0.8.1

Fixes #9

.editorconfig

@@ -1,4 +1,3 @@
-# EditorConfig helps developers define and maintain consistent coding styles between different editors and IDEs
 # editorconfig.org
 
 root = true
@@ -7,7 +6,6 @@ root = true
 indent_style = space
 indent_size = 2
 
-# We recommend you to keep these unchanged
 end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true

.gitignore

@@ -20,7 +20,7 @@ coverage
 # nyc test coverage
 .nyc_output
 
-# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
 .grunt
 
 # Bower dependency directory (https://bower.io/)
@@ -29,14 +29,14 @@ bower_components
 # node-waf configuration
 .lock-wscript
 
-# Compiled binary addons (http://nodejs.org/api/addons.html)
+# Compiled binary addons (https://nodejs.org/api/addons.html)
 build/Release
 
 # Dependency directories
 node_modules/
 jspm_packages/
 
-# Typescript v1 declaration files
+# TypeScript v1 declaration files
 typings/
 
 # Optional npm cache directory
@@ -57,6 +57,29 @@ typings/
 # dotenv environment variables file
 .env
 
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# next.js build output
+.next
+
+# nuxt.js build output
+.nuxt
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+#DynamoDB Local files
+.dynamodb/
+
+########## end of https://github.com/github/gitignore/blob/master/Node.gitignore
+
 # ignore ide files
 .idea
 .vscode
@@ -65,4 +88,4 @@ typings/
 lib
 
 # ignore docs
-docs
+docs

.gitlab-ci.yml

@@ -1,9 +1,8 @@
-image: node:lts-alpine
+image: registry.gitlab.com/openstapps/projectmanagement/node
 
 cache:
   key: ${CI_COMMIT_REF_SLUG}
   paths:
-    - lib
     - node_modules
 
 before_script:
@@ -18,8 +17,13 @@ build:
   stage: build
   script:
     - npm run build
+  artifacts:
+    paths:
+      - lib
 
 test:
+  variables:
+    FORCE_COLOR: '1' # see https://github.com/chalk/chalk/issues/203
   stage: test
   script:
     - npm test
@@ -27,6 +31,36 @@ test:
     paths:
       - coverage
 
+audit:
+  stage: test
+  script:
+    - npm audit
+  except:
+    - schedules
+  allow_failure: true
+
+scheduled-audit:
+  stage: test
+  script:
+    - npm audit
+  only:
+    - schedules
+
+package:
+  dependencies:
+    - build
+  tags:
+    - secrecy
+  stage: deploy
+  script:
+    - echo "//registry.npmjs.org/:_authToken=$NPM_AUTH_TOKEN" > ~/.npmrc
+    - npm publish
+  only:
+    - /^v[0-9]+.[0-9]+.[0-9]+$/
+  artifacts:
+    paths:
+      - lib
+
 pages:
   stage: deploy
   script:
@@ -36,4 +70,4 @@ pages:
     - /^v[0-9]+\.[0-9]+\.[0-9]+$/
   artifacts:
     paths:
-    - public
+      - public

.npmignore

@@ -1,10 +1,9 @@
 # Ignore all files/folders by default
 # See https://stackoverflow.com/a/29932318
 /*
-
-# Execept this files/folders
-!docs
+# Except these files/folders
 !lib
+lib/tsconfig.tsbuildinfo
 !LICENSE
 !package.json
 !package-lock.json

CHANGELOG.md

@@ -1,3 +1,73 @@
+# [0.8.0](https://gitlab.com/openstapps/logger/compare/v0.7.0...v0.8.0) (2021-12-14)
+
+
+
+# [0.7.0](https://gitlab.com/openstapps/logger/compare/v0.6.0...v0.7.0) (2021-05-18)
+
+
+
+# [0.6.0](https://gitlab.com/openstapps/logger/compare/v0.4.0...v0.6.0) (2021-04-06)
+
+
+### Bug Fixes
+
+* log level exclusiveness calculation ([100b921](https://gitlab.com/openstapps/logger/commit/100b921488c3b8846678bf72befb787ca51bd1c7))
+
+
+### Features
+
+* add EXIT log level ([edc6e6f](https://gitlab.com/openstapps/logger/commit/edc6e6fad5ece784059e406dcedd6d76fe07f74b))
+
+
+
+# [0.4.0](https://gitlab.com/openstapps/logger/compare/v0.3.1...v0.4.0) (2019-07-12)
+
+
+### Features
+
+* add transformations ([ddbe00d](https://gitlab.com/openstapps/logger/commit/ddbe00d2a51430348fcf4e4e29807cc43a37cf49)), closes [#9](https://gitlab.com/openstapps/logger/issues/9)
+
+
+
+## [0.3.1](https://gitlab.com/openstapps/logger/compare/v0.3.0...v0.3.1) (2019-06-05)
+
+
+### Bug Fixes
+
+* correct meta information for imports ([d2cb99f](https://gitlab.com/openstapps/logger/commit/d2cb99f70f713029550d8e535abfa65961486006))
+
+
+
+# [0.3.0](https://gitlab.com/openstapps/logger/compare/v0.2.1...v0.3.0) (2019-06-04)
+
+
+
+## [0.2.1](https://gitlab.com/openstapps/logger/compare/v0.2.0...v0.2.1) (2019-05-27)
+
+
+
+# [0.2.0](https://gitlab.com/openstapps/logger/compare/v0.1.0...v0.2.0) (2019-05-27)
+
+
+### Features
+
+* add automatic publishing ([d9c4ce4](https://gitlab.com/openstapps/logger/commit/d9c4ce48dc980f85d43be47a23b5eda73f9f21b1)), closes [#6](https://gitlab.com/openstapps/logger/issues/6)
+
+
+
+# [0.1.0](https://gitlab.com/openstapps/logger/compare/v0.0.5...v0.1.0) (2019-05-07)
+
+
+
+## [0.0.5](https://gitlab.com/openstapps/logger/compare/v0.0.4...v0.0.5) (2019-01-16)
+
+
+### Features
+
+* allow env variables to overwrite smtp config ([3d82c94](https://gitlab.com/openstapps/logger/commit/3d82c94577ad2013124fab64fc13ce24df579d21)), closes [#3](https://gitlab.com/openstapps/logger/issues/3)
+
+
+
 ## [0.0.4](https://gitlab.com/openstapps/logger/compare/v0.0.3...v0.0.4) (2018-11-28)
 
 
@@ -10,12 +80,12 @@
 
 
 
-## [0.0.1](https://gitlab.com/openstapps/logger/compare/911d71c...v0.0.1) (2018-11-28)
+## [0.0.1](https://gitlab.com/openstapps/logger/compare/911d71cf3b453dfe302c33d275cb840086288e8e...v0.0.1) (2018-11-28)
 
 
 ### Features
 
-* add logger ([911d71c](https://gitlab.com/openstapps/logger/commit/911d71c))
+* add logger ([911d71c](https://gitlab.com/openstapps/logger/commit/911d71cf3b453dfe302c33d275cb840086288e8e))
 
 
 

README.md

@@ -3,11 +3,12 @@
 [![pipeline status](https://gitlab.com/openstapps/logger/badges/master/pipeline.svg)](https://gitlab.com/openstapps/logger/commits/master)
 [![coverage report](https://gitlab.com/openstapps/logger/badges/master/coverage.svg)](https://gitlab.com/openstapps/logger/commits/master)
 
-This is a simple logger for TypeScript projects with colors for console output.
+This is a simple logger for TypeScript projects with transformations for the log output.
 
 Logs are only printed if their log level is equal or higher than the defined log level.
 
 ## Log Levels
+
 Available log levels are:
 - 1 - INFO
 - 2 - LOG
@@ -24,16 +25,21 @@ For example `STAPPS_LOG_LEVEL=17` is 16 + 1 and would log everything that is `OK
 If you want to use logger in production (`NODE_ENV=production`) and allow all transports to fail set
 `ALLOW_NO_TRANSPORT` to `true`.
 
+Additionally setting the environment variable `STAPPS_EXIT_LEVEL` which works in the same manner as `STAPPS_LOG_LEVEL` will terminate your process after logging at the selected level(s) (usefull for integration tests). It will be ignored in afore mentioned productive environments.
+
 ## SMTP
+
 This class also provides a simple implementation of an SMTP transport which can be used as a
 `TransportWithVerification` for the logger. You can use this to transport errors of the logger or to transport mails
 of your own monitoring solution.
 
 ### Usage
+
 You can instatiate it with a config or it will check for a config in the environment variables. Environment variables
 can overwrite the actual config values.
 
