plugins simple.ts

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  import jsonStringify from 'safe-stable-stringify'
import { MESSAGE } from '../../triple-beam'
import format from '../format'
 
/*
 * function simple (info)
 * Returns a new instance of the simple format TransformStream
 * which writes a simple representation of logs.
 *
 *    const { level, message, splat, ...rest } = info;
 *
 *    ${level}: ${message}                            if rest is empty
 *    ${level}: ${message} ${JSON.stringify(rest)}    otherwise
 */
export default format((info) => {
  const stringifiedRest = jsonStringify({
    ...info,
    level: undefined,
    message: undefined,
    splat: undefined,
  })
 
  const padding = (info.padding && info.padding[info.level]) || ''
  if (stringifiedRest && stringifiedRest !== '{}') {
    info[MESSAGE] = `${info.level}:${padding} ${info.message} ${stringifiedRest}`
  }
  else {
    info[MESSAGE] = `${info.level}:${padding} ${info.message}`
  }
 
  return info
})