Revert "lib: repl multiline history support"

This reverts commit dd7a3d246ded89cd0c910231c9adec279e72f9a9.

PR-URL: https://github.com/nodejs/node/pull/24804
Refs: https://github.com/nodejs/node/issues/24231
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

lib/readline.js

@@ -225,7 +225,6 @@ function Interface(input, output, completer, terminal) {
 
     // Current line
     this.line = '';
-    this.multiline = '';
 
     this._setRawMode(true);
     this.terminal = true;
@@ -337,7 +336,6 @@ Interface.prototype._addHistory = function() {
       if (dupIndex !== -1) this.history.splice(dupIndex, 1);
     }
 
-    this.multiline += this.line;
     this.history.unshift(this.line);
 
     // Only store so many
@@ -348,29 +346,6 @@ Interface.prototype._addHistory = function() {
   return this.history[0];
 };
 
-// Called when a multiline is seen by the repl
-Interface.prototype.undoHistory = function() {
-  if (this.terminal) {
-    this.history.shift();
-  }
-};
-
-// If it's a multiline code, then add history
-// accordingly.
-Interface.prototype.multilineHistory = function() {
-  // check if we got a multiline code
-  if (this.multiline !== '' && this.terminal) {
-    const dupIndex = this.history.indexOf(this.multiline);
-    if (dupIndex !== -1) this.history.splice(dupIndex, 1);
-    // Remove the last entered line as multiline
-    // already contains them.
-    this.history.shift();
-    this.history.unshift(this.multiline);
-  }
-
-  // clear the multiline buffer
-  this.multiline = '';
-};
 
 Interface.prototype._refreshLine = function() {
   // line length

lib/repl.js

@@ -774,7 +774,6 @@ exports.start = function(prompt,
 
 REPLServer.prototype.clearBufferedCommand = function clearBufferedCommand() {
   this[kBufferedCommandSymbol] = '';
-  REPLServer.super_.prototype.multilineHistory.call(this);
 };
 
 REPLServer.prototype.close = function close() {
@@ -889,7 +888,6 @@ REPLServer.prototype.displayPrompt = function(preserveCursor) {
     const len = this.lines.level.length ? this.lines.level.length - 1 : 0;
     const levelInd = '..'.repeat(len);
     prompt += levelInd + ' ';
-    Interface.prototype.undoHistory.call(this);
   }
 
   // Do not overwrite `_initialPrompt` here

test/parallel/test-repl-persistent-history.js

@@ -111,13 +111,6 @@ const tests = [
     test: [UP],
     expected: [prompt, replFailedRead, prompt, replDisabled, prompt]
   },
-  { // Tests multiline history
-    env: {},
-    test: ['{', '}', UP, CLEAR],
-    expected: [prompt, '{', '... ', '}', '{}\n',
-               prompt, `${prompt}{}`, prompt],
-    clean: false
-  },
   {
     before: function before() {
       if (common.isWindows) {