fixup: don't early assign the value

lib/readline.js

@@ -407,10 +407,9 @@ Interface.prototype._normalWrite = function(b) {
   if (b === undefined) {
     return;
   }
-  const now = Date.now();
   var string = this._decoder.write(b);
   if (this._sawReturnAt &&
-      now - this._sawReturnAt <= this.crlfDelay) {
+      Date.now() - this._sawReturnAt <= this.crlfDelay) {
     string = string.replace(/^\n/, '');
     this._sawReturnAt = 0;
   }
@@ -423,7 +422,7 @@ Interface.prototype._normalWrite = function(b) {
     this._line_buffer = null;
   }
   if (newPartContainsEnding) {
-    this._sawReturnAt = string.endsWith('\r') ? now : 0;
+    this._sawReturnAt = string.endsWith('\r') ? Date.now() : 0;
 
     // got one or more newlines; process into "line" events
     var lines = string.split(lineEnding);
@@ -910,22 +909,20 @@ Interface.prototype._ttyWrite = function(s, key) {
   } else {
     /* No modifier keys used */
 
-    const now = Date.now();
-
     // \r bookkeeping is only relevant if a \n comes right after.
     if (this._sawReturnAt && key.name !== 'enter')
       this._sawReturnAt = 0;
 
     switch (key.name) {
       case 'return':  // carriage return, i.e. \r
-        this._sawReturnAt = now;
+        this._sawReturnAt = Date.now();
         this._line();
         break;
 
       case 'enter':
         // When key interval > crlfDelay
         if (this._sawReturnAt === 0 ||
-            now - this._sawReturnAt > this.crlfDelay) {
+            Date.now() - this._sawReturnAt > this.crlfDelay) {
           this._line();
         }
         this._sawReturnAt = 0;