 Environment variables are:
+
 * SMTP_AUTH_USER:      SMTP username
 * SMTP_AUTH_PASSWORD:  SMTP password
 * SMTP_HOST:           SMTP host
@@ -43,3 +49,15 @@ Environment variables are:
 * SMTP_SENDER_MAIL:    sender of the mail
 * SMTP_SENDER_NAME:    name of the sender
 * SMTP_SECURE:         `true` to enable tls
+
+## Transformations
+
+By default the logger will only add the log level to the message.
+
+You can change this behavior by setting other Transformers via `Logger.setTransformations`. If you do so, mind the order of the transformers.
+
+You may choose from the following:
+
+* `AddLogLevel`, which prepends the output with the log level
+* `Colorize`, which colorizes the output according to the log level
+* `Timestamp`, which prepends a timestamp to the output

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@openstapps/logger",
-  "version": "0.0.5",
+  "version": "0.8.1",
   "description": "A cli logger with colors, loglevels and the possibility to use a transport system for errors",
   "repository": {
     "type": "git",
@@ -8,61 +8,78 @@
   },
   "license": "GPL-3.0-only",
   "scripts": {
-    "build": "npm run tslint && npm run compile && npm run documentation",
-    "changelog": "conventional-changelog -p angular -i CHANGELOG.md -s -r 0",
-    "compile": "tsc",
-    "documentation": "typedoc --includeDeclarations --excludeExternals --mode modules --out docs src",
-    "prepareOnly": "npm run build",
-    "test": "nyc mocha --require ts-node/register --ui mocha-typescript 'test/*.ts'",
-    "tslint": "tslint 'src/**/*.ts'"
+    "build": "npm run tslint && npm run compile",
+    "changelog": "conventional-changelog -p angular -i CHANGELOG.md -s -r 0 && git add CHANGELOG.md && git commit -m 'docs: update changelog'",
+    "check-configuration": "openstapps-configuration",
+    "compile": "rimraf lib && tsc && prepend lib/cli.js '#!/usr/bin/env node\n'",
+    "documentation": "typedoc --name \"@openstapps/logger\" --includeVersion --out docs --readme README.md --listInvalidSymbolLinks --entryPointStrategy expand src",
+    "postversion": "npm run changelog",
+    "prepublishOnly": "npm ci && npm run build",
+    "preversion": "npm run prepublishOnly",
+    "push": "git push && git push origin \"v$npm_package_version\"",
+    "test": "nyc mocha --require ts-node/register --ui mocha-typescript 'test/**/*.spec.ts'",
+    "tslint": "tslint -p tsconfig.json -c tslint.json 'src/**/*.ts'"
   },
   "author": "Karl-Philipp Wulfert <krlwlfrt@gmail.com>",
   "contributors": [
     "Anselm Stordeur <anselmstordeur@gmail.com>",
-    "Jovan Krunic <jovan.krunic@gmail.com>"
+    "Jovan Krunic <jovan.krunic@gmail.com>",
+    "Rainer Killinger <mail-openstapps@killinger.co>"
   ],
-  "typings": "./lib/Logger.d.ts",
-  "main": "./lib/Logger.js",
+  "typings": "./lib/logger.d.ts",
+  "main": "./lib/logger.js",
   "nyc": {
+    "all": true,
+    "branches": 95,
     "check-coverage": true,
-    "per-file": true,
-    "lines": 0,
-    "statements": 0,
-    "functions": 0,
-    "branches": 0,
-    "include": [
-      "src"
+    "exclude": [
+      "src/smtp.ts",
+      "src/cli.ts"
     ],
     "extension": [
       ".ts"
     ],
+    "functions": 95,
+    "include": [
+      "src"
+    ],
+    "lines": 95,
+    "per-file": true,
     "reporter": [
       "html",
       "text-summary"
     ],
-    "all": true
+    "require": [
+      "ts-node/register"
+    ],
+    "statements": 95
   },
   "devDependencies": {
-    "@openstapps/configuration": "0.5.0",
-    "@types/chai": "4.1.7",
-    "@types/mocha": "5.2.5",
-    "@types/sinon": "7.0.3",
-    "chai": "4.2.0",
-    "conventional-changelog-cli": "2.0.11",
-    "mocha": "5.2.0",
+    "@openstapps/configuration": "0.29.0",
+    "@types/chai": "4.3.1",
+    "@types/chai-as-promised": "7.1.5",
+    "@types/chai-spies": "1.0.3",
+    "@types/mocha": "9.1.1",
+    "chai": "4.3.6",
+    "chai-as-promised": "7.1.1",
+    "chai-spies": "1.0.0",
+    "conventional-changelog-cli": "2.2.2",
+    "mocha": "9.1.3",
     "mocha-typescript": "1.1.17",
-    "nyc": "13.1.0",
-    "sinon": "7.2.2",
-    "ts-node": "7.0.1",
-    "tslint": "5.12.0",
-    "typedoc": "0.14.0",
-    "typescript": "3.2.2"
+    "nyc": "15.1.0",
+    "prepend-file-cli": "1.0.6",
+    "rimraf": "3.0.2",
+    "ts-node": "10.8.0",
+    "tslint": "6.1.3",
+    "typedoc": "0.22.15",
+    "typescript": "4.4.4"
   },
   "dependencies": {
-    "@types/circular-json": "0.4.0",
-    "@types/node": "10.12.18",
-    "@types/nodemailer": "4.6.5",
-    "circular-json": "0.5.9",
-    "nodemailer": "5.1.1"
+    "@types/node": "14.18.18",
+    "@types/nodemailer": "6.4.4",
+    "chalk": "4.1.2",
+    "flatted": "3.2.5",
+    "moment": "2.29.3",
+    "nodemailer": "6.7.5"
   }
 }

src/Logger.ts

@@ -1,351 +0,0 @@
-/*
- * Copyright (C) 2018 StApps
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation, version 3.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program. If not, see <https://www.gnu.org/licenses/>.
- */
-import {stringify} from 'circular-json';
-import {Transport, TransportWithVerification} from './Transport';
-
-/**
- * Logger with colors, loglevel and transport
- *
- * Log level can be defined by setting the environment variable STAPPS_LOG_LEVEL to a valid log level. Log levels are
- * set in a binary way. For example STAPPS_LOG_LEVEL=12 does result in logs only for `Logger.warn` and `Logger.error`.
- *
- * Log levels in that order are:
- * ```
- * 1 - INFO
- * 2 - LOG
- * 4 - WARN
- * 8 - ERROR
- * 16 - OK
- * ```
- */
-export class Logger {
-
-  /*
-   * Reset = "\x1b[0m"
-   * Bright = "\x1b[1m"
-   * Dim = "\x1b[2m"
-   * Underscore = "\x1b[4m"
-   * Blink = "\x1b[5m"
-   * Reverse = "\x1b[7m"
-   * Hidden = "\x1b[8m"
-   *
-   * FgBlack = "\x1b[30m"
-   * FgRed = "\x1b[31m"
-   * FgGreen = "\x1b[32m"
-   * FgYellow = "\x1b[33m"
-   * FgBlue = "\x1b[34m"
-   * FgMagenta = "\x1b[35m"
-   * FgCyan = "\x1b[36m"
-   * FgWhite = "\x1b[37m"
-   *
-   * BgBlack = "\x1b[40m"
-   * BgRed = "\x1b[41m"
-   * BgGreen = "\x1b[42m"
-   * BgYellow = "\x1b[43m"
-   * BgBlue = "\x1b[44m"
-   * BgMagenta = "\x1b[45m"
-   * BgCyan = "\x1b[46m"
-   * BgWhite = "\x1b[47m"
-   */
-
-  /**
-   * Prefix for cyan color
-   */
-  private cyan = '\x1b[36m';
-
-  /**
-   * Prefix for green color
-   */
-  private green = '\x1b[32m';
-
-  /**
-   * Set to true if this code is executed by Node.js
-   */
-  private isNode: boolean;
-
-  /**
-   * Set to true if the environment for a productive environment is given
-   *
-   * In Node.js this means that `NODE_ENV` is set to `production`
-   */
-  private isProductiveEnvironment: boolean;
-
-  /**
-   * Log levels
-   */
-  private logLevels: { [logLevel: string]: 1 | 2 | 4 | 8 | 16 } = {
-    'INFO': 1,
-    'LOG': 2,
-    'WARN': 4,
-    // tslint:disable-next-line:object-literal-sort-keys
-    'ERROR': 8,
-    'OK': 16,
-  };
-
-  /**
-   * Prefix for red color
-   */
-  private red = '\x1b[31m';
-
-  /**
-   * Suffix to end a color
-   */
-  private reset = '\x1b[0m';
-
-  /**
-   * Transport for errors
-   *
-   * For example `@stapps/smtp-transport`
-   */
-  private transport?: Transport;
-
-  /**
-   * Prefix for white color
-   */
-  private white = '\x1b[37m';
-
-  /**
-   * Prefix for yellow color
-   */
-  private yellow = '\x1b[33m';
-
-  /**
-   * Checks if this code is executed in Node.js
-   */
-  public static isNodeEnvironment(): boolean {
-    // Only Node.js has a process variable that is of [[Class]] process
-    return Object.prototype.toString.call(typeof process !== 'undefined' ? process : 0) === '[object process]';
-  }
-
-  /**
-   * Checks if a productive environment is given
-   */
-  public static isProductiveEnvironment(): boolean {
-    return Logger.isNodeEnvironment &&
-      (typeof process.env.NODE_ENV === 'string' && process.env.NODE_ENV === 'production');
-  }
-
-  /**
-   * Instatiate an instance of logger
-   * @param transport A transport instance that can be used for error transport
-   */
-  constructor(transport?: Transport) {
-    // node environment -> maybe we run a service which needs monitoring
-    if (Logger.isNodeEnvironment()) {
-      this.isNode = true;
-
-      // check if we are in productive environment -> then we need to run a transport
-      if (Logger.isProductiveEnvironment()) {
-        this.isProductiveEnvironment = true;
-
-        if (typeof transport === 'undefined') {
-          if (process.env.ALLOW_NO_TRANSPORT !== 'true') {
-            throw new Error('Productive environment doesn\'t set an transport agent for error notifications');
-          } else {
-            this.warn('Productive environment doesn\'t set an transport agent for error notifications');
-          }
-        } else {
-
-          this.transport = transport;
-
-          // we expect an transport for error notifications
-          if (this.isTransportWithVerification(transport) && !transport.isVerified()) {
-            transport.verify().then((success) => {
-              if (typeof success === 'string') {
-                this.ok(success);
-              } else {
-                this.ok('Successfully verified transport for error notification');
-              }
-            }).catch((err) => {
-              throw err;
-            });
-          }
-        }
-      } else {
-        this.isProductiveEnvironment = false;
-      }
-    } else {
-      this.isProductiveEnvironment = false;
-      this.isNode = false;
-    }
-  }
-
-  /**
-   * Check if intended log level is allowed in environment log level
-   *
-   * @param logLevel
-   * @returns {boolean}
-   */
-  private checkLogLevel(logLevel: 1 | 2 | 4 | 8 | 16) {
-
-    const requiredLogLevel = this.getLogLevel();
-
-    if (requiredLogLevel > 31 || requiredLogLevel < 0) {
-      throw new Error('Log level is out of range.');
-    }
-
-    // tslint:disable-next-line:no-bitwise
-    return requiredLogLevel & logLevel;
-  }
-
-  /**
-   * Return log level from environment
-   * @returns {number}
-   */
-  private getLogLevel(): number {
-    if (this.isNode && typeof process.env.STAPPS_LOG_LEVEL === 'string') {
-      // Node.js environment exists
-      return parseInt(process.env.STAPPS_LOG_LEVEL, 10);
-    } else if (typeof window !== 'undefined' && typeof (window as any).STAPPS_LOG_LEVEL === 'number') {
-      // browser environment exists
-      return (window as any).STAPPS_LOG_LEVEL;
-    }
-
-    // Log everything
-    return 31;
-  }
-
-  private isTransportWithVerification(transport: Transport): transport is TransportWithVerification {
-    return typeof (transport as any).verify === 'function';
-  }
-
-  /**
-   * Stringify a list of arguments
-   *
-   * @param args {any[]} Arguments to stringify
-   * @returns {string} Stringified arguments
-   */
-  private stringifyArguments(..._args: any[]): string {
-    const result: string[] = [];
-
-    /* tslint:disable:prefer-for-of */
-    for (let idx = 0; idx < arguments.length; idx++) {
-      /* tslint:enable */
-      const argument = arguments[idx];
-      const type = typeof argument;
-
-      if (['string', 'number'].indexOf(type) !== -1) {
-        result.push(argument);
-      } else if (argument instanceof Error) {
-        result.push(argument.message);
-        if (typeof argument.stack !== 'undefined') {
-          result.push(argument.stack);
-        }
-      } else {
-        result.push(stringify(argument, null, 2));
-      }
-    }
-
-    return result.join(', ');
-  }
-
-  /**
-   * Log with level ERROR
-   *
-   * @param args {any} Arguments to log
-   */
-  public error(...args: any[]): void {
-    if (this.checkLogLevel(this.logLevels.ERROR)) {
-      if (this.isNode) {
-        /* tslint:disable-next-line:no-console */
-        console.error(this.red + '[ERROR] ' + this.stringifyArguments(...args) + this.reset);
-
-        if (this.isProductiveEnvironment) {
-
-          if (typeof this.transport === 'undefined') {
-            if (process.env.ALLOW_NO_TRANSPORT !== 'true') {
-              throw new Error('Error couldn\'t be tranported. Please set an transport or set ALLOW_NO_TRANSPORT=true');
-            }
-          } else {
-            this.transport.send('Error', this.stringifyArguments(...args)).catch((err) => {
-              throw err;
-            });
-          }
-        }
-      } else {
-        /* tslint:disable-next-line:no-console */
-        console.log('[ERROR] ' + this.stringifyArguments(...args));
-      }
-    }
-  }
-
-  /**
-   * Log with level INFO
-   *
-   * @param args {any} Arguments to log
-   */
-  public info(...args: any[]): void {
-    if (this.checkLogLevel(this.logLevels.INFO)) {
-      if (this.isNode) {
-        /* tslint:disable-next-line:no-console */
-        console.info(this.cyan + '[INFO] ' + this.stringifyArguments(...args) + this.reset);
-      } else {
-        /* tslint:disable-next-line:no-console */
-        console.info('[INFO] ' + this.stringifyArguments(...args));
-      }
-    }
-  }
-
-  /**
-   * Log with level LOG
-   *
-   * @param args {any} Arguments to log
-   */
-  public log(...args: any[]): void {
-    if (this.checkLogLevel(this.logLevels.LOG)) {
-      if (this.isNode) {
-        /* tslint:disable-next-line:no-console */
-        console.log(this.white + '[LOG] ' + this.stringifyArguments(...args) + this.reset);
-      } else {
-        /* tslint:disable-next-line:no-console */
-        console.log('[LOG] ' + this.stringifyArguments(...args));
-      }
-    }
-  }
-
-  /**
-   * Log with level OK
-   *
-   * @param args {any} Arguments to log
-   */
-  public ok(...args: any[]): void {
-    if (this.checkLogLevel(this.logLevels.OK)) {
-      if (this.isNode) {
-        /* tslint:disable-next-line:no-console */
-        console.log(this.green + '[OK] ' + this.stringifyArguments(...args) + this.reset);
-      } else {
-        /* tslint:disable-next-line:no-console */
-        console.log('[OK] ' + this.stringifyArguments(...args));
-      }
-    }
-  }
-
-  /**
-   * Log with level WARN
-   *
-   * @param args {any} Arguments to log
-   */
-  public warn(...args: any[]): void {
-    if (this.checkLogLevel(this.logLevels.WARN)) {
-      if (this.isNode) {
-        /* tslint:disable-next-line:no-console */
-        console.warn(this.yellow + '[WARN] ' + this.stringifyArguments(...args) + this.reset);
-      } else {
-        /* tslint:disable-next-line:no-console */
-        console.warn('[WARN] ' + this.stringifyArguments(...args));
-      }
-    }
-  }
-}

