1.1.1

Fixes #9

.eslintignore

@@ -0,0 +1,2 @@
+resources
+openapi

.eslintrc.json

@@ -0,0 +1,3 @@
+{
+  "extends": "@openstapps"
+}

.gitlab-ci.yml

@@ -6,7 +6,7 @@ cache:
     - node_modules
 
 before_script:
-  - npm install
+  - npm ci
 
 stages:
   - build
@@ -22,12 +22,17 @@ build:
       - lib
 
 test:
+  variables:
+    FORCE_COLOR: '1' # see https://github.com/chalk/chalk/issues/203
   stage: test
   script:
     - npm test
+  coverage: '/Statements[^:]*\:[^:]*\s+([\d\.]+)%/'
   artifacts:
-    paths:
+    reports:
-      - coverage
+      coverage_report:
+        coverage_format: cobertura
+        path: coverage/cobertura-coverage.xml
 
 audit:
   stage: test

CHANGELOG.md

@@ -1,9 +1,78 @@
+# [1.1.0](https://gitlab.com/openstapps/logger/compare/v1.0.1...v1.1.0) (2022-11-01)
+
+
+### Bug Fixes
+
+* compatibility with log aggregators ([8aef5b8](https://gitlab.com/openstapps/logger/commit/8aef5b8d5b5fe4ed4ff7f17fd679ebdf83381001))
+
+
+
+## [1.0.1](https://gitlab.com/openstapps/logger/compare/v1.0.0...v1.0.1) (2022-10-12)
+
+
+
+# [1.0.0](https://gitlab.com/openstapps/logger/compare/v0.8.1...v1.0.0) (2022-08-17)
+
+
+
+## [0.8.1](https://gitlab.com/openstapps/logger/compare/v0.8.0...v0.8.1) (2022-05-27)
+
+
+
+# [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/d9c4ce4)), closes [#6](https://gitlab.com/openstapps/logger/issues/6)
+* add automatic publishing ([d9c4ce4](https://gitlab.com/openstapps/logger/commit/d9c4ce48dc980f85d43be47a23b5eda73f9f21b1)), closes [#6](https://gitlab.com/openstapps/logger/issues/6)
 
 
 
@@ -16,7 +85,7 @@
 
 ### Features
 
-* allow env variables to overwrite smtp config ([3d82c94](https://gitlab.com/openstapps/logger/commit/3d82c94)), closes [#3](https://gitlab.com/openstapps/logger/issues/3)
+* allow env variables to overwrite smtp config ([3d82c94](https://gitlab.com/openstapps/logger/commit/3d82c94577ad2013124fab64fc13ce24df579d21)), closes [#3](https://gitlab.com/openstapps/logger/issues/3)
 
 
 
@@ -32,12 +101,12 @@
 
 
 
-## [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
@@ -21,19 +22,23 @@ To select your desired log levels add the corresponding numbers and set the valu
 
 For example `STAPPS_LOG_LEVEL=17` is 16 + 1 and would log everything that is `OK` or `INFO`.
 
