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Viewing file:     err.js (1.28 KB)      -rw-r--r--

'use strict'

module.exports = errSerializer

const seen = Symbol('circular-ref-tag')
const rawSymbol = Symbol('pino-raw-err-ref')
const pinoErrProto = Object.create({}, {
  type: {
    enumerable: true,
    writable: true,
    value: undefined
  },
  message: {
    enumerable: true,
    writable: true,
    value: undefined
  },
  stack: {
    enumerable: true,
    writable: true,
    value: undefined
  },
  raw: {
    enumerable: false,
    get: function () {
      return this[rawSymbol]
    },
    set: function (val) {
      this[rawSymbol] = val
    }
  }
})
Object.defineProperty(pinoErrProto, rawSymbol, {
  writable: true,
  value: {}
})

function errSerializer (err) {
  if (!(err instanceof Error)) {
    return err
  }

  err[seen] = undefined // tag to prevent re-looking at this
  const _err = Object.create(pinoErrProto)
  _err.type = err.constructor.name
  _err.message = err.message
  _err.stack = err.stack
  for (const key in err) {
    if (_err[key] === undefined) {
      const val = err[key]
      if (val instanceof Error) {
        if (!val.hasOwnProperty(seen)) {
          _err[key] = errSerializer(val)
        }
      } else {
        _err[key] = val
      }
    }
  }

  delete err[seen] // clean up tag in case err is serialized again later
  _err.raw = err
  return _err
}