src/common.ts

@@ -12,38 +12,79 @@
  * You should have received a copy of the GNU General Public License along with
  * this program. If not, see <https://www.gnu.org/licenses/>.
  */
+import {Transport, VerifiableTransport} from './transport';
 
- /**
-  * A recursive partial object
-  *
-  * Copied from https://stackoverflow.com/a/51365037
-  */
+/**
+ * A recursive partial object
+ *
+ * Copied from https://stackoverflow.com/a/51365037
+ */
 export type RecursivePartial<T> = {
   [P in keyof T]?: T[P] extends Array<infer U> ?
-  Array<RecursivePartial<U>> :
-  T[P] extends object ? RecursivePartial<T[P]> : T[P];
+    Array<RecursivePartial<U>> :
+    T[P] extends object ? RecursivePartial<T[P]> : T[P];
 };
 
 /**
  * Deletes all properties that are undefined from an object
- * @param obj
+ *
+ * @param obj Object to delete undefined properties from
  */
-export function deleteUndefinedProperties(obj: any) {
+export function deleteUndefinedProperties(obj: unknown): unknown {
   // return atomic data types and arrays (recursion anchor)
   if (typeof obj !== 'object' || Array.isArray(obj)) {
     return obj;
   }
 
   // check each key
-  Object.keys(obj).forEach((key) => {
-    if (typeof obj[key] === 'undefined') {
+  for (const key in obj) {
+    /* istanbul ignore if */
+    if (!obj.hasOwnProperty(key)) {
+      continue;
+    }
+
+    const indexedObj = obj as { [k: string]: unknown; };
+
+    if (typeof indexedObj[key] === 'undefined') {
       // delete undefined keys
-      delete obj[key];
+      delete indexedObj[key];
     } else {
       // check recursive
-      obj[key] = deleteUndefinedProperties(obj[key]);
+      indexedObj[key] = deleteUndefinedProperties(indexedObj[key]);
     }
-  });
+  }
 
   return obj;
 }
+
+/**
+ * Checks if environment is Node.js
+ */
+export function isNodeEnvironment(): boolean {
+  return Object.prototype.toString.call(typeof process !== 'undefined' ? process : 0) === '[object process]';
+}
+
+/**
+ * Checks if environment is productive
+ */
+export function isProductiveEnvironment(): boolean {
+  return typeof process.env === 'object'
+    && typeof process.env.NODE_ENV !== 'undefined'
+    && process.env.NODE_ENV === 'production';
+}
+
+/**
+ * Checks if environment is Node.js and productive
+ */
+export function isProductiveNodeEnvironment(): boolean {
+  return isNodeEnvironment() && isProductiveEnvironment();
+}
+
+/**
+ * Check if a transport is a verifiable transport
+ *
+ * @param transport Transport to check
+ */
+export function isTransportWithVerification(transport: Transport): transport is VerifiableTransport {
+  return transport instanceof VerifiableTransport;
+}