-If you want to use logger in production (`NODE_ENV=production`) and allow all transports to fail set
+If you want to use logger in production (`NODE_ENV=production`) and allow all transports to fail set `ALLOW_NO_TRANSPORT` to `true`.
-`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 +48,15 @@ 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. It will replace newlines with spaces and might skip some of your choosen Transformers when in production (`NODE_ENV=production`) for compatibility reasons with existing log aggregators and analyzers.
+
+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": "0.2.1",
+  "version": "1.1.1",
   "description": "A cli logger with colors, loglevels and the possibility to use a transport system for errors",
   "repository": {
     "type": "git",
@@ -8,28 +8,69 @@
   },
   "license": "GPL-3.0-only",
   "scripts": {
-    "build": "npm run tslint && npm run compile",
+    "build": "npm run lint && 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 --includeDeclarations --mode modules --out docs --readme README.md --listInvalidSymbolLinks src",
+    "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",
-    "test": "nyc mocha --require ts-node/register --ui mocha-typescript 'test/*.ts'",
+    "preversion": "npm run prepublishOnly",
-    "tslint": "tslint 'src/**/*.ts'"
+    "push": "git push && git push origin \"v$npm_package_version\"",
+    "test": "nyc mocha 'test/**/*.spec.ts'",
+    "lint": "eslint --ext .ts src/"
   },
   "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",
+  "typings": "./lib/logger.d.ts",
-  "main": "./lib/Logger.js",
+  "main": "./lib/logger.js",
+  "dependencies": {
+    "@types/node": "14.18.32",
+    "@types/nodemailer": "6.4.6",
+    "chalk": "4.1.2",
+    "flatted": "3.2.7",
+    "moment": "2.29.4",
+    "nodemailer": "6.8.0"
+  },
+  "devDependencies": {
+    "@openstapps/configuration": "0.33.0",
+    "@openstapps/eslint-config": "1.1.0",
+    "@testdeck/mocha": "0.3.0",
+    "@types/chai": "4.3.3",
+    "@types/chai-as-promised": "7.1.5",
+    "@types/chai-spies": "1.0.3",
+    "@types/mocha": "10.0.0",
+    "@typescript-eslint/eslint-plugin": "5.42.0",
+    "@typescript-eslint/parser": "5.42.0",
+    "chai": "4.3.6",
+    "chai-as-promised": "7.1.1",
+    "chai-spies": "1.0.0",
+    "conventional-changelog-cli": "2.2.2",
+    "eslint": "8.26.0",
+    "eslint-config-prettier": "8.5.0",
+    "eslint-plugin-jsdoc": "39.4.0",
+    "eslint-plugin-prettier": "4.2.1",
+    "eslint-plugin-unicorn": "43.0.2",
+    "mocha": "10.1.0",
+    "nyc": "15.1.0",
+    "prepend-file-cli": "1.0.6",
+    "prettier": "2.7.1",
+    "rimraf": "3.0.2",
+    "ts-node": "10.9.1",
+    "tslint": "6.1.3",
+    "typedoc": "0.22.18",
+    "typescript": "4.4.4"
+  },
   "nyc": {
     "all": true,
     "branches": 95,
     "check-coverage": true,
     "exclude": [
-      "src/SMTP.ts",
+      "src/smtp.ts",
       "src/cli.ts"
     ],
     "extension": [
@@ -42,36 +83,13 @@
     "lines": 95,
     "per-file": true,
     "reporter": [
+      "cobertura",
       "html",
       "text-summary"
     ],
+    "require": [
+      "ts-node/register"
+    ],
     "statements": 95
-  },
-  "devDependencies": {
-    "@openstapps/configuration": "0.16.1",
-    "@types/chai": "4.1.7",
-    "@types/chai-as-promised": "7.1.0",
-    "@types/mocha": "5.2.6",
-    "@types/sinon": "7.0.11",
-    "chai": "4.2.0",
-    "chai-as-promised": "7.1.1",
-    "conventional-changelog-cli": "2.0.17",
-    "mocha": "6.1.4",
-    "mocha-typescript": "1.1.17",
-    "nyc": "14.1.1",
-    "prepend-file-cli": "1.0.6",
-    "rimraf": "2.6.3",
-    "sinon": "7.3.2",
-    "ts-node": "8.1.0",
-    "tslint": "5.16.0",
-    "typedoc": "0.14.2",
-    "typescript": "3.4.5"
-  },
-  "dependencies": {
-    "@types/node": "10.14.7",
-    "@types/nodemailer": "6.1.0",
-    "chalk": "2.4.2",
-    "flatted": "2.0.0",
-    "nodemailer": "6.1.1"
   }
 }

