@8select/strulo/lib/es6/message.js.flow

Log messages in a structured format.

// @flow

import { getLevelName } from './log-levels'
import type { LogLevel, LogLevelName } from './log-levels'

export type Message = string | Object

type LogMessage = {
  message: Message,
  level: LogLevel,
  level_name: LogLevelName,
  time: number,
}

export const formatMessage = (level: LogLevel, message: Message): string => {
  const logMessage: LogMessage = {
    message,
    level,
    level_name: getLevelName(level),
    time: Date.now(),
  }

  return JSON.stringify(logMessage)
}