src/logger.ts

@@ -0,0 +1,345 @@
+/*
+ * Copyright (C) 2019-2020 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import {stringify} from 'flatted';
+import {isNodeEnvironment, isProductiveNodeEnvironment} from './common';
+import {Transformation} from './transformation';
+import {AddLogLevel} from './transformations/add-log-level';
+import {Transport} from './transport';
+
+/**
+ * Check if something has property STAPPS_LOG_LEVEL
+ *
+ * @param something Something to check
+ */
+// tslint:disable-next-line:completed-docs
+function hasStAppsLogLevel(something: object): something is { STAPPS_LOG_LEVEL: number; } {
+  return 'STAPPS_LOG_LEVEL' in something;
+}
+
+/**
+ * Check if something has property STAPPS_EXIT_LEVEL
+ *
+ * @param something Something to check
+ */
+// tslint:disable-next-line:completed-docs
+function hasStAppsExitLevel(something: object): something is { STAPPS_EXIT_LEVEL: number; } {
+  return 'STAPPS_EXIT_LEVEL' in something;
+}
+
+/**
+ * A level descriptor for either log or exit level
+ */
+export type Level = 'LOG' | 'EXIT';
+
+/**
+ * A log level
+ */
+export type LogLevel = 'INFO' | 'LOG' | 'WARN' | 'ERROR' | 'OK';
+
+/**
+ * A logger with transports and transformations
+ *
+ * Log level can be defined by setting the environment variable STAPPS_LOG_LEVEL to a valid log level. Log levels are
+ * set in a binary way. For example STAPPS_LOG_LEVEL=12 does result in logs only for `Logger.warn` and `Logger.error`.
+ *
+ * Log levels in that order are:
+ * ```
+ * INFO: 1
+ * LOG: 2
+ * WARN: 4
+ * ERROR: 8
+ * OK: 16
+ * ```
+ */
+export class Logger {
+  /**
+   * Base of binary system
+   */
+  private static readonly binaryBase = 2;
+
+  /**
+   * Log levels
+   */
+  private static readonly logLevels: LogLevel[] = [
+    'INFO',
+    'LOG',
+    'WARN',
+    'ERROR',
+    'OK',
+  ];
+
+  /**
+   * Log level sum, equivalent to all log levels enabled
+   */
+  private static readonly logLevelSum = Math.pow(Logger.binaryBase, Logger.logLevels.length) - 1;
+
+  /**
+   * Transformers for log output
+   */
+  private static transformations?: Transformation[] = [
+    new AddLogLevel(),
+  ];
+
+  /**
+   * Transport for errors
+   */
+  private static transport?: Transport;
+
+  /**
+   * Apply transformations to an output
+   *
+   * @param logLevel Log level of the output
+   * @param output Output to apply transformations to
+   */
+  private static applyTransformers(logLevel: LogLevel, output: string): string {
+    if (!Array.isArray(Logger.transformations) || Logger.transformations.length === 0) {
+      return output;
+    }
+
+    let transformedOutput = output;
+    for (const transformation of Logger.transformations) {
+      transformedOutput = transformation.transform(logLevel, transformedOutput);
+    }
+
+    return transformedOutput;
+  }
+
+  /**
+   * Check if intended exit level is allowed in environment exit level
+   *
+   * @param exitLevel Log level to check
+   */
+  private static checkExitLevel(exitLevel: LogLevel): boolean {
+    if (Logger.getLevel('EXIT') === 0) {
+      return false;
+    }
+
+    // tslint:disable-next-line:no-bitwise
+    return (Logger.getLevel('EXIT') & Logger.logLevelNumber(exitLevel)) === Logger.logLevelNumber(exitLevel);
+  }
+
+  /**
+   * Check if intended log level is allowed in environment log level
+   *
+   * @param logLevel Log level to check
+   */
+  private static checkLogLevel(logLevel: LogLevel): boolean {
+    // tslint:disable-next-line:no-bitwise
+    return (Logger.getLevel('LOG') & Logger.logLevelNumber(logLevel)) === Logger.logLevelNumber(logLevel);
+  }
+
+  /**
+   * Notify about exit and end process
+   */
+  private static exit(): void {
+    if (isProductiveNodeEnvironment()) {
+      return;
+    }
+    // tslint:disable-next-line: no-console
+    console.error(Logger.applyTransformers('ERROR', `exiting as of used exit level ${Logger.getLevel('EXIT')} !`));
+    process.exit(-1);
+  }
+
+  /**
+   * Return log level from environment
+   */
+  private static getLevel(level: Level): number {
+    if (typeof window !== 'undefined') {
+      // browser environment exists
+      if (hasStAppsLogLevel(window)) {
+        return window.STAPPS_LOG_LEVEL;
+      }
+
+      if (hasStAppsExitLevel(window)) {
+        return window.STAPPS_EXIT_LEVEL;
+      }
+    }
+
+    const environmentLevel = level === 'LOG' ? process.env.STAPPS_LOG_LEVEL : process.env.STAPPS_EXIT_LEVEL;
+
+    if (isNodeEnvironment() && typeof environmentLevel !== 'undefined') {
+      // Node.js environment exists
+      return parseInt(environmentLevel, 10);
+    }
+
+    // Fallback to log everything, or not exiting
+    switch (level) {
+      case 'LOG':
+        return Logger.logLevelSum;
+      case 'EXIT':
+        return 0;
+    }
+  }
+
+  /**
+   * Get number of specific log level
+   *
+   * @param logLevel Log level to check
+   */
+  private static logLevelNumber(logLevel: LogLevel): number {
+    return Math.pow(Logger.binaryBase, Logger.logLevels.indexOf(logLevel));
+  }
+
+  /**
+   * Log an error
+   *
+   * @param args Arguments to log
+   */
+  public static async error(...args: unknown[]): Promise<string | void> {
+    if (!Logger.checkLogLevel('ERROR')) {
+      return;
+    }
+
+    /* tslint:disable-next-line:no-console */
+    console.error(Logger.applyTransformers('ERROR', Logger.stringifyArguments(...args)));
+
+    if (isProductiveNodeEnvironment()) {
+      if (typeof Logger.transport !== 'undefined') {
+        return Logger.transport.send('Error', Logger.stringifyArguments(...args));
+      }
+
+      if (process.env.ALLOW_NO_TRANSPORT !== 'true') {
+        throw new Error(`Error couldn't be transported! Please set a transport or set ALLOW_NO_TRANSPORT='true'.`);
+      }
+    }
+    if (Logger.checkExitLevel('ERROR')) {
+      Logger.exit();
+    }
+  }
+
+  /**
+   * Log an information
+   *
+   * @param args Arguments to log
+   */
+  public static info(...args: unknown[]): void {
+    if (!Logger.checkLogLevel('INFO')) {
+      return;
+    }
+
+    /* tslint:disable-next-line:no-console */
+    console.info(Logger.applyTransformers('INFO', Logger.stringifyArguments(...args)));
+    if (Logger.checkExitLevel('INFO')) {
+      Logger.exit();
+    }
+  }
+
+  /**
+   * Check if the logger is initialized correctly
+   */
+  public static initialized(): void {
+    if (isProductiveNodeEnvironment() && typeof Logger.transport === 'undefined') {
+      if (process.env.ALLOW_NO_TRANSPORT !== 'true') {
+        throw new Error(`Productive environment doesn't set a transport for error notifications.`);
+      }
+
+      Logger.warn(`Productive environment doesn't set a transport for error notifications.`);
+    }
+  }
+
+  /**
+   * Log something
+   *
+   * @param args Arguments to log
+   */
+  public static log(...args: unknown[]): void {
+    if (!Logger.checkLogLevel('LOG')) {
+      return;
+    }
+
+    /* tslint:disable-next-line:no-console */
+    console.log(Logger.applyTransformers('LOG', Logger.stringifyArguments(...args)));
+    if (Logger.checkExitLevel('LOG')) {
+      Logger.exit();
+    }
+  }
+
+  /**
+   * Log something successful
+   *
+   * @param args Arguments to log
+   */
+  public static ok(...args: unknown[]): void {
+    if (!Logger.checkLogLevel('OK')) {
+      return;
+    }
+
+    /* tslint:disable-next-line:no-console */
+    console.log(Logger.applyTransformers('OK', Logger.stringifyArguments(...args)));
+    if (Logger.checkExitLevel('OK')) {
+      Logger.exit();
+    }
+  }
+
+  /**
+   * Set transformations for log output
+   *
+   * @param transformations List of transformations
+   */
+  public static setTransformations(transformations: Transformation[]) {
+    Logger.transformations = transformations;
+  }
+
+  /**
+   * Set a transport
+   *
+   * @param transport Transport to set
+   */
+  public static setTransport(transport?: Transport) {
+    Logger.transport = transport;
+  }
+
+  /**
+   * Stringify a list of arguments
+   *
+   * @param args Arguments to stringify
+   */
+  public static stringifyArguments(...args: unknown[]): string {
+    const result: string[] = [];
+
+    args.forEach((argument) => {
+      if (typeof argument === 'string' || typeof argument === 'number') {
+        result.push(argument.toString());
+      } else if (argument instanceof Error) {
+        result.push(argument.message);
+        if (typeof argument.stack !== 'undefined') {
+          result.push(argument.stack);
+        }
+      } else {
+        // tslint:disable-next-line:no-magic-numbers
+        result.push(stringify(argument, null, 2));
+      }
+    });
+
+    return result.join(', ');
+  }
+
+  /**
+   * Log a warning
+   *
+   * @param args Arguments to log
+   */
+  public static warn(...args: unknown[]): void {
+    if (!Logger.checkLogLevel('WARN')) {
+      return;
+    }
+
+    /* tslint:disable-next-line:no-console */
+    console.warn(Logger.applyTransformers('WARN', Logger.stringifyArguments(...args)));
+    if (Logger.checkExitLevel('WARN')) {
+      Logger.exit();
+    }
+  }
+}

src/smtp.ts

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2019 StApps
  * This program is free software: you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
  * Software Foundation, version 3.
@@ -14,25 +14,57 @@
  */
 import * as nodemailer from 'nodemailer';
 import {MailOptions} from 'nodemailer/lib/sendmail-transport';
-import {deleteUndefinedProperties, RecursivePartial} from './common';
-import {Logger} from './Logger';
-import {TransportWithVerification} from './Transport';
+import {deleteUndefinedProperties, isProductiveEnvironment, RecursivePartial} from './common';
+import {VerifiableTransport} from './transport';
 
 /**
  * A configuration of the transport used to send mails via SMTP
  */
 export interface SMTPConfig {
+  /**
+   * Auth configuration
+   */
   auth: {
+    /**
+     * Password for login
+     */
     password: string;
+    /**
+     * User for login
+     */
     user: string;
   };
+  /**
+   * List of "carbon copy" recipients
+   */
   cc?: string[];
+  /**
+   * SMTP host server
+   */
   host: string;
+  /**
+   * SMTP port
+   */
   port: number;
+  /**
+   * List of recipients
+   */
   recipients: string[];
+  /**
+   * Whether or not to establish a secure connection
+   */
   secure?: boolean;
+  /**
+   * Sender configuration
+   */
   sender: {
+    /**
+     * Mail of sender
+     */
     mail: string;
+    /**
+     * Name of sender
+     */
     name?: string;
   };
 }
@@ -40,32 +72,40 @@ export interface SMTPConfig {
 /**
  * An implementation of mail transport via SMTP
  */
-export class SMTP extends TransportWithVerification {
-
+export class SMTP extends VerifiableTransport {
+  /**
+   * Singleton instance
+   */
   private static _instance: SMTP;
 
   /**
    * List of all mail addresses to send in cc
    */
-  private cc: string[];
+  private readonly cc: string[];
 
   /**
    * Who is using this service
    */
-  private from: {
+  private readonly from: {
+    /**
+     * Mail of sender
+     */
     mail: string;
+    /**
+     * Name of sender
+     */
     name?: string;
   };
 
   /**
    * List of all mail addresses to send to
    */
-  private recipients: string[];
+  private readonly recipients: string[];
 