src/Logger.ts

@@ -1,206 +0,0 @@
-/*
- * Copyright (C) 2018, 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 chalk from 'chalk';
-import {stringify} from 'flatted';
-import {isNodeEnvironment, isProductiveNodeEnvironment} from './common';
-import {Transport} 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:
- * ```
- * INFO: 1
- * LOG: 2
- * WARN: 4
- * ERROR: 8
- * OK: 16
- * ```
- */
-export class Logger {
-  /**
-   * Log levels
-   */
-  private static logLevels = [
-    'INFO',
-    'LOG',
-    'WARN',
-    'ERROR',
-    'OK',
-  ];
-
-  /**
-   * Transport for errors
-   */
-  private static transport?: Transport;
-
-  /**
-   * Check if intended log level is allowed in environment log level
-   *
-   * @param logLevel
-   */
-  private static checkLogLevel(logLevel: string): boolean {
-    const logLevelNumber = Math.pow(2, Logger.logLevels.indexOf(logLevel) + 1) - 1;
-
-    /* tslint:disable-next-line:no-bitwise */
-    return !!(Logger.getLogLevel() & logLevelNumber);
-  }
-
-  /**
-   * Return log level from environment
-   */
-  private static getLogLevel(): number {
-    if (isNodeEnvironment() && typeof process.env.STAPPS_LOG_LEVEL !== 'undefined') {
-      // 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;
-  }
-
-  /**
-   * Log an error
-   *
-   * @param args Arguments to log
-   */
-  public static async error(...args: any[]): Promise<string | void> {
-    if (!Logger.checkLogLevel('ERROR')) {
-      return;
-    }
-
-    /* tslint:disable-next-line:no-console */
-    console.error(chalk.bold.red(`[ERROR] ${Logger.stringifyArguments(...args)}`));
-
-    if (isProductiveNodeEnvironment()) {
-      if (typeof Logger.transport !== 'undefined') {
-        return Logger.transport.send('Error', Logger.stringifyArguments(...args));
-      } else if (!process.env.ALLOW_NO_TRANSPORT) {
-        throw new Error(`Error couldn't be transported! Please set a transport or set ALLOW_NO_TRANSPORT='true'.`);
-      }
-    }
-  }
-
-  /**
-   * Log an information
-   *
-   * @param args Arguments to log
-   */
-  public static info(...args: any[]): void {
-    if (!Logger.checkLogLevel('INFO')) {
-      return;
-    }
-
-    /* tslint:disable-next-line:no-console */
-    console.info(chalk.cyan(`[INFO] ${Logger.stringifyArguments(args)}`));
-  }
-
-  /**
-   * Check if the logger is initialized correctly
-   */
-  public static initialized(): void {
-    if (isProductiveNodeEnvironment() && typeof Logger.transport === 'undefined') {
-      if (!process.env.ALLOW_NO_TRANSPORT) {
-        throw new Error(`Productive environment doesn't set a transport for error notifications.`);
-      } else {
-        /* tslint:disable-next-line:no-console */
-        console.warn(chalk.yellow(`Productive environment doesn't set a transport for error notifications.`));
-      }
-    }
-  }
-
-  /**
-   * Log something
-   *
-   * @param args Arguments to log
-   */
-  public static log(...args: any[]): void {
-    if (!this.checkLogLevel('LOG')) {
-      return;
-    }
-
-    /* tslint:disable-next-line:no-console */
-    console.log(chalk.white(`[LOG] ${Logger.stringifyArguments(args)}`));
-  }
-
-  /**
-   * Log something successful
-   *
-   * @param args Arguments to log
-   */
-  public static ok(...args: any[]): void {
-    if (!this.checkLogLevel('OK')) {
-      return;
-    }
-
-    /* tslint:disable-next-line:no-console */
-    console.log(chalk.bold.green(`[OK] ${Logger.stringifyArguments(args)}`));
-  }
-
-  /**
-   * 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: any[]): string {
-    const result: string[] = [];
-
-    args.forEach((argument) => {
-      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 a warning
-   *
-   * @param args Arguments to log
-   */
-  public static warn(...args: any[]): void {
-    if (!this.checkLogLevel('WARN')) {
-      return;
-    }
-
-    /* tslint:disable-next-line:no-console */
-    console.warn(chalk.yellow(`[WARN] ${Logger.stringifyArguments(args)}`));
-  }
-}

src/common.ts

@@ -12,42 +12,51 @@
  * 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
  */
-import {Transport, VerifiableTransport} from './Transport';
-
 export type RecursivePartial<T> = {
-  [P in keyof T]?: T[P] extends Array<infer U> ?
+  [P in keyof T]?: T[P] extends Array<infer U>
-    Array<RecursivePartial<U>> :
+    ? Array<RecursivePartial<U>>
-    T[P] extends object ? RecursivePartial<T[P]> : T[P];
+    : T[P] extends object
+    ? RecursivePartial<T[P]>
+    : T[P];
 };
 
 /**
  * Deletes all properties that are undefined from an object
- * @param obj
+ *
+ * @param object Object to delete undefined properties from
  */
-export function deleteUndefinedProperties(obj: any) {
+export function deleteUndefinedProperties(object: unknown): unknown {
   // return atomic data types and arrays (recursion anchor)
-  if (typeof obj !== 'object' || Array.isArray(obj)) {
+  if (typeof object !== 'object' || Array.isArray(object)) {
-    return obj;
+    return object;
   }
 
   // check each key
-  Object.keys(obj).forEach((key) => {
+  for (const key in object) {
-    if (typeof obj[key] === 'undefined') {
+    /* istanbul ignore if */
+    if (!object.hasOwnProperty(key)) {
+      continue;
+    }
+
+    const indexedObject = object as {[k: string]: unknown};
+
+    if (typeof indexedObject[key] === 'undefined') {
       // delete undefined keys
-      delete obj[key];
+      delete indexedObject[key];
     } else {
       // check recursive
-      obj[key] = deleteUndefinedProperties(obj[key]);
+      indexedObject[key] = deleteUndefinedProperties(indexedObject[key]);
     }
-  });
+  }
 
-  return obj;
+  return object;
 }
 
 /**
@@ -61,9 +70,11 @@ export function isNodeEnvironment(): boolean {
  * Checks if environment is productive
  */
 export function isProductiveEnvironment(): boolean {
-  return typeof process.env === 'object'
+  return (
-    && typeof process.env.NODE_ENV !== 'undefined'
+    typeof process.env === 'object' &&
-    && process.env.NODE_ENV === 'production';
+    typeof process.env.NODE_ENV !== 'undefined' &&
+    process.env.NODE_ENV === 'production'
+  );
 }
 
