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  1. // Originally from Definitely Typed, see:
  2. // https://github.com/DefinitelyTyped/DefinitelyTyped/blob/b4683d7/types/loglevel/index.d.ts
  3. // Original definitions by: Stefan Profanter <https://github.com/Pro>
  4. // Gabor Szmetanko <https://github.com/szmeti>
  5. // Christian Rackerseder <https://github.com/screendriver>
  6. declare const log: log.RootLogger;
  7. export = log;
  8. declare namespace log {
  9. /**
  10. * Log levels
  11. */
  12. interface LogLevel {
  13. TRACE: 0;
  14. DEBUG: 1;
  15. INFO: 2;
  16. WARN: 3;
  17. ERROR: 4;
  18. SILENT: 5;
  19. }
  20. /**
  21. * Possible log level numbers.
  22. */
  23. type LogLevelNumbers = LogLevel[keyof LogLevel];
  24. /**
  25. * Possible log level descriptors, may be string, lower or upper case, or number.
  26. */
  27. type LogLevelDesc = LogLevelNumbers
  28. | 'trace'
  29. | 'debug'
  30. | 'info'
  31. | 'warn'
  32. | 'error'
  33. | 'silent'
  34. | keyof LogLevel;
  35. type LoggingMethod = (...message: any[]) => void;
  36. type MethodFactory = (methodName: string, level: LogLevelNumbers, loggerName: string) => LoggingMethod;
  37. interface RootLogger extends Logger {
  38. /**
  39. * If you're using another JavaScript library that exposes a 'log' global, you can run into conflicts with loglevel.
  40. * Similarly to jQuery, you can solve this by putting loglevel into no-conflict mode immediately after it is loaded
  41. * onto the page. This resets to 'log' global to its value before loglevel was loaded (typically undefined), and
  42. * returns the loglevel object, which you can then bind to another name yourself.
  43. */
  44. noConflict(): any;
  45. /**
  46. * This gets you a new logger object that works exactly like the root log object, but can have its level and
  47. * logging methods set independently. All loggers must have a name (which is a non-empty string). Calling
  48. * getLogger() multiple times with the same name will return an identical logger object.
  49. * In large applications, it can be incredibly useful to turn logging on and off for particular modules as you are
  50. * working with them. Using the getLogger() method lets you create a separate logger for each part of your
  51. * application with its own logging level. Likewise, for small, independent modules, using a named logger instead
  52. * of the default root logger allows developers using your module to selectively turn on deep, trace-level logging
  53. * when trying to debug problems, while logging only errors or silencing logging altogether under normal
  54. * circumstances.
  55. * @param name The name of the produced logger
  56. */
  57. getLogger(name: string): Logger;
  58. /**
  59. * This will return you the dictionary of all loggers created with getLogger, keyed off of their names.
  60. */
  61. getLoggers(): { [name: string]: Logger };
  62. }
  63. interface Logger {
  64. /**
  65. * Available log levels.
  66. */
  67. readonly levels: LogLevel;
  68. /**
  69. * Plugin API entry point. This will be called for each enabled method each time the level is set
  70. * (including initially), and should return a MethodFactory to be used for the given log method, at the given level,
  71. * for a logger with the given name. If you'd like to retain all the reliability and features of loglevel, it's
  72. * recommended that this wraps the initially provided value of log.methodFactory
  73. */
  74. methodFactory: MethodFactory;
  75. /**
  76. * Output trace message to console.
  77. * This will also include a full stack trace
  78. *
  79. * @param msg any data to log to the console
  80. */
  81. trace(...msg: any[]): void;
  82. /**
  83. * Output debug message to console including appropriate icons
  84. *
  85. * @param msg any data to log to the console
  86. */
  87. debug(...msg: any[]): void;
  88. /**
  89. * Output info message to console including appropriate icons
  90. *
  91. * @param msg any data to log to the console
  92. */
  93. info(...msg: any[]): void;
  94. /**
  95. * Output warn message to console including appropriate icons
  96. *
  97. * @param msg any data to log to the console
  98. */
  99. warn(...msg: any[]): void;
  100. /**
  101. * Output error message to console including appropriate icons
  102. *
  103. * @param msg any data to log to the console
  104. */
  105. error(...msg: any[]): void;
  106. /**
  107. * This disables all logging below the given level, so that after a log.setLevel("warn") call log.warn("something")
  108. * or log.error("something") will output messages, but log.info("something") will not.
  109. *
  110. * @param level as a string, like 'error' (case-insensitive) or as a number from 0 to 5 (or as log.levels. values)
  111. * @param persist Where possible the log level will be persisted. LocalStorage will be used if available, falling
  112. * back to cookies if not. If neither is available in the current environment (i.e. in Node), or if you pass
  113. * false as the optional 'persist' second argument, persistence will be skipped.
  114. */
  115. setLevel(level: LogLevelDesc, persist?: boolean): void;
  116. /**
  117. * Returns the current logging level, as a value from LogLevel.
  118. * It's very unlikely you'll need to use this for normal application logging; it's provided partly to help plugin
  119. * development, and partly to let you optimize logging code as below, where debug data is only generated if the
  120. * level is set such that it'll actually be logged. This probably doesn't affect you, unless you've run profiling
  121. * on your code and you have hard numbers telling you that your log data generation is a real performance problem.
  122. */
  123. getLevel(): LogLevel[keyof LogLevel];
  124. /**
  125. * This sets the current log level only if one has not been persisted and cant be loaded. This is useful when
  126. * initializing scripts; if a developer or user has previously called setLevel(), this wont alter their settings.
  127. * For example, your application might set the log level to error in a production environment, but when debugging
  128. * an issue, you might call setLevel("trace") on the console to see all the logs. If that error setting was set
  129. * using setDefaultLevel(), it will still say as trace on subsequent page loads and refreshes instead of resetting
  130. * to error.
  131. *
  132. * The level argument takes is the same values that you might pass to setLevel(). Levels set using
  133. * setDefaultLevel() never persist to subsequent page loads.
  134. *
  135. * @param level as a string, like 'error' (case-insensitive) or as a number from 0 to 5 (or as log.levels. values)
  136. */
  137. setDefaultLevel(level: LogLevelDesc): void;
  138. /**
  139. * This enables all log messages, and is equivalent to log.setLevel("trace").
  140. *
  141. * @param persist Where possible the log level will be persisted. LocalStorage will be used if available, falling
  142. * back to cookies if not. If neither is available in the current environment (i.e. in Node), or if you pass
  143. * false as the optional 'persist' second argument, persistence will be skipped.
  144. */
  145. enableAll(persist?: boolean): void;
  146. /**
  147. * This disables all log messages, and is equivalent to log.setLevel("silent").
  148. *
  149. * @param persist Where possible the log level will be persisted. LocalStorage will be used if available, falling
  150. * back to cookies if not. If neither is available in the current environment (i.e. in Node), or if you pass
  151. * false as the optional 'persist' second argument, persistence will be skipped.
  152. */
  153. disableAll(persist?: boolean): void;
  154. }
  155. }