   /**
    * Connection to SMTP server
    */
-  private transportAgent: nodemailer.Transporter;
+  private readonly transportAgent: nodemailer.Transporter;
 
   /**
    * Set to true if the transport was verified
@@ -85,30 +125,31 @@ export class SMTP extends TransportWithVerification {
    * SMTP_SENDER_MAIL:    sender of the mail
    * SMTP_SENDER_NAME:    name of the sender
    * SMTP_SECURE:         `true` to enable tls
-   * @param config {SMTPConfig}
-   * @return {Transport}
+   *
+   * @param config SMTP config for instance
    */
   public static getInstance(config?: SMTPConfig): SMTP | undefined {
     // if an instance of SMTP already exists
-    if (this._instance) {
-      return this._instance;
+    if (typeof SMTP._instance !== 'undefined') {
+      return SMTP._instance;
     }
 
     // monitoring is not required -> SMTP init can fail
-    if (!Logger.isProductiveEnvironment() || process.env.ALLOW_NO_TRANSPORT === 'true') {
+    if (!isProductiveEnvironment() || process.env.ALLOW_NO_TRANSPORT === 'true') {
       try {
-        this._instance = new this(config);
+        SMTP._instance = new SMTP(config);
       } catch (err) {
         /* tslint:disable-next-line:no-console */
         console.warn('SMTP config failed.');
+
         return;
       }
     } else {
       // monitoring is required -> SMTP will throw error if config is invalid
-      this._instance = new this(config);
+      SMTP._instance = new SMTP(config);
     }
 
-    return this._instance;
+    return SMTP._instance;
   }
 
   /**
@@ -118,100 +159,94 @@ export class SMTP extends TransportWithVerification {
    * For more information please consider reading
    * https://stackoverflow.com/a/2071250
    *
-   * @param {string} address
-   * @return {boolean}
+   * @param address Address to validate
    */
   public static isValidEmailAddress(address: string): boolean {
-
-    if (typeof address !== 'string') {
-      return false;
-    }
-
     // tslint:disable-next-line:max-line-length
-    const regex = /^(([^<>()\[\]\.,;:\s@\"]+(\.[^<>()\[\]\.,;:\s@\"]+)*)|(\".+\"))@(([^<>()[\]\.,;:\s@\"]+\.)+[^<>()[\]\.,;:\s@\"]{2,})$/i;
-    return regex.test(address);
+    return /^(([^<>()\[\].,;:\s@"]+(\.[^<>()\[\].,;:\s@"]+)*)|(".+"))@(([^<>()[\].,;:\s@"]+\.)+[^<>()[\].,;:\s@"]{2,})$/i.test(address);
   }
 
   /**
-   * Checks a list of mail addresses for validity.
-   * @param {string[]} recipients
-   * @return {string[]}
+   * Checks a list of mail addresses for validity
+   *
+   * @param recipients List of recipients to check
    */
   public static isValidRecipientsList(recipients: string[] | undefined): boolean {
-    return Array.isArray(recipients) && recipients.length > 0 && recipients.every(this.isValidEmailAddress);
+    return Array.isArray(recipients) && recipients.length > 0 && recipients.every(SMTP.isValidEmailAddress);
   }
 
   /**
-   * Creates an SMTP connection. WARNING: This class is supposed to be used as a singleton. You should never
-   * call `new SMTP()`
-   * @param {SMTPConfig} config
+   * Creates an SMTP connection.
+   *
+   * WARNING: This class is supposed to be used as a singleton. You should never call `new SMTP()`
+   *
+   * @param smtpConfig SMTP config
    */
-  private constructor(config?: SMTPConfig) {
+  private constructor(smtpConfig?: SMTPConfig) {
     // create a partial config from environment variables that can overwrite the given config
     const envConfig: RecursivePartial<SMTPConfig> = {
       auth: {
         password: process.env.SMTP_AUTH_PASSWORD,
         user: process.env.SMTP_AUTH_USER,
       },
-      cc: ((typeof process.env.SMTP_CC === 'string') ? (process.env.SMTP_CC as string).split(',') : []),
+      cc: ((typeof process.env.SMTP_CC !== 'undefined') ? (process.env.SMTP_CC as string).split(',') : []),
       host: process.env.SMTP_HOST,
-      port: (typeof process.env.SMTP_PORT === 'string') ? parseInt(process.env.SMTP_PORT, 10) : undefined,
-      recipients: (typeof process.env.SMTP_RECIPIENTS === 'string') ?
+      port: (typeof process.env.SMTP_PORT !== 'undefined') ? parseInt(process.env.SMTP_PORT, 10) : undefined,
+      recipients: (typeof process.env.SMTP_RECIPIENTS !== 'undefined') ?
         (process.env.SMTP_RECIPIENTS).split(',') :
         [],
-      secure: (typeof process.env.SMTP_SECURE === 'string') ? (process.env.SMTP_SECURE === 'true') : false,
+      secure: (typeof process.env.SMTP_SECURE !== 'undefined') ? (process.env.SMTP_SECURE === 'true') : false,
       sender: {
         mail: process.env.SMTP_SENDER_MAIL,
         name: process.env.SMTP_SENDER_NAME,
       },
     };
 
-    // @ts-ignore
-    config = {
-      ...config,
+    const config = {
+      ...smtpConfig,
       // deleting undefined properties so the actual config doesn't get overwritten by undefined values
-      ...deleteUndefinedProperties(envConfig),
-    };
+      ...(deleteUndefinedProperties(envConfig) as object),
+    } as SMTPConfig;
 
-    if (typeof config!.host !== 'string') {
+    if (typeof config.host === 'undefined') {
       throw new Error(
         'SMTP configuration needs a host. Add it to the config or use environment variables (SMTP_HOST).',
       );
     }
 
-    if (typeof config!.port !== 'number' || isNaN(config!.port)) {
+    if (typeof config.port === 'undefined' || isNaN(config.port)) {
       throw new Error(
         'SMTP configuration needs a port. Add it to the config or use environment variables (SMTP_PORT).',
       );
     }
 
-    if (typeof config!.auth !== 'object') {
+    if (typeof config.auth !== 'object') {
       throw new Error(
         'SMTP configuration needs an auth object.' +
         'Add it to the config or use environment variables (SMTP_AUTH_USER, SMTP_AUTH_PASSWORD).',
       );
     }
 
-    if (typeof config!.auth.user !== 'string') {
+    if (typeof config.auth.user === 'undefined') {
       throw new Error(
         'SMTP auth configuration needs a user. Add it to the config or use environment variables (SMTP_AUTH_USER).',
       );
     }
 
-    if (typeof config!.auth.password !== 'string') {
+    if (typeof config.auth.password === 'undefined') {
       throw new Error(
         'SMTP auth configuration needs a password.' +
         'Add it to the config or use environment variables (SMTP_AUTH_PASSWORD).',
       );
     }
 
-    if (Array.isArray(config!.recipients) && config!.recipients.length < 1) {
+    if (Array.isArray(config.recipients) && config.recipients.length < 1) {
       throw new Error(
         'SMTP configuration needs recipients. Add it to the config or use environment variables (SMTP_RECIPIENTS).',
       );
     }
 
-    if (typeof config!.sender.mail !== 'string') {
+    if (typeof config.sender.mail === 'undefined') {
       throw new Error(
         'SMTP configuration needs a sender. Add it to the config or use environment variables (SMTP_SENDER_MAIL).',
       );
@@ -219,15 +254,15 @@ export class SMTP extends TransportWithVerification {
 
     super();
 
-    if (SMTP.isValidRecipientsList(config!.recipients)) {
-      this.recipients = config!.recipients;
+    if (SMTP.isValidRecipientsList(config.recipients)) {
+      this.recipients = config.recipients;
     } else {
       throw new Error('Invalid recipients found');
     }
 
-    if (typeof config!.cc !== 'undefined') {
-      if (SMTP.isValidRecipientsList(config!.cc)) {
-        this.cc = config!.cc!;
+    if (typeof config.cc !== 'undefined') {
+      if (SMTP.isValidRecipientsList(config.cc)) {
+        this.cc = config.cc;
       } else {
         throw new Error('Invalid cc recipients found');
       }
@@ -235,25 +270,24 @@ export class SMTP extends TransportWithVerification {
       this.cc = [];
     }
 
-    this.from = config!.sender;
+    this.from = config.sender;
 
     this.verified = false;
 
     // creating transport with configuration
     this.transportAgent = nodemailer.createTransport({
       auth: {
-        pass: config!.auth.password,
-        user: config!.auth.user,
+        pass: config.auth.password,
+        user: config.auth.user,
       },
-      host: config!.host,
-      port: config!.port,
-      secure: typeof config!.secure === 'boolean' ? config!.secure : false,
+      host: config.host,
+      port: config.port,
+      secure: typeof config.secure !== 'undefined' ? config.secure : false,
     });
   }
 
   /**
    * Check if instance was verified at least once
-   * @returns {boolean}
    */
   public isVerified(): boolean {
     return this.verified;
@@ -262,11 +296,12 @@ export class SMTP extends TransportWithVerification {
   /**
    * Sends a preconfigured mail with recipients and sender configured on
    * creation of the class (set by environment or on creation of this class)
-   * @param {string} subject
-   * @param {string} message
+   *
+   * @param subject Subject of the mail
+   * @param message message of the mail
    */
   public async send(subject: string, message: string): Promise<string> {
-    return await this.sendMail({
+    return this.sendMail({
       cc: this.cc,
       // use an address block if name is available, mail otherwise
       from: (typeof this.from.name !== 'string') ? `${this.from.name} <${this.from.mail}>` : this.from.mail,
@@ -278,7 +313,8 @@ export class SMTP extends TransportWithVerification {
 
   /**
    * Sends a mail object
-   * @param {MailOptions} mail
+   *
+   * @param mail Mail to send
    */
   public async sendMail(mail: MailOptions): Promise<string> {
     // info is the response of the smtp server
@@ -306,35 +342,36 @@ export class SMTP extends TransportWithVerification {
    */
   public async verify(): Promise<boolean> {
 