 /**

src/logger.ts

@@ -0,0 +1,348 @@
+/*
+ * 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, isProductiveEnvironment, 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
+   * Will strip newlines in production environment
+   *
+   * @param logLevel Log level of the output
+   * @param output Output to apply transformations to
+   */
+  private static applyTransformers(logLevel: LogLevel, output: string): string {
+    if (isProductiveEnvironment()) {
+      output = output.replace(/[\n\r]/g, ' ');
+    }
+
+    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;
+    }
+    // eslint-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 Number.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 arguments_ Arguments to log
+   */
+  public static async error(...arguments_: unknown[]): Promise<string | void> {
+    if (!Logger.checkLogLevel('ERROR')) {
+      return;
+    }
+
+    // eslint-disable-next-line no-console
+    console.error(Logger.applyTransformers('ERROR', Logger.stringifyArguments(...arguments_)));
+
+    if (isProductiveNodeEnvironment()) {
+      if (typeof Logger.transport !== 'undefined') {
+        return Logger.transport.send('Error', Logger.stringifyArguments(...arguments_));
+      }
+
+      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 arguments_ Arguments to log
+   */
+  public static info(...arguments_: unknown[]): void {
+    if (!Logger.checkLogLevel('INFO')) {
+      return;
+    }
+
+    // eslint-disable-next-line no-console
+    console.info(Logger.applyTransformers('INFO', Logger.stringifyArguments(...arguments_)));
+    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 arguments_ Arguments to log
+   */
+  public static log(...arguments_: unknown[]): void {
+    if (!Logger.checkLogLevel('LOG')) {
+      return;
+    }
+
+    // eslint-disable-next-line no-console
+    console.log(Logger.applyTransformers('LOG', Logger.stringifyArguments(...arguments_)));
+    if (Logger.checkExitLevel('LOG')) {
+      Logger.exit();
+    }
+  }
+
+  /**
+   * Log something successful
+   *
+   * @param arguments_ Arguments to log
+   */
+  public static ok(...arguments_: unknown[]): void {
+    if (!Logger.checkLogLevel('OK')) {
+      return;
+    }
+
+    // eslint-disable-next-line no-console
+    console.log(Logger.applyTransformers('OK', Logger.stringifyArguments(...arguments_)));
+    if (Logger.checkExitLevel('OK')) {
+      Logger.exit();
+    }
+  }
+
+  /**
+   * Set transformations for log output
+   *
+   * @param transformations List of transformations
+   */
+  public static setTransformations(transformations: Transformation[]) {
+    const transforms = transformations.filter(transform =>
+      isProductiveEnvironment() ? transform.useInProduction === true : true,
+    );
+    Logger.transformations = transforms;
+  }
+
+  /**
+   * Set a transport
+   *
+   * @param transport Transport to set
+   */
+  public static setTransport(transport?: Transport) {
+    Logger.transport = transport;
+  }
+
+  /**
+   * Stringify a list of arguments
+   *
+   * @param arguments_ Arguments to stringify
+   */
+  public static stringifyArguments(...arguments_: unknown[]): string {
+    const result: string[] = [];
+
+    for (const argument of arguments_) {
+      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 {
+        result.push(stringify(argument, undefined, 2));
+      }
+    }
+
+    return result.join(', ');
+  }
+
+  /**
+   * Log a warning
+   *
+   * @param arguments_ Arguments to log
+   */
+  public static warn(...arguments_: unknown[]): void {
+    if (!Logger.checkLogLevel('WARN')) {
+      return;
+    }
+
+    // eslint-disable-next-line no-console
+    console.warn(Logger.applyTransformers('WARN', Logger.stringifyArguments(...arguments_)));
+    if (Logger.checkExitLevel('WARN')) {
+      Logger.exit();
+    }
+  }
+}

src/smtp.ts

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018, 2019 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.
@@ -15,23 +15,56 @@
 import * as nodemailer from 'nodemailer';
 import {MailOptions} from 'nodemailer/lib/sendmail-transport';
 import {deleteUndefinedProperties, isProductiveEnvironment, RecursivePartial} from './common';
-import {VerifiableTransport} from './Transport';
+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;
   };
 }
@@ -40,7 +73,9 @@ export interface SMTPConfig {
  * An implementation of mail transport via SMTP
  */
 export class SMTP extends VerifiableTransport {
-
+  /**
+   * Singleton instance
+   */
   private static _instance: SMTP;
 
   /**
@@ -51,8 +86,14 @@ export class SMTP extends VerifiableTransport {
   /**
    * Who is using this service
    */
-  private from: {
+  private readonly from: {
+    /**
+     * Mail of sender
+     */
     mail: string;
+    /**
+     * Name of sender
+     */
     name?: string;
   };
 
@@ -64,7 +105,7 @@ export class SMTP extends VerifiableTransport {
   /**
    * Connection to SMTP server
    */
-  private transportAgent: nodemailer.Transporter;
+  private readonly transportAgent: nodemailer.Transporter;
 
