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'use strict'
module.exports = errSerializer
const { messageWithCauses, stackWithCauses, isErrorLike } = require('./err-helpers')
const { toString } = Object.prototype
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
},
aggregateErrors: {
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 (!isErrorLike(err)) {
return err
}
err[seen] = undefined // tag to prevent re-looking at this
const _err = Object.create(pinoErrProto)
_err.type = toString.call(err.constructor) === '[object Function]'
? err.constructor.name
: err.name
_err.message = messageWithCauses(err)
_err.stack = stackWithCauses(err)
if (Array.isArray(err.errors)) {
_err.aggregateErrors = err.errors.map(err => errSerializer(err))
}
for (const key in err) {
if (_err[key] === undefined) {
const val = err[key]
if (isErrorLike(val)) {
// We append cause messages and stacks to _err, therefore skipping causes here
if (key !== 'cause' && !Object.prototype.hasOwnProperty.call(val, 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
}