-    let verificationSuccessfull: boolean = false;
+    let verificationSuccessfull = false;
 
     try {
       verificationSuccessfull = await this.transportAgent.verify();
     } catch (err) {
-      if (!Logger.isProductiveEnvironment() || process.env.ALLOW_NO_TRANSPORT !== 'true') {
+      if (!isProductiveEnvironment() || process.env.ALLOW_NO_TRANSPORT !== 'true') {
         throw err;
-      } else {
-        /* tslint:disable-next-line:no-console */
-        console.warn(
-          'SMTP verification error was ignored, because tranport failures are allowed: ',
-          err.message,
-        );
       }
+
+      /* tslint:disable-next-line:no-console */
+      console.warn(
+        'SMTP verification error was ignored, because tranport failures are allowed: ',
+        (err as Error).message,
+      );
     }
 
     if (!verificationSuccessfull) {
-      if (!Logger.isProductiveEnvironment() || process.env.ALLOW_NO_TRANSPORT !== 'true') {
+      if (!isProductiveEnvironment() || process.env.ALLOW_NO_TRANSPORT !== 'true') {
         throw new Error(
           'Verification of SMTP transport failed.' +
           'If you want to ignore this error set' +
           '`NODE_ENV=dev` or `ALLOW_NO_TRANSPORT=true`',
         );
-      } else {
-        /* tslint:disable-next-line:no-console */
-        console.warn('SMTP verification error was ignored, because tranport failures are allowed.');
       }
+
+      /* tslint:disable-next-line:no-console */
+      console.warn('SMTP verification error was ignored, because tranport failures are allowed.');
     }
     this.verified = verificationSuccessfull;
+
     return verificationSuccessfull;
   }
 }

src/transformation.ts

@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2019 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import {LogLevel} from './logger';
+
+/**
+ * A transformer for log output
+ */
+export interface Transformation {
+  /**
+   * Transform an output
+   *
+   * @param logLevel Log level to transform output for
+   * @param output Output to transform
+   */
+  transform(logLevel: LogLevel, output: string): string;
+}

src/transformations/add-log-level.ts

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2019 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import {LogLevel} from '../logger';
+import {Transformation} from '../transformation';
+
+/**
+ * Transformation that adds the log level to output
+ */
+export class AddLogLevel implements Transformation {
+  /**
+   * Add log level to output
+   *
+   * @param logLevel Log level to add to output
+   * @param output Output to colorize
+   */
+  // tslint:disable-next-line:prefer-function-over-method
+  transform(logLevel: LogLevel, output: string): string {
+    return `[${logLevel}] ${output}`;
+  }
+}

src/transformations/colorize.ts

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2019-2020 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import chalk, {Chalk} from 'chalk';
+import {LogLevel} from '../logger';
+import {Transformation} from '../transformation';
+
+/**
+ * Transformation that colorizes log output
+ */
+export class Colorize implements Transformation {
+  /**
+   * Instantiate a new colorize transformation
+   *
+   * @param logLevelToColor Map from log level to color transformation to apply
+   */
+  constructor(private readonly logLevelToColor: { [k in LogLevel]: Chalk; } = {
+    ERROR: chalk.bold.red,
+    INFO: chalk.cyan,
+    LOG: chalk.white,
+    OK: chalk.bold.green,
+    WARN: chalk.yellow,
+  }) {
+    // noop
+  }
+
+  /**
+   * Colorize log output
+   *
+   * @param logLevel Log level to choose color for
+   * @param output Output to colorize
+   */
+  transform(logLevel: LogLevel, output: string): string {
+    return this.logLevelToColor[logLevel](output);
+  }
+}

src/transformations/timestamp.ts

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2019 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import {LogLevel} from '../logger';
+import {Transformation} from '../transformation';
+/**
+ * Transformation that adds a timestamp to output
+ */
+export class Timestamp implements Transformation {
+  /**
+   * Instantiate a new timestamp transformation
+   *
+   * @see https://momentjs.com/docs/#/displaying/format/
+   *
+   * @param format Format for timestamps
+   */
+  constructor(private readonly format = 'LLLL') {
+    // noop
+  }
+
+  /**
+   * Add timestamp to output
+   *
+   * @param _logLevel Log level to add timestamp to output for
+   * @param output Output to add timestamp to
+   */
+  transform(_logLevel: LogLevel, output: string): string {
+    const moment = require('moment');
+    const now = moment();
+
+    return `[${now.format(this.format)}] ${output}`;
+  }
+}

src/transport.ts

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2019 StApps
  * This program is free software: you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
  * Software Foundation, version 3.
@@ -14,34 +14,33 @@
  */
 
 /**
- * An abstract wrapper for a transport system like for example smtp
+ * An abstract wrapper for a transport system like for example SMTP
  */
 export abstract class Transport {
-
   /**
-   * Send message with subject. A message can be a mail or something completly different. Depending on what Transport
-   * is implemented
-   * @param {string} subject
-   * @param {string} message
+   * Send message with subject
+   *
+   * A message can be a mail or something completely different depending on what transport is implemented.
+   *
+   * @param subject Subject of the message
+   * @param message Message to send
    */
   abstract send(subject: string, message: string): Promise<string>;
-
 }
 
 /**
- * A transport wrapper of transport which can be veriefied
+ * A transport wrapper of transport which can be verified
  */
-export abstract class TransportWithVerification extends Transport {
-
+export abstract class VerifiableTransport extends Transport {
   /**
    * Checks if the transport was verified at least once
-   * @returns {boolean}
    */
   abstract isVerified(): boolean;
 
   /**
-   * Verifies transport (check connection, authentication, ...)
+   * Verifies transport
+   *
+   * Check connection, authentication, ...
    */
   abstract verify(): Promise<boolean>;
-
 }

test/Logger.spec.ts

@@ -1,227 +0,0 @@
-/*
- * Copyright (C) 2018 StApps
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation, version 3.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program. If not, see <https://www.gnu.org/licenses/>.
- */
-import {expect} from 'chai';
-import {slow, suite, test, timeout} from 'mocha-typescript';
-import * as sinon from 'sinon';
-import {Logger} from '../src/Logger';
-
-const logger1 = new Logger();
-
-@suite(timeout(2000), slow(1000))
-export class LoggerSpec {
-
-  @test
-  error1(done: () => void) {
-    let
-      stub;
-    stub = sinon.stub(console, 'error');
-
-    logger1.error('Foobar');
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('[ERROR] Foobar');
-
-    done();
-  }
-
-  @test
-  error2(done: () => void) {
-    const e = new Error();
-    const stub = sinon.stub(console, 'error');
-
-    logger1.error(e);
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('Error').contains('at').contains(process.cwd());
-
-    done();
-  }
-
-  @test
-  info(done: () => void) {
-    let
-      stub;
-    stub = sinon.stub(console, 'info');
-
-    logger1.info('Foobar');
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('[INFO] Foobar');
-
-    done();
-  }
-
-  @test
-  log(done: () => void) {
-    let
-      stub;
-    stub = sinon.stub(console, 'log');
-
-    logger1.log('Foobar');
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('[LOG] Foobar');
-
-    done();
-  }
-
-  @test
-  logLevel1(done: () => void) {
-    let logStub;
-    let warnStub;
-
-    process.env.STAPPS_LOG_LEVEL = '8';
-
-    logStub = sinon.stub(console, 'log');
-    warnStub = sinon.stub(console, 'warn');
-
-    logger1.ok('foo');
-    logger1.warn('bar');
-
-    logStub.restore();
-
-    /* tslint:disable:no-unused-expression */
-    expect(logStub.called).to.be.false;
-    expect(warnStub.called).to.be.false;
-    /* tslint:enable */
-
-    delete process.env.STAPPS_LOG_LEVEL;
-
-    logger1.warn('bar');
-
-    /* tslint:disable:no-unused-expression */
-    expect(warnStub.called).to.be.true;
-    /* tslint:enable */
-
-    warnStub.restore();
-
-    done();
-  }
-
-  @test
-  logLevel2(done: () => void) {
-    let logStub;
-    let warnStub;
-
-    process.env.STAPPS_LOG_LEVEL = '12';
-
-    logStub = sinon.stub(console, 'log');
-    warnStub = sinon.stub(console, 'warn');
-
-    logger1.ok('foo');
-    logger1.warn('bar');
-
-    logStub.restore();
-
-    /* tslint:disable:no-unused-expression */
-    expect(logStub.called).to.be.false;
-    expect(warnStub.called).to.be.true;
-    /* tslint:enable */
-
-    delete process.env.STAPPS_LOG_LEVEL;
-
-    logger1.warn('bar');
-
-    /* tslint:disable:no-unused-expression */
-    expect(warnStub.called).to.be.true;
-    /* tslint:enable */
-
-    warnStub.restore();
-
-    done();
-  }
-
-  @test
-  logLevel3(done: () => void) {
-    let logStub;
-    let warnStub;
-
-    process.env.STAPPS_LOG_LEVEL = '20';
-
-    logStub = sinon.stub(console, 'log');
-    warnStub = sinon.stub(console, 'warn');
-
-    logger1.ok('foo');
-    logger1.warn('bar');
-
-    logStub.restore();
-
-    /* tslint:disable:no-unused-expression */
-    expect(logStub.called).to.be.true;
-    expect(warnStub.called).to.be.true;
-    /* tslint:enable */
-
-    delete process.env.STAPPS_LOG_LEVEL;
-
-    logger1.warn('bar');
-
-    /* tslint:disable:no-unused-expression */
-    expect(warnStub.called).to.be.true;
-    /* tslint:enable */
-
-    warnStub.restore();
-
-    done();
-  }
-
-  @test
-  ok(done: () => void) {
-    let
-      stub;
-    stub = sinon.stub(console, 'log');
-
-    logger1.ok('Foobar');
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('[OK] Foobar');
-
-    done();
-  }
-
-  @test
-  stringifyArguments(done: () => void) {
-    let
-      stub;
-    stub = sinon.stub(console, 'log');
-
-    logger1.log('foo', 'bar');
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('[LOG]').and.contains('foo').and.contains('bar');
-
-    done();
-  }
-
-  @test
-  warn(done: () => void) {
-    let
-      stub;
-    stub = sinon.stub(console, 'warn');
-
-    logger1.warn('Foobar');
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('[WARN] Foobar');
-
-    done();
-  }
-}

test/common.spec.ts

@@ -13,12 +13,16 @@
  * this program. If not, see <https://www.gnu.org/licenses/>.
  */
 import {expect} from 'chai';
-import {slow, suite, test, timeout} from 'mocha-typescript';
-import {deleteUndefinedProperties} from '../src/common';
+import {suite, test} from 'mocha-typescript';
+import {
+  deleteUndefinedProperties,
+  isNodeEnvironment,
+  isProductiveEnvironment,
+  isProductiveNodeEnvironment,
+} from '../src/common';
 
-@suite(timeout(2000), slow(1000))
+@suite()
 export class CommonSpec {
-  /* tslint:disable:member-ordering */
   @test
   deleteUndefinedProperties1() {
     expect(deleteUndefinedProperties(
@@ -67,4 +71,48 @@ export class CommonSpec {
       },
     );
   }
+
+  @test
+  isNodeEnvironment() {
+    expect(isNodeEnvironment()).to.be.equal(true);
+
+    const savedProcess = process;
+
+    // @ts-ignore
+    process = undefined;
+
+    expect(isNodeEnvironment()).to.be.equal(false);
+
+    process = savedProcess;
+  }
+
+  @test
+  isProductiveEnvironment() {
+    const nodeEnv = process.env.NODE_ENV;
+
+    process.env.NODE_ENV = '';
+
+    expect(isProductiveEnvironment()).to.be.equal(false);
+
+    process.env.NODE_ENV = 'production';
+
+    expect(isProductiveEnvironment()).to.be.equal(true);
+
+    process.env.NODE_ENV = nodeEnv;
+  }
+
+  @test
+  isProductiveNodeEnvironment() {
+    const nodeEnv = process.env.NODE_ENV;
+
+    process.env.NODE_ENV = '';
+
+    expect(isProductiveNodeEnvironment()).to.be.equal(false);
+
+    process.env.NODE_ENV = 'production';
+
+    expect(isProductiveNodeEnvironment()).to.be.equal(true);
+
+    process.env.NODE_ENV = nodeEnv;
+  }
 }

test/dummyTransport.ts

@@ -0,0 +1,35 @@
+import {Transport, VerifiableTransport} from '../src/transport';
+
+export class DummyTransport extends Transport {
+  send(subject: string, message: string): Promise<string> {
+    return new Promise((resolve, reject) => {
+      if (0 === 0) {
+        resolve(subject);
+      }
+
+      reject(message);
+    });
+  }
+}
+
+export class VerifiableDummyTransport extends VerifiableTransport {
+  isVerified(): boolean {
+    return false;
+  }
+
+  send(subject: string, message: string): Promise<string> {
+    return new Promise((resolve, reject) => {
+      if (0 === 0) {
+        resolve(subject);
+      }
+
+      reject(message);
+    });
+  }
+
+  verify(): Promise<boolean> {
+    return new Promise((resolve) => {
+      resolve(true);
+    });
+  }
+}

test/logger.spec.ts

@@ -0,0 +1,453 @@
+/*
+ * Copyright (C) 2018, 2020 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import chai from 'chai';
+import {expect} from 'chai';
+import chaiAsPromised from 'chai-as-promised';
+import chaiSpies from 'chai-spies';
+import {suite} from 'mocha-typescript';
+import {Logger} from '../src/logger';
+import {AddLogLevel} from '../src/transformations/add-log-level';
+import {DummyTransport} from './dummyTransport';
+
+chai.should();
+chai.use(chaiSpies);
+chai.use(chaiAsPromised);
+
+@suite()
+export class LoggerSpec {
+  static sandbox: ChaiSpies.Sandbox;
+
+  static before() {
+    LoggerSpec.sandbox = chai.spy.sandbox();
+  }
+
+  before() {
+    Logger.setTransformations([
+      new AddLogLevel(),
+    ]);
+  }
+
+  after() {
+    LoggerSpec.sandbox.restore();
+  }
+
+  @test
+  async 'default log level'() {
+    expect((Logger as any).getLevel('LOG')).to.be.equal(31);
+    expect((Logger as any).getLevel('EXIT')).to.be.equal(0);
+  }
+
+  @test
+  async error() {
+    const spy = LoggerSpec.sandbox.on(console, 'error', () => {
+      // noop
+    });
+
+    await Logger.error('Foobar');
+
+    expect(spy).to.have.been.called();
+    expect(spy.__spy.calls[0][0]).to.contain('[ERROR]');
+    expect(spy.__spy.calls[0][0]).to.contain('Foobar');
+  }
+
+  @test
+  async 'error in productive environment'() {
+    const spy = LoggerSpec.sandbox.on(console, 'error', () => {
+      // noop
+    });
+
+    const nodeEnv = process.env.NODE_ENV;
+    process.env.NODE_ENV = 'production';
+
+    await Logger.error('Foobar').should.be.rejectedWith(Error);
+    expect(spy).to.have.been.called.exactly(1);
+
+    process.env.ALLOW_NO_TRANSPORT = 'true';
+
+    await Logger.error('Foobar').should.not.be.rejectedWith(Error);
+    expect(spy).to.have.been.called.exactly(2);
+
+    delete process.env.ALLOW_NO_TRANSPORT;
+
+    Logger.setTransport(new DummyTransport());
+
+    await Logger.error('Foobar').should.not.be.rejectedWith(Error);
+    expect(spy).to.have.been.called.exactly(3);
+
+    Logger.setTransport();
+
+    process.env.NODE_ENV = nodeEnv;
+  }
+
+  @test
+  async 'error without output'() {
+    const spy = LoggerSpec.sandbox.on(console, 'error', () => {
+      // noop
+    });
+
+    process.env.STAPPS_LOG_LEVEL = '0';
+
+    await Logger.error('Foobar');
+
+    delete process.env.STAPPS_LOG_LEVEL;
+
+    expect(spy).not.to.have.been.called();
+  }
+
+  @test
+  async 'error with Error'() {
+    const spy = LoggerSpec.sandbox.on(console, 'error', () => {
+      // noop
+    });
+
+    await Logger.error(new Error());
+
+    expect(spy).to.have.been.called();
+    expect(spy.__spy.calls[0][0]).to.contain('Error');
+    expect(spy.__spy.calls[0][0]).to.contain(process.cwd());
+  }
+
+  @test
+  info() {
+    const spy = LoggerSpec.sandbox.on(console, 'info', () => {
+      // noop
+    });
+
+    Logger.info('Foobar');
+
+    expect(spy).to.have.been.called();
+    expect(spy.__spy.calls[0][0]).to.contain('[INFO]');
+    expect(spy.__spy.calls[0][0]).to.contain('Foobar');
+  }
+
+  @test
+  async exits() {
+    const infoSpy = LoggerSpec.sandbox.on(console, 'info', () => {
+      // noop
+    });
+    const logSpy = LoggerSpec.sandbox.on(console, 'log', () => {
+      // noop
+    });
+    const warnSpy = LoggerSpec.sandbox.on(console, 'warn', () => {
+      // noop
+    });
+    const errorSpy = LoggerSpec.sandbox.on(console, 'error', () => {
+      // noop
+    });
+    const processSpy = LoggerSpec.sandbox.on(process, 'exit', () => {
+      // noop
+    });
+
+    const exitLevel = process.env.STAPPS_EXIT_LEVEL;
+    process.env.STAPPS_EXIT_LEVEL = '31';
+
+    Logger.info('Foobar');
+    Logger.log('Foobar');
+    Logger.warn('Foobar');
+    Logger.ok('Foobar');
+    await Logger.error('Foobar');
+
+    expect(infoSpy).to.have.been.called.once;
+    expect(infoSpy.__spy.calls[0][0]).to.contain('[INFO]');
+    expect(infoSpy.__spy.calls[0][0]).to.contain('Foobar');
+
+    expect(logSpy).to.have.been.called.twice;
+
+    expect(warnSpy).to.have.been.called.once;
+    expect(warnSpy.__spy.calls[0][0]).to.contain('[WARN]');
+    expect(warnSpy.__spy.calls[0][0]).to.contain('Foobar');
+
+    expect(errorSpy).to.have.been.called.exactly(6);
+
+    expect(processSpy).to.have.been.called.exactly(5);
+
+    process.env.STAPPS_EXIT_LEVEL = exitLevel;
+  }
+
+  @test
+  'info without output'() {
+    const spy = LoggerSpec.sandbox.on(console, 'info', () => {
+      // noop
+    });
+
+    process.env.STAPPS_LOG_LEVEL = '0';
+
+    Logger.info('Foobar');
+
+    delete process.env.STAPPS_LOG_LEVEL;
+
+    expect(spy).not.to.have.been.called;
+  }
+
+  @test
+  initialized() {
+    Logger.setTransport(new DummyTransport());
+
+    expect(() => {
+      Logger.initialized();
+    }).not.to.throw();
+
+    Logger.setTransport();
+  }
+
+  @test
+  'initialized in productive environment'() {
+    const nodeEnv = process.env.NODE_ENV;
+    process.env.NODE_ENV = 'production';
+
+    Logger.setTransport(new DummyTransport());
+
+    expect(() => {
+      Logger.initialized();
+    }).not.to.throw();
+
+    Logger.setTransport();
+
+    expect(() => {
+      Logger.initialized();
+    }).to.throw();
+
+    const spy = LoggerSpec.sandbox.on(console, 'warn', () => {
+      // noop
+    });
+
+    process.env.ALLOW_NO_TRANSPORT = 'true';
+
+    expect(() => {
+      Logger.initialized();
+    }).not.to.throw();
+
+    delete process.env.ALLOW_NO_TRANSPORT;
+
+    expect(spy).to.have.been.called();
+
+    process.env.NODE_ENV = nodeEnv;
+  }
+
+  @test
+  log() {
+    const spy = LoggerSpec.sandbox.on(console, 'log', () => {
+      // noop
+    });
+
+    Logger.log('Foobar');
+
+    expect(spy).to.have.been.called();
+    expect(spy.__spy.calls[0][0]).to.contain('[LOG]');
+    expect(spy.__spy.calls[0][0]).to.contain('Foobar');
+  }
+
+  @test
+  'log without output'() {
+    const spy = LoggerSpec.sandbox.on(console, 'log', () => {
+      // noop
+    });
+
+    process.env.STAPPS_LOG_LEVEL = '0';
+
+    Logger.log('Foobar');
+
+    delete process.env.STAPPS_LOG_LEVEL;
+
+    expect(spy).to.not.have.been.called();
+  }
+
+  @test
+  ok() {
+    const spy = LoggerSpec.sandbox.on(console, 'log', () => {
+      // noop
+    });
+
+    Logger.ok('Foobar');
+
+    expect(spy).to.have.been.called();
+    expect(spy.__spy.calls[0][0]).to.contain('[OK]');
+    expect(spy.__spy.calls[0][0]).to.contain('Foobar');
+  }
+
+  @test
+  'ok without output'() {
+    const spy = LoggerSpec.sandbox.on(console, 'log', () => {
+      // noop
+    });
+
+    process.env.STAPPS_LOG_LEVEL = '0';
+
+    Logger.ok('Foobar');
+
+    delete process.env.STAPPS_LOG_LEVEL;
+
+    expect(spy).not.to.have.been.called();
+  }
+
+  @test
+  setTransport() {
+    expect(() => {
+      Logger.setTransport(new DummyTransport());
+      Logger.setTransport();
+    }).not.to.throw();
+  }
+
+  @test
+  'stringify'() {
+    const spy = LoggerSpec.sandbox.on(console, 'log', () => {
+      // noop
+    });
+
+    Logger.log('foo', 'bar');
+
+    expect(spy).to.have.been.called();
+    expect(spy.__spy.calls[0][0]).to.contain('foo');
+    expect(spy.__spy.calls[0][0]).to.contain('bar');
+  }
+
+  @test
+  'stringify object'() {
+    const spy = LoggerSpec.sandbox.on(console, 'log', () => {
+      // noop
+    });
+
+    Logger.log({
+      foo: 'bar',
+    });
+
+    expect(spy).to.have.been.called();
+    expect(spy.__spy.calls[0][0]).to.contain('foo');
+    expect(spy.__spy.calls[0][0]).to.contain('bar');
+  }
+
+  @test
+  warn() {
+    const spy = LoggerSpec.sandbox.on(console, 'warn', () => {
+      // noop
+    });
+
+    Logger.warn('Foobar');
+
+    expect(spy).to.have.been.called();
+    expect(spy.__spy.calls[0][0]).to.contain('[WARN]');
+    expect(spy.__spy.calls[0][0]).to.contain('Foobar');
+  }
+
+  @test
+  'warn without output'() {
+    const spy = LoggerSpec.sandbox.on(console, 'warn', () => {
+      // noop
+    });
+
+    process.env.STAPPS_LOG_LEVEL = '0';
+
+    Logger.warn('Foobar');
+
+    delete process.env.STAPPS_LOG_LEVEL;
+
+    expect(spy).not.to.have.been.called();
+  }
+
+  @test
+  'log level exclusiveness'() {
+    const warnSpy = LoggerSpec.sandbox.on(console, 'warn', () => {
+      // noop WARN
+    });
+    const infoSpy = LoggerSpec.sandbox.on(console, 'info', () => {
+      // noop INFO
+    });
+    const okSpy = LoggerSpec.sandbox.on(console, 'log', () => {
+      // noop OK
+    });
+
+    // only warn and info = warn + info = 4 + 1 = 5
+    process.env.STAPPS_LOG_LEVEL = '5';
+
+    Logger.warn('Foo');
+    Logger.info('Bar');
+    Logger.ok('Baz');
+
+    expect(warnSpy).to.have.been.called();
+    expect(warnSpy.__spy.calls[0][0]).to.contain('[WARN]');
+    expect(warnSpy.__spy.calls[0][0]).to.contain('Foo');
+
+    expect(infoSpy).to.have.been.called();
+    expect(infoSpy.__spy.calls[0][0]).to.contain('[INFO]');
+    expect(infoSpy.__spy.calls[0][0]).to.contain('Bar');
+
+    expect(okSpy).to.not.have.been.called();
+
+    delete process.env.STAPPS_LOG_LEVEL;
+  }
+
+  @test
+  getExitLevel() {
+    const savedProcess = process;
+
+    // @ts-ignore
+    process = undefined;
+
+    (global as any).window = {
+      STAPPS_EXIT_LEVEL: 0,
+    };
+
+    const stub = LoggerSpec.sandbox.on(console, 'info', () => {
+      // noop
+    });
+
+    Logger.info('Foobar');
+
+    process = savedProcess;
+
+    delete (global as any).window;
+
+    expect(stub).not.to.have.been.called();
+  }
+
+  @test
+  getLogLevel() {
+    const savedProcess = process;
+
+    // @ts-ignore
+    process = undefined;
+
+    (global as any).window = {
+      STAPPS_LOG_LEVEL: 0,
+    };
+
+    const stub = LoggerSpec.sandbox.on(console, 'info', () => {
+      // noop
+    });
+
+    Logger.info('Foobar');
+
+    process = savedProcess;
+
+    delete (global as any).window;
+
+    expect(stub).not.to.have.been.called();
+  }
+
+  @test
+  'output without transformations'() {
+    Logger.setTransformations([]);
+
+    const stub = LoggerSpec.sandbox.on(console, 'log', () => {
+      // noop
+    });
+    const applyTransformationsSpy = LoggerSpec.sandbox.on(Logger, 'applyTransformations');
+
+    Logger.log('Foobar');
+
+    expect(stub).to.have.been.called.with('Foobar');
+    expect(applyTransformationsSpy).not.to.have.been.called;
+  }
+}