   /**
    * Set to true if the transport was verified
@@ -84,30 +125,31 @@ export class SMTP extends VerifiableTransport {
    * 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) {
+    if (typeof SMTP._instance !== 'undefined') {
-      return this._instance;
+      return SMTP._instance;
     }
 
     // monitoring is not required -> SMTP init can fail
     if (!isProductiveEnvironment() || process.env.ALLOW_NO_TRANSPORT === 'true') {
       try {
-        this._instance = new this(config);
+        SMTP._instance = new SMTP(config);
-      } catch (err) {
+      } catch {
-        /* tslint:disable-next-line:no-console */
+        // eslint-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;
   }
 
   /**
@@ -117,110 +159,112 @@ export class SMTP extends VerifiableTransport {
    * For more information please consider reading
    * https://stackoverflow.com/a/2071250
    *
-   * @param {string} address
+   * @param address Address to validate
-   * @return {boolean}
    */
   public static isValidEmailAddress(address: string): boolean {
     // tslint:disable-next-line:max-line-length
-    return /^(([^<>()\[\].,;:\s@"]+(\.[^<>()\[\].,;:\s@"]+)*)|(".+"))@(([^<>()[\].,;:\s@"]+\.)+[^<>()[\].,;:\s@"]{2,})$/i.test(address);
+    return /^(([^<>()\[\].,;:\s@"]+(\.[^<>()\[\].,;:\s@"]+)*)|(".+"))@(([^<>()[\].,;:\s@"]+\.)+[^<>()[\].,;:\s@"]{2,})$/i.test(
+      address,
+    );
   }
 
   /**
-   * Checks a list of mail addresses for validity.
+   * Checks a list of mail addresses for validity
-   * @param {string[]} recipients
+   *
-   * @return {string[]}
+   * @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
+   * Creates an SMTP connection.
-   * call `new SMTP()`
+   *
-   * @param {SMTPConfig} config
+   * 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> = {
+    const environmentConfig: RecursivePartial<SMTPConfig> = {
       auth: {
         password: process.env.SMTP_AUTH_PASSWORD,
         user: process.env.SMTP_AUTH_USER,
       },
-      cc: ((typeof process.env.SMTP_CC !== 'undefined') ? (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 !== 'undefined') ? parseInt(process.env.SMTP_PORT, 10) : undefined,
+      port:
-      recipients: (typeof process.env.SMTP_RECIPIENTS !== 'undefined') ?
+        typeof process.env.SMTP_PORT !== 'undefined' ? Number.parseInt(process.env.SMTP_PORT, 10) : undefined,
-        (process.env.SMTP_RECIPIENTS).split(',') :
+      recipients:
-        [],
+        typeof process.env.SMTP_RECIPIENTS !== 'undefined' ? process.env.SMTP_RECIPIENTS.split(',') : [],
-      secure: (typeof process.env.SMTP_SECURE !== 'undefined') ? (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
+    const config = {
-    config = {
+      ...smtpConfig,
-      ...config,
       // deleting undefined properties so the actual config doesn't get overwritten by undefined values
-      ...deleteUndefinedProperties(envConfig),
+      ...(deleteUndefinedProperties(environmentConfig) as object),
-    };
+    } as SMTPConfig;
 
-    if (typeof config!.host === 'undefined') {
+    if (typeof config.host === 'undefined') {
-      throw new Error(
+      throw new TypeError(
         'SMTP configuration needs a host. Add it to the config or use environment variables (SMTP_HOST).',
       );
     }
 
-    if (typeof config!.port === 'undefined' || isNaN(config!.port)) {
+    if (typeof config.port === 'undefined' || Number.isNaN(config.port)) {
-      throw new Error(
+      throw new TypeError(
         '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(
+      throw new TypeError(
         'SMTP configuration needs an auth object.' +
-        'Add it to the config or use environment variables (SMTP_AUTH_USER, SMTP_AUTH_PASSWORD).',
+          'Add it to the config or use environment variables (SMTP_AUTH_USER, SMTP_AUTH_PASSWORD).',
       );
     }
 
-    if (typeof config!.auth.user === 'undefined') {
+    if (typeof config.auth.user === 'undefined') {
-      throw new Error(
+      throw new TypeError(
         'SMTP auth configuration needs a user. Add it to the config or use environment variables (SMTP_AUTH_USER).',
       );
     }
 
-    if (typeof config!.auth.password === 'undefined') {
+    if (typeof config.auth.password === 'undefined') {
-      throw new Error(
+      throw new TypeError(
         'SMTP auth configuration needs a password.' +
-        'Add it to the config or use environment variables (SMTP_AUTH_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 === 0) {
       throw new Error(
         'SMTP configuration needs recipients. Add it to the config or use environment variables (SMTP_RECIPIENTS).',
       );
     }
 
