brolog/src/config.ts

Npmlog like logger for Browser

export { VERSION } from './version.js'

/**
 * BROLOG_LEVEL
 */

const DEFAULT_LEVEL = 'info'
const BROLOG_LEVEL_VAR_NAME = 'BROLOG_LEVEL'
const BROLOG_PREFIX_VAR_NAME = 'BROLOG_PREFIX'

let level: undefined | string
let debugModule: undefined | string

/**
 *
 * Sometimes there's a `process` in browser (ionic3 & angular5)
 * Sometimes there's a window in Node.js (browserify)
 *
 */
// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
if (typeof process !== 'undefined' && process['env']) {
  /**
   * Node.js
   */
  if (!level) {
    level = process.env[BROLOG_LEVEL_VAR_NAME]
  }
  if (!debugModule) {
    debugModule = process.env[BROLOG_PREFIX_VAR_NAME]
  }
}

// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
if (typeof window !== 'undefined' && typeof window?.location?.search === 'string') {
  /**
   * Browser
   */
  if (!level) {
    level = getJsonFromUrl()[BROLOG_LEVEL_VAR_NAME]
  }
  if (!debugModule) {
    debugModule = getJsonFromUrl()[BROLOG_LEVEL_VAR_NAME]
  }
}

function getJsonFromUrl () {
  // https://stackoverflow.com/questions/8486099/how-do-i-parse-a-url-query-parameters-in-javascript
  const query = location.search.substr(1)
  const result = {} as { [idx: string]: string }
  query.split('&').forEach(function (part) {
    const [key, val] = part.split('=')
    if (typeof key !== 'undefined' && typeof val !== 'undefined') {
      result[key] = decodeURIComponent(val)
    }
  })
  return result
}

export const BROLOG_LEVEL = level || DEFAULT_LEVEL
export const BROLOG_PREFIX = debugModule || '*'