test/smtp.spec.ts

@@ -13,12 +13,10 @@
  * this program. If not, see <https://www.gnu.org/licenses/>.
  */
 import {expect} from 'chai';
-import {slow, suite, test, timeout} from 'mocha-typescript';
-import {SMTP} from '../src/SMTP';
+import {suite, test} from 'mocha-typescript';
+import {SMTP} from '../src/smtp';
 
-// tslint:disable:no-unused-expression
-
-@suite(timeout(2000), slow(1000))
+@suite()
 export class SMTPSpec {
   /* tslint:disable:member-ordering */
   @test
@@ -105,5 +103,6 @@ export class SMTPSpec {
   mailValidation17() {
     expect(SMTP.isValidEmailAddress('stordeur@campus')).to.be.false;
   }
+
   /* tslint:enable:member-ordering */
 }

test/transformations/add-log-level.spec.ts

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2019 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import {expect} from 'chai';
+import {suite, test} from 'mocha-typescript';
+import {AddLogLevel} from '../../src/transformations/add-log-level';
+
+@suite()
+export class AddLogLevelSpec {
+  @test
+  'transform'() {
+    const transformation = new AddLogLevel();
+
+    expect(transformation.transform('ERROR', 'Foobar')).to.be.equal('[ERROR] Foobar');
+  }
+}

test/transformations/colorize.spec.ts

@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2019 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import {expect} from 'chai';
+import {suite, test} from 'mocha-typescript';
+import {Colorize} from '../../src/transformations/colorize';
+
+@suite()
+export class ColorizeSpec {
+  @test
+  'transform'() {
+    const transformation = new Colorize();
+
+    expect(transformation.transform('ERROR', 'Foobar')).to.be.equal('\u001b[1m\u001b[31mFoobar\u001b[39m\u001b[22m');
+    expect(transformation.transform('LOG', 'Foobar')).to.be.equal('\u001b[37mFoobar\u001b[39m');
+  }
+}

test/transformations/timestamp.spec.ts

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2019 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import {expect} from 'chai';
+import {suite, test} from 'mocha-typescript';
+import {Timestamp} from '../../src/transformations/timestamp';
+import moment = require('moment');
+
+@suite()
+export class ColorizeSpec {
+  @test
+  'default'() {
+    const transformation = new Timestamp();
+
+    expect(transformation.transform('ERROR', 'Foobar')).to.be.equal(`[${moment().format('LLLL')}] Foobar`);
+  }
+
+  @test
+  'different format'() {
+    const transformation = new Timestamp('DD.MM.YYYY');
+
+    expect(transformation.transform('ERROR', 'Foobar')).to.be.equal(`[${moment().format('DD.MM.YYYY')}] Foobar`);
+  }
+}

test/transport.spec.ts

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2019 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import {expect} from 'chai';
+import {suite, test} from 'mocha-typescript';
+import {isTransportWithVerification} from '../src/common';
+import {DummyTransport, VerifiableDummyTransport} from './dummyTransport';
+
+@suite()
+export class TransportSpec {
+  @test
+  isNotTransportWithVerification() {
+    return expect(isTransportWithVerification(new DummyTransport())).to.be.false;
+  }
+
+  @test
+  isTransportWithVerification() {
+    return expect(isTransportWithVerification(new VerifiableDummyTransport())).to.be.true;
+  }
+}

tsconfig.json

@@ -1,3 +1,3 @@
 {
   "extends": "./node_modules/@openstapps/configuration/tsconfig.json"
-}
+}

tslint.json

@@ -1,3 +1,6 @@
 {
-  "extends": "./node_modules/@openstapps/configuration/tslint.json"
+  "extends": "./node_modules/@openstapps/configuration/tslint.json",
+  "rules": {
+    "no-redundant-jsdoc": false
+  }
 }