-    if (typeof config!.sender.mail === 'undefined') {
+    if (typeof config.sender.mail === 'undefined') {
-      throw new Error(
+      throw new TypeError(
         'SMTP configuration needs a sender. Add it to the config or use environment variables (SMTP_SENDER_MAIL).',
       );
     }
 
     super();
 
-    if (SMTP.isValidRecipientsList(config!.recipients)) {
+    if (SMTP.isValidRecipientsList(config.recipients)) {
-      this.recipients = config!.recipients;
+      this.recipients = config.recipients;
     } else {
       throw new Error('Invalid recipients found');
     }
 
-    if (typeof config!.cc !== 'undefined') {
+    if (typeof config.cc !== 'undefined') {
-      if (SMTP.isValidRecipientsList(config!.cc)) {
+      if (SMTP.isValidRecipientsList(config.cc)) {
-        this.cc = config!.cc!;
+        this.cc = config.cc;
       } else {
         throw new Error('Invalid cc recipients found');
       }
@@ -228,25 +272,24 @@ export class SMTP extends VerifiableTransport {
       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,
+        pass: config.auth.password,
-        user: config!.auth.user,
+        user: config.auth.user,
       },
-      host: config!.host,
+      host: config.host,
-      port: config!.port,
+      port: config.port,
-      secure: typeof config!.secure !== 'undefined' ? config!.secure : false,
+      secure: typeof config.secure !== 'undefined' ? config.secure : false,
     });
   }
 
   /**
    * Check if instance was verified at least once
-   * @returns {boolean}
    */
   public isVerified(): boolean {
     return this.verified;
@@ -255,14 +298,15 @@ export class SMTP extends VerifiableTransport {
   /**
    * 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,
+      from: typeof this.from.name !== 'string' ? `${this.from.name} <${this.from.mail}>` : this.from.mail,
       subject: subject,
       text: message,
       to: this.recipients,
@@ -271,7 +315,8 @@ export class SMTP extends VerifiableTransport {
 
   /**
    * 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
@@ -298,36 +343,36 @@ export class SMTP extends VerifiableTransport {
    * @returns true if the transport is valid
    */
   public async verify(): Promise<boolean> {
-
+    let verificationSuccessfull = false;
-    let verificationSuccessfull: boolean = false;
 
     try {
       verificationSuccessfull = await this.transportAgent.verify();
-    } catch (err) {
+    } catch (error) {
       if (!isProductiveEnvironment() || process.env.ALLOW_NO_TRANSPORT !== 'true') {
-        throw err;
+        throw error;
-      } else {
-        /* tslint:disable-next-line:no-console */
-        console.warn(
-          'SMTP verification error was ignored, because tranport failures are allowed: ',
-          err.message,
-        );
       }
+
+      // eslint-disable-next-line no-console
+      console.warn(
+        'SMTP verification error was ignored, because tranport failures are allowed:',
+        (error as Error).message,
+      );
     }
 
     if (!verificationSuccessfull) {
       if (!isProductiveEnvironment() || process.env.ALLOW_NO_TRANSPORT !== 'true') {
         throw new Error(
           'Verification of SMTP transport failed.' +
-          'If you want to ignore this error set' +
+            'If you want to ignore this error set' +
-          '`NODE_ENV=dev` or `ALLOW_NO_TRANSPORT=true`',
+            '`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.');
       }
+
+      // eslint-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 +1,33 @@
+/*
+ * 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 {
+  /**
+   * Indicates if this transformation is stripped in production environments
+   */
+  useInProduction: boolean;
+
+  /**
+   * 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 +1,37 @@
+/*
+ * 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 {
+  /**
+   * Keep this transformation in production environments
+   */
+  useInProduction = true;
+
+  /**
+   * 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 +1,54 @@
+/*
+ * 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 from 'chalk';
+import {LogLevel} from '../logger';
+import {Transformation} from '../transformation';
+
+/**
+ * Transformation that colorizes log output
+ */
+export class Colorize implements Transformation {
+  /**
+   * Skip this transformation in production environments
+   */
+  useInProduction = false;
+
+  /**
+   * Instantiate a new colorize transformation
+   *
+   * @param logLevelToColor Map from log level to color transformation to apply
+   */
+  constructor(
+    private readonly logLevelToColor: {[k in LogLevel]: chalk.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 +1,36 @@
+/*
+ * 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 {
+  /**
+   * Keep this transformation in production environments
+   */
+  useInProduction = true;
+
+  /**
+   * 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 {
+    return `[${new Date().toISOString()}] ${output}`;
+  }
+}

src/transport.ts

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018, 2019 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.

