timers: refactor to use module.exports

PR-URL: #26583
Refs: #26546
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: joyeecheung

lib/timers.js

@@ -185,16 +185,15 @@ function decRefCount() {
 
 // Schedule or re-schedule a timer.
 // The item must have been enroll()'d first.
-const active = exports.active = function(item) {
+function active(item) {
   insert(item, true, getLibuvNow());
-};
+}
 
 // Internal APIs that need timeouts should use `_unrefActive()` instead of
 // `active()` so that they do not unnecessarily keep the process open.
-exports._unrefActive = function(item) {
+function _unrefActive(item) {
   insert(item, false, getLibuvNow());
-};
-
+}
 
 // The underlying logic for scheduling or re-scheduling a timer.
 //
@@ -406,12 +405,6 @@ function unenroll(item) {
   item._idleTimeout = -1;
 }
 
-exports.unenroll = util.deprecate(unenroll,
-                                  'timers.unenroll() is deprecated. ' +
-                                  'Please use clearTimeout instead.',
-                                  'DEP0096');
-
-
 // Make a regular object able to act as a timer by setting some properties.
 // This function does not start the timer, see `active()`.
 // Using existing objects as timers slightly reduces object overhead.
@@ -426,11 +419,6 @@ function enroll(item, msecs) {
   item._idleTimeout = msecs;
 }
 
-exports.enroll = util.deprecate(enroll,
-                                'timers.enroll() is deprecated. ' +
-                                'Please use setTimeout instead.',
-                                'DEP0095');
-
 
 /*
  * DOM-style timers
@@ -476,18 +464,14 @@ setTimeout[internalUtil.promisify.custom] = function(after, value) {
   });
 };
 
-exports.setTimeout = setTimeout;
-
-
-const clearTimeout = exports.clearTimeout = function clearTimeout(timer) {
+function clearTimeout(timer) {
   if (timer && timer._onTimeout) {
     timer._onTimeout = null;
     unenroll(timer);
   }
-};
-
+}
 
-exports.setInterval = function setInterval(callback, repeat, arg1, arg2, arg3) {
+function setInterval(callback, repeat, arg1, arg2, arg3) {
   if (typeof callback !== 'function') {
     throw new ERR_INVALID_CALLBACK();
   }
@@ -517,14 +501,14 @@ exports.setInterval = function setInterval(callback, repeat, arg1, arg2, arg3) {
   active(timeout);
 
   return timeout;
-};
+}
 
-exports.clearInterval = function clearInterval(timer) {
+function clearInterval(timer) {
   // clearTimeout and clearInterval can be used to clear timers created from
   // both setTimeout and setInterval, as specified by HTML Living Standard:
   // https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#dom-setinterval
   clearTimeout(timer);
-};
+}
 
 
 Timeout.prototype.unref = function() {
@@ -739,10 +723,7 @@ setImmediate[internalUtil.promisify.custom] = function(value) {
   return new Promise((resolve) => new Immediate(resolve, [value]));
 };
 
-exports.setImmediate = setImmediate;
-
-
-exports.clearImmediate = function clearImmediate(immediate) {
+function clearImmediate(immediate) {
   if (!immediate || immediate._destroyed)
     return;
 
@@ -760,4 +741,23 @@ exports.clearImmediate = function clearImmediate(immediate) {
   immediate._onImmediate = null;
 
   immediateQueue.remove(immediate);
+}
+
+module.exports = {
+  _unrefActive,
+  active,
+  setTimeout,
+  clearTimeout,
+  setImmediate,
+  clearImmediate,
+  setInterval,
+  clearInterval,
+  unenroll: util.deprecate(
+    unenroll,
+    'timers.unenroll() is deprecated. Please use clearTimeout instead.',
+    'DEP0096'),
+  enroll: util.deprecate(
+    enroll,
+    'timers.enroll() is deprecated. Please use setTimeout instead.',
+    'DEP0095')
 };