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Can be overridden to redirect output.\n   */\n  log: (...args: any[]) => void;\n  /**\n   * The namespace of this logger.\n   */\n  namespace: string;\n  /**\n   * Extends this logger with a child namespace.\n   * Namespaces are separated with a ':' character.\n   */\n  extend: (namespace: string) => Debugger;\n}\n\nconst debugEnvVariable =\n  (typeof process !== \"undefined\" && process.env && process.env.DEBUG) || undefined;\n\nlet enabledString: string | undefined;\nlet enabledNamespaces: RegExp[] = [];\nlet skippedNamespaces: RegExp[] = [];\nconst debuggers: Debugger[] = [];\n\nif (debugEnvVariable) {\n  enable(debugEnvVariable);\n}\n\nconst debugObj: Debug = Object.assign(\n  (namespace: string): Debugger => {\n    return createDebugger(namespace);\n  },\n  {\n    enable,\n    enabled,\n    disable,\n    log,\n  },\n);\n\nfunction enable(namespaces: string): void {\n  enabledString = namespaces;\n  enabledNamespaces = [];\n  skippedNamespaces = [];\n  const wildcard = /\\*/g;\n  const namespaceList = namespaces.split(\",\").map((ns) => ns.trim().replace(wildcard, \".*?\"));\n  for (const ns of namespaceList) {\n    if (ns.startsWith(\"-\")) {\n      skippedNamespaces.push(new RegExp(`^${ns.substr(1)}$`));\n    } else {\n      enabledNamespaces.push(new RegExp(`^${ns}$`));\n    }\n  }\n  for (const instance of debuggers) {\n    instance.enabled = enabled(instance.namespace);\n  }\n}\n\nfunction enabled(namespace: string): boolean {\n  if (namespace.endsWith(\"*\")) {\n    return true;\n  }\n\n  for (const skipped of skippedNamespaces) {\n    if (skipped.test(namespace)) {\n      return false;\n    }\n  }\n  for (const enabledNamespace of enabledNamespaces) {\n    if (enabledNamespace.test(namespace)) {\n      return true;\n    }\n  }\n  return false;\n}\n\nfunction disable(): string {\n  const result = enabledString || \"\";\n  enable(\"\");\n  return result;\n}\n\nfunction createDebugger(namespace: string): Debugger {\n  const newDebugger: Debugger = Object.assign(debug, {\n    enabled: enabled(namespace),\n    destroy,\n    log: debugObj.log,\n    namespace,\n    extend,\n  });\n\n  function debug(...args: any[]): void {\n    if (!newDebugger.enabled) {\n      return;\n    }\n    if (args.length > 0) {\n      args[0] = `${namespace} ${args[0]}`;\n    }\n    newDebugger.log(...args);\n  }\n\n  debuggers.push(newDebugger);\n\n  return newDebugger;\n}\n\nfunction destroy(this: Debugger): boolean {\n  const index = debuggers.indexOf(this);\n  if (index >= 0) {\n    debuggers.splice(index, 1);\n    return true;\n  }\n  return false;\n}\n\nfunction extend(this: Debugger, namespace: string): Debugger {\n  const newDebugger = createDebugger(`${this.namespace}:${namespace}`);\n  newDebugger.log = this.log;\n  return newDebugger;\n}\n\nexport default debugObj;\n"]}