json.js•983 B
'use strict';
const format = require('./format');
const { MESSAGE } = require('triple-beam');
const stringify = require('safe-stable-stringify');
/*
* function replacer (key, value)
* Handles proper stringification of Buffer and bigint output.
*/
function replacer(key, value) {
// safe-stable-stringify does support BigInt, however, it doesn't wrap the value in quotes.
// Leading to a loss in fidelity if the resulting string is parsed.
// It would also be a breaking change for logform.
if (typeof value === 'bigint')
return value.toString();
return value;
}
/*
* function json (info)
* Returns a new instance of the JSON format that turns a log `info`
* object into pure JSON. This was previously exposed as { json: true }
* to transports in `winston < 3.0.0`.
*/
module.exports = format((info, opts) => {
const jsonStringify = stringify.configure(opts);
info[MESSAGE] = jsonStringify(info, opts.replacer || replacer, opts.space);
return info;
});