test/Logger.spec.ts

@@ -1,293 +0,0 @@
-/*
- * Copyright (C) 2018, 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 * as chai from 'chai';
-import {expect} from 'chai';
-import * as chaiAsPromised from 'chai-as-promised';
-import {slow, suite, test, timeout} from 'mocha-typescript';
-import * as sinon from 'sinon';
-import {Logger} from '../src/Logger';
-import {DummyTransport} from './Transport.spec';
-
-chai.should();
-chai.use(chaiAsPromised);
-
-@suite(timeout(2000), slow(1000))
-export class LoggerSpec {
-  @test
-  async error() {
-    const stub = sinon.stub(console, 'error');
-
-    await Logger.error('Foobar');
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('[ERROR]');
-    expect(stub.args[0][0]).contains('Foobar');
-  }
-
-  @test
-  async errorInProductiveEnvironment() {
-    const errorStub = sinon.stub(console, 'error');
-
-    const nodeEnv = process.env.NODE_ENV;
-    process.env.NODE_ENV = 'production';
-
-    await Logger.error('Foobar').should.be.rejectedWith(Error);
-    expect(errorStub.callCount).to.be.equal(1);
-
-    process.env.ALLOW_NO_TRANSPORT = 'true';
-
-    await Logger.error('Foobar').should.not.be.rejectedWith(Error);
-    expect(errorStub.callCount).to.be.equal(2);
-
-    delete process.env.ALLOW_NO_TRANSPORT;
-
-    Logger.setTransport(new DummyTransport());
-
-    await Logger.error('Foobar').should.not.be.rejectedWith(Error);
-    expect(errorStub.callCount).to.be.equal(3);
-
-    Logger.setTransport();
-
-    process.env.NODE_ENV = nodeEnv;
-
-    errorStub.restore();
-  }
-
-  @test
-  async errorNoOutput() {
-    const stub = sinon.stub(console, 'error');
-
-    process.env.STAPPS_LOG_LEVEL = '0';
-
-    await Logger.error('Foobar');
-
-    stub.restore();
-
-    delete process.env.STAPPS_LOG_LEVEL;
-
-    return expect(stub.called).to.be.false;
-  }
-
-  @test
-  async errorWithError() {
-    const e = new Error();
-    const stub = sinon.stub(console, 'error');
-
-    await Logger.error(e);
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('Error').contains('at').contains(process.cwd());
-  }
-
-  @test
-  getLogLevel() {
-    const savedProcess = process;
-
-    // @ts-ignore
-    process = undefined;
-
-    (global as any).window = {
-      STAPPS_LOG_LEVEL: 0,
-    };
-
-    const stub = sinon.stub(console, 'info');
-
-    Logger.info('Foobar');
-
-    stub.restore();
-
-    process = savedProcess;
-
-    delete (global as any).window;
-
-    return expect(stub.called).to.be.false;
-  }
-
-  @test
-  info() {
-    const stub = sinon.stub(console, 'info');
-
-    Logger.info('Foobar');
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('[INFO]');
-    expect(stub.args[0][0]).contains('Foobar');
-  }
-
-  @test
-  infoNoOutput() {
-    const stub = sinon.stub(console, 'info');
-
-    process.env.STAPPS_LOG_LEVEL = '0';
-
-    Logger.info('Foobar');
-
-    stub.restore();
-
-    delete process.env.STAPPS_LOG_LEVEL;
-
-    return expect(stub.called).to.be.false;
-  }
-
-  @test
-  initialized() {
-    Logger.setTransport(new DummyTransport());
-
-    expect(() => {
-      Logger.initialized();
-    }).not.to.throw();
-
-    Logger.setTransport();
-  }
-
-  @test
-  initializedInProductiveEnvironment() {
-    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 stub = sinon.stub(console, 'warn');
-
-    process.env.ALLOW_NO_TRANSPORT = 'true';
-
-    expect(() => {
-      Logger.initialized();
-    }).not.to.throw();
-
-    delete process.env.ALLOW_NO_TRANSPORT;
-
-    expect(stub.called).to.be.equal(true);
-
-    stub.restore();
-
-    process.env.NODE_ENV = nodeEnv;
-  }
-
-  @test
-  log() {
-    const stub = sinon.stub(console, 'log');
-
-    Logger.log('Foobar');
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('[LOG]');
-    expect(stub.args[0][0]).contains('Foobar');
-  }
-
-  @test
-  logNoOutput() {
-    const stub = sinon.stub(console, 'log');
-
-    process.env.STAPPS_LOG_LEVEL = '0';
-
-    Logger.log('Foobar');
-
-    stub.restore();
-
-    delete process.env.STAPPS_LOG_LEVEL;
-
-    return expect(stub.called).to.be.false;
-  }
-
-  @test
-  ok() {
-    const stub = sinon.stub(console, 'log');
-
-    Logger.ok('Foobar');
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('[OK]');
-    expect(stub.args[0][0]).contains('Foobar');
-  }
-
-  @test
-  okNoOutput() {
-    const stub = sinon.stub(console, 'log');
-
-    process.env.STAPPS_LOG_LEVEL = '0';
-
-    Logger.ok('Foobar');
-
-    stub.restore();
-
-    delete process.env.STAPPS_LOG_LEVEL;
-
-    return expect(stub.called).to.be.false;
-  }
-
-  @test
-  setTransport() {
-    expect(() => {
-      Logger.setTransport(new DummyTransport());
-      Logger.setTransport();
-    }).not.to.throw();
-  }
-
-  @test
-  stringifyArguments() {
-    const stub = sinon.stub(console, 'log');
-
-    Logger.log('foo', 'bar');
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('[LOG]');
-    expect(stub.args[0][0]).contains('foo');
-    expect(stub.args[0][0]).contains('bar');
-  }
-
-  @test
-  warn() {
-    const stub = sinon.stub(console, 'warn');
-
-    Logger.warn('Foobar');
-
-    stub.restore();
-
-    expect(stub.args[0][0]).contains('[WARN]');
-    expect(stub.args[0][0]).contains('Foobar');
-  }
-
-  @test
-  warnNoOutput() {
-    const stub = sinon.stub(console, 'warn');
-
-    process.env.STAPPS_LOG_LEVEL = '0';
-
-    Logger.warn('Foobar');
-
-    stub.restore();
-
-    delete process.env.STAPPS_LOG_LEVEL;
-
-    return expect(stub.called).to.be.false;
-  }
-}

