fake logger for tests

logger.js

const LOG_LEVELS = {
  DEBUG: 1000,
  INFO: 2000,
  WARN: 3000,
  ERROR: 4000,
  NONE: 5000
}

export function makeFakeLogger (log_level_override) {
  const level = log_level_override || process.env.LOGGING_LEVEL || 'NONE'
  const log_level = LOG_LEVELS[level] || LOG_LEVELS.DEBUG
  const null_logger = () => {}

  return {
    debug: log_level > LOG_LEVELS.DEBUG ? null_logger : console.debug,
    info: log_level > LOG_LEVELS.INFO ? null_logger : console.info,
    log: log_level > LOG_LEVELS.INFO ? null_logger : console.log,
    warn: log_level > LOG_LEVELS.WARN ? null_logger : console.warn,
    error: log_level > LOG_LEVELS.ERROR ? null_logger : console.error
  }
}

// More advanced logger:
export const logger_factory = ({ prefix_args = [], log_level = LOG_LEVELS.DEBUG } = {}) => {
  const null_logger = () => {}

  const config = (args = {}) => logger_factory({
    prefix_args: [...prefix_args, ...(args.curry_args || [])],
    log_level: args.log_level || log_level,
  })

  return {
    debug: (...log_args) => log_level > LOG_LEVELS.DEBUG ? null_logger : console.debug("[DEBUG] ", ...prefix_args, ...log_args),
    info: (...log_args) => log_level > LOG_LEVELS.INFO ? null_logger : console.info("[INFO] ", ...prefix_args, ...log_args),
    warn: (...log_args) => log_level > LOG_LEVELS.WARN ? null_logger : console.warn("[WARN] ", ...prefix_args, ...log_args),
    error: (...log_args) => log_level > LOG_LEVELS.ERROR ? null_logger : console.error("[ERROR] ", ...prefix_args, ...log_args),
    curry: (...curry_args) => config({ curry_args }),
    level: (log_level) => config({ log_level }),
    config,
  }
}