// exporting and consuming the prototype object using factory pattern fixes scoping issues with getters when serializing
+module.exports = function () {
+  return Object.create(prototype)
+}
+
+const resetChildingsFormatter = bindings => bindings
+function child (bindings, options) {
+  if (!bindings) {
+    throw Error('missing bindings for child Pino')
+  }
+  const serializers = this[serializersSym]
+  const formatters = this[formattersSym]
+  const instance = Object.create(this)
+
+  // If an `options` object was not supplied, we can improve
+  // the performance of child creation by skipping
+  // the checks for set options and simply return
+  // a baseline instance.
+  if (options == null) {
+    if (instance[formattersSym].bindings !== resetChildingsFormatter) {
+      instance[formattersSym] = buildFormatters(
+        formatters.level,
+        resetChildingsFormatter,
+        formatters.log
+      )
+    }
+
+    instance[chindingsSym] = asChindings(instance, bindings)
+
+    // Always call setLevel to ensure child gets own method references
+    // This prevents issues when parent methods are wrapped (e.g., by Sinon)
+    instance[setLevelSym](this.level)
+
+    if (this.onChild !== noop) {
+      this.onChild(instance)
+    }
+
+    return instance
+  }
+
+  if (options.hasOwnProperty('serializers') === true) {
+    instance[serializersSym] = Object.create(null)
+
+    for (const k in serializers) {
+      instance[serializersSym][k] = serializers[k]
+    }
+    const parentSymbols = Object.getOwnPropertySymbols(serializers)
+    /* eslint no-var: off */
+    for (var i = 0; i < parentSymbols.length; i++) {
+      const ks = parentSymbols[i]
+      instance[serializersSym][ks] = serializers[ks]
+    }
+
+    for (const bk in options.serializers) {
+      instance[serializersSym][bk] = options.serializers[bk]
+    }
+    const bindingsSymbols = Object.getOwnPropertySymbols(options.serializers)
+    for (var bi = 0; bi < bindingsSymbols.length; bi++) {
+      const bks = bindingsSymbols[bi]
+      instance[serializersSym][bks] = options.serializers[bks]
+    }
+  } else instance[serializersSym] = serializers
+  if (options.hasOwnProperty('formatters')) {
+    const { level, bindings: chindings, log } = options.formatters
+    instance[formattersSym] = buildFormatters(
+      level || formatters.level,
+      chindings || resetChildingsFormatter,
+      log || formatters.log
+    )
+  } else {
+    instance[formattersSym] = buildFormatters(
+      formatters.level,
+      resetChildingsFormatter,
+      formatters.log
+    )
+  }
+  if (options.hasOwnProperty('customLevels') === true) {
+    assertNoLevelCollisions(this.levels, options.customLevels)
+    instance.levels = mappings(options.customLevels, instance[useOnlyCustomLevelsSym])
+    genLsCache(instance)
+  }
+
+  // redact must place before asChindings and only replace if exist
+  if ((typeof options.redact === 'object' && options.redact !== null) || Array.isArray(options.redact)) {
+    instance.redact = options.redact // replace redact directly
+    const stringifiers = redaction(instance.redact, stringify)
+    const formatOpts = { stringify: stringifiers[redactFmtSym] }
+    instance[stringifySym] = stringify
+    instance[stringifiersSym] = stringifiers
+    instance[formatOptsSym] = formatOpts
+  }
+
+  if (typeof options.msgPrefix === 'string') {
+    instance[msgPrefixSym] = (this[msgPrefixSym] || '') + options.msgPrefix
+  }
+
+  instance[chindingsSym] = asChindings(instance, bindings)
+  const childLevel = options.level || this.level
+  instance[setLevelSym](childLevel)
+  this.onChild(instance)
+  return instance
+}
+
+function bindings () {
+  const chindings = this[chindingsSym]
+  const chindingsJson = `{${chindings.substr(1)}}` // at least contains ,"pid":7068,"hostname":"myMac"
+  const bindingsFromJson = JSON.parse(chindingsJson)
+  delete bindingsFromJson.pid
+  delete bindingsFromJson.hostname
+  return bindingsFromJson
+}
+
+function setBindings (newBindings) {
+  const chindings = asChindings(this, newBindings)
+  this[chindingsSym] = chindings
+  delete this[parsedChindingsSym]
+}
+
+/**
+ * Default strategy for creating `mergeObject` from arguments and the result from `mixin()`.
+ * Fields from `mergeObject` have higher priority in this strategy.
+ *
+ * @param {Object} mergeObject The object a user has supplied to the logging function.
+ * @param {Object} mixinObject The result of the `mixin` method.
+ * @return {Object}
+ */
+function defaultMixinMergeStrategy (mergeObject, mixinObject) {
+  return Object.assign(mixinObject, mergeObject)
+}
+
+function write (_obj, msg, num) {
+  const t = this[timeSym]()
+  const mixin = this[mixinSym]
+  const errorKey = this[errorKeySym]
+  const messageKey = this[messageKeySym]
+  const mixinMergeStrategy = this[mixinMergeStrategySym] || defaultMixinMergeStrategy
+  let obj
+  const streamWriteHook = this[hooksSym].streamWrite
+
+  if (_obj === undefined || _obj === null) {
+    obj = {}
+  } else if (_obj instanceof Error) {
+    obj = { [errorKey]: _obj }
+    if (msg === undefined) {
+      msg = _obj.message
+    }
+  } else {
+    obj = _obj
+    if (msg === undefined && _obj[messageKey] === undefined && _obj[errorKey]) {
+      msg = _obj[errorKey].message
+    }
+  }
+
+  if (mixin) {
+    obj = mixinMergeStrategy(obj, mixin(obj, num, this))
+  }
+
+  const s = this[asJsonSym](obj, msg, num, t)
+
+  const stream = this[streamSym]
+  if (stream[needsMetadataGsym] === true) {
+    stream.lastLevel = num
+    stream.lastObj = obj
+    stream.lastMsg = msg
+    stream.lastTime = t.slice(this[timeSliceIndexSym])
+    stream.lastLogger = this // for child loggers
+  }
+  stream.write(streamWriteHook ? streamWriteHook(s) : s)
+}
+
+function flush (cb) {
+  if (cb != null && typeof cb !== 'function') {
+    throw Error('callback must be a function')
+  }
+
+  const stream = this[streamSym]
+
+  if (typeof stream.flush === 'function') {
+    stream.flush(cb || noop)
+  } else if (cb) cb()
+}