test/common.spec.ts

@@ -13,7 +13,7 @@
  * this program. If not, see <https://www.gnu.org/licenses/>.
  */
 import {expect} from 'chai';
-import {slow, suite, test, timeout} from 'mocha-typescript';
+import {suite, test} from '@testdeck/mocha';
 import {
   deleteUndefinedProperties,
   isNodeEnvironment,
@@ -21,7 +21,7 @@ import {
   isProductiveNodeEnvironment,
 } from '../src/common';
 
-@suite(timeout(2000), slow(1000))
+@suite()
 export class CommonSpec {
   @test
   deleteUndefinedProperties1() {

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 +1,482 @@
+/*
+ * 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, test} from '@testdeck/mocha';
+import {Logger} from '../src/logger';
+import {AddLogLevel} from '../src/transformations/add-log-level';
+import {Colorize} from '../src/transformations/colorize';
+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
+  'is compatible with log aggregation in productive environment'() {
+    Logger.setTransformations([new AddLogLevel(), new Colorize()]);
+
+    let spy = LoggerSpec.sandbox.on(console, 'log', () => {
+      // noop
+    });
+
+    Logger.log('Foo\nbar');
+
+    expect(spy).to.have.been.called.once;
+    expect(spy.__spy.calls[0][0]).to.equal('\u001B[37m[LOG] Foo\u001B[39m\n\u001B[37mbar\u001B[39m');
+
+    const nodeEnv = process.env.NODE_ENV;
+    process.env.NODE_ENV = 'production';
+    process.env.ALLOW_NO_TRANSPORT = 'true';
+
+    Logger.setTransformations([new AddLogLevel(), new Colorize()]);
+
+    Logger.log('Foo\nbar');
+
+    expect(spy).to.have.been.called.twice;
+    expect(spy.__spy.calls[1][0]).to.equal('[LOG] Foo bar');
+
+    process.env.NODE_ENV = nodeEnv;
+    delete process.env.ALLOW_NO_TRANSPORT;
+  }
+
+  @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(new 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 {suite, test} from '@testdeck/mocha';
-import {SMTP} from '../src/SMTP';
+import {SMTP} from '../src/smtp';
 
-// tslint:disable:no-unused-expression
+@suite()
-
-@suite(timeout(2000), slow(1000))
 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 '@testdeck/mocha';
+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 '@testdeck/mocha';
+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 +1,28 @@
+/*
+ * 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 '@testdeck/mocha';
+import {Timestamp} from '../../src/transformations/timestamp';
+
+@suite()
+export class TimeStampSpec {
+  @test
+  'default'() {
+
+    const transformation = new Timestamp();
+
+    expect(transformation.transform('ERROR', 'Foobar')).to.be.contain(`Z`);
+  }
+}

test/transport.spec.ts

@@ -13,45 +13,11 @@
  * this program. If not, see <https://www.gnu.org/licenses/>.
  */
 import {expect} from 'chai';
-import {slow, suite, test, timeout} from 'mocha-typescript';
+import {suite, test} from '@testdeck/mocha';
 import {isTransportWithVerification} from '../src/common';
-import {Transport, VerifiableTransport} from '../src/Transport';
+import {DummyTransport, VerifiableDummyTransport} from './dummyTransport';
 
-export class DummyTransport extends Transport {
+@suite()
-  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);
-    });
-  }
-}
-
-@suite(timeout(2000), slow(1000))
 export class TransportSpec {
   @test
   isNotTransportWithVerification() {

tslint.json

@@ -1,3 +0,0 @@
-{
-  "extends": "./node_modules/@openstapps/configuration/tslint.json"
-}