diff --git a/browser/src/Plugins/Api/Oni.ts b/browser/src/Plugins/Api/Oni.ts
index 282605f6db..d90b3bd379 100644
--- a/browser/src/Plugins/Api/Oni.ts
+++ b/browser/src/Plugins/Api/Oni.ts
@@ -10,7 +10,7 @@ import { Editor } from "./Editor"
 import { StatusBar } from "./StatusBar"
 
 import { DebouncedLanguageService } from "./DebouncedLanguageService"
-import { