readline: use module.exports = {} on internal/readline

PR-URL: https://github.com/nodejs/node/pull/12755
Reviewed-By: Anna Henningsen <anna@addaleax.net>

lib/internal/readline.js

@@ -7,15 +7,12 @@
 const ansi =
   /[\u001b\u009b][[()#;?]*(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-ORZcf-nqry=><]/g;
 
-
-module.exports = {
-  emitKeys,
-  stripVTControlCharacters
-};
+var getStringWidth;
+var isFullWidthCodePoint;
 
 if (process.binding('config').hasIntl) {
   const icu = process.binding('icu');
-  module.exports.getStringWidth = function getStringWidth(str, options) {
+  getStringWidth = function getStringWidth(str, options) {
     options = options || {};
     if (!Number.isInteger(str))
       str = stripVTControlCharacters(String(str));
@@ -23,7 +20,7 @@ if (process.binding('config').hasIntl) {
                               Boolean(options.ambiguousAsFullWidth),
                               Boolean(options.expandEmojiSequence));
   };
-  module.exports.isFullWidthCodePoint =
+  isFullWidthCodePoint =
     function isFullWidthCodePoint(code, options) {
       if (typeof code !== 'number')
         return false;
@@ -33,9 +30,9 @@ if (process.binding('config').hasIntl) {
   /**
    * Returns the number of columns required to display the given string.
    */
-  module.exports.getStringWidth = function getStringWidth(str) {
+  getStringWidth = function getStringWidth(str) {
     if (Number.isInteger(str))
-      return module.exports.isFullWidthCodePoint(str) ? 2 : 1;
+      return isFullWidthCodePoint(str) ? 2 : 1;
 
     let width = 0;
 
@@ -48,7 +45,7 @@ if (process.binding('config').hasIntl) {
         i++;
       }
 
-      if (module.exports.isFullWidthCodePoint(code)) {
+      if (isFullWidthCodePoint(code)) {
         width += 2;
       } else {
         width++;
@@ -62,7 +59,7 @@ if (process.binding('config').hasIntl) {
    * Returns true if the character represented by a given
    * Unicode code point is full-width. Otherwise returns false.
    */
-  module.exports.isFullWidthCodePoint = function isFullWidthCodePoint(code) {
+  isFullWidthCodePoint = function isFullWidthCodePoint(code) {
     if (!Number.isInteger(code)) {
       return false;
     }
@@ -407,3 +404,10 @@ function* emitKeys(stream) {
     /* Unrecognized or broken escape sequence, don't emit anything */
   }
 }
+
+module.exports = {
+  emitKeys,
+  getStringWidth,
+  isFullWidthCodePoint,
+  stripVTControlCharacters
+};