Convert text-editor-registry and tests to JS

Signed-off-by: Max Brunsfeld <maxbrunsfeld@github.com>

src/text-editor-registry.coffee

@@ -1,52 +0,0 @@
-{Emitter, Disposable} = require 'event-kit'
-
-# Experimental: This global registry tracks registered `TextEditors`.
-#
-# If you want to add functionality to a wider set of text editors than just
-# those appearing within workspace panes, use `atom.textEditors.observe` to
-# invoke a callback for all current and future registered text editors.
-#
-# If you want packages to be able to add functionality to your non-pane text
-# editors (such as a search field in a custom user interface element), register
-# them for observation via `atom.textEditors.add`. **Important:** When you're
-# done using your editor, be sure to call `dispose` on the returned disposable
-# to avoid leaking editors.
-module.exports =
-class TextEditorRegistry
-  constructor: ->
-    @editors = new Set
-    @emitter = new Emitter
-
-  # Register a `TextEditor`.
-  #
-  # * `editor` The editor to register.
-  #
-  # Returns a {Disposable} on which `.dispose()` can be called to remove the
-  # added editor. To avoid any memory leaks this should be called when the
-  # editor is destroyed.
-  add: (editor) ->
-    @editors.add(editor)
-    editor.registered = true
-
-    @emitter.emit 'did-add-editor', editor
-    new Disposable => @remove(editor)
-
-  # Remove a `TextEditor`.
-  #
-  # * `editor` The editor to remove.
-  #
-  # Returns a {Boolean} indicating whether the editor was successfully removed.
-  remove: (editor) ->
-    removed = @editors.delete(editor)
-    editor.registered = false
-    removed
-
-  # Invoke the given callback with all the current and future registered
-  # `TextEditors`.
-  #
-  # * `callback` {Function} to be called with current and future text editors.
-  #
-  # Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
-  observe: (callback) ->
-    @editors.forEach(callback)
-    @emitter.on 'did-add-editor', callback

src/text-editor-registry.js

@@ -0,0 +1,58 @@
+/** @babel */
+
+import {Emitter, Disposable} from "event-kit"
+
+// Experimental: This global registry tracks registered `TextEditors`.
+//
+// If you want to add functionality to a wider set of text editors than just
+// those appearing within workspace panes, use `atom.textEditors.observe` to
+// invoke a callback for all current and future registered text editors.
+//
+// If you want packages to be able to add functionality to your non-pane text
+// editors (such as a search field in a custom user interface element), register
+// them for observation via `atom.textEditors.add`. **Important:** When you're
+// done using your editor, be sure to call `dispose` on the returned disposable
+// to avoid leaking editors.
+export default class TextEditorRegistry {
+  constructor () {
+    this.editors = new Set()
+    this.emitter = new Emitter()
+  }
+
+  // Register a `TextEditor`.
+  //
+  // * `editor` The editor to register.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to remove the
+  // added editor. To avoid any memory leaks this should be called when the
+  // editor is destroyed.
+  add (editor) {
+    this.editors.add(editor)
+    editor.registered = true
+    this.emitter.emit("did-add-editor", editor)
+
+    return new Disposable(() => this.remove(editor))
+  }
+
+  // Remove a `TextEditor`.
+  //
+  // * `editor` The editor to remove.
+  //
+  // Returns a {Boolean} indicating whether the editor was successfully removed.
+  remove (editor) {
+    var removed = this.editors.delete(editor)
+    editor.registered = false
+    return removed
+  }
+
+  // Invoke the given callback with all the current and future registered
+  // `TextEditors`.
+  //
+  // * `callback` {Function} to be called with current and future text editors.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
+  observe (callback) {
+    this.editors.forEach(callback)
+    return this.emitter.on("did-add-editor", callback)
+  }
+}