fix: memoize this.emitter

Author: aminya

lib/decoration-management.js

@@ -19,13 +19,15 @@ export default class DecorationManagement {
   initializeDecorations (minimap) {
     this.minimap = minimap
 
-    if (this.minimap.emitter == null) {
+    if (this.emitter == null) {
       /**
        * The minimap emitter, lazily created if not created yet.
        * @type {Emitter}
        * @access private
        */
-      this.minimap.emitter = new Emitter()
+      this.emitter = new Emitter()
+    } else {
+      this.emitter = this.minimap.emitter
     }
 
     /**
@@ -92,7 +94,7 @@ export default class DecorationManagement {
    * @return {Disposable} a disposable to stop listening to the event
    */
   onDidAddDecoration (callback) {
-    return this.minimap.emitter.on('did-add-decoration', callback)
+    return this.emitter.on('did-add-decoration', callback)
   }
 
   /**
@@ -108,7 +110,7 @@ export default class DecorationManagement {
    * @return {Disposable} a disposable to stop listening to the event
    */
   onDidRemoveDecoration (callback) {
-    return this.minimap.emitter.on('did-remove-decoration', callback)
+    return this.emitter.on('did-remove-decoration', callback)
   }
 
   /**
@@ -127,7 +129,7 @@ export default class DecorationManagement {
    * @return {Disposable} a disposable to stop listening to the event
    */
   onDidChangeDecoration (callback) {
-    return this.minimap.emitter.on('did-change-decoration', callback)
+    return this.emitter.on('did-change-decoration', callback)
   }
 
   /**
@@ -146,7 +148,7 @@ export default class DecorationManagement {
    * @return {Disposable} a disposable to stop listening to the event
    */
   onDidChangeDecorationRange (callback) {
-    return this.minimap.emitter.on('did-change-decoration-range', callback)
+    return this.emitter.on('did-change-decoration-range', callback)
   }
 
   /**
@@ -160,7 +162,7 @@ export default class DecorationManagement {
    * @return {Disposable} a disposable to stop listening to the event
    */
   onDidUpdateDecoration (callback) {
-    return this.minimap.emitter.on('did-update-decoration', callback)
+    return this.emitter.on('did-update-decoration', callback)
   }
 
   /**
@@ -357,7 +359,7 @@ export default class DecorationManagement {
           if (decorations !== undefined) {
             for (let i = 0, len = decorations.length; i < len; i++) {
               const decoration = decorations[i]
-              this.minimap.emitter.emit('did-change-decoration', {
+              this.emitter.emit('did-change-decoration', {
                 marker,
                 decoration,
                 event
@@ -416,7 +418,7 @@ export default class DecorationManagement {
       }))
 
     this.emitDecorationChanges(type, decoration)
-    this.minimap.emitter.emit('did-add-decoration', {
+    this.emitter.emit('did-add-decoration', {
       marker,
       decoration
     })
@@ -470,7 +472,7 @@ export default class DecorationManagement {
       type
     }
 
-    this.minimap.emitter.emit('did-change-decoration-range', changeEvent)
+    this.emitter.emit('did-change-decoration-range', changeEvent)
   }
 
   /**
@@ -506,7 +508,7 @@ export default class DecorationManagement {
     if (index > -1) {
       decorations.splice(index, 1)
 
-      this.minimap.emitter.emit('did-remove-decoration', {
+      this.emitter.emit('did-remove-decoration', {
         marker,
         decoration
       })
@@ -536,7 +538,7 @@ export default class DecorationManagement {
       if (!this.minimap.editorDestroyed()) {
         this.emitDecorationChanges(decoration.getProperties().type, decoration)
       }
-      this.minimap.emitter.emit('did-remove-decoration', {
+      this.emitter.emit('did-remove-decoration', {
         marker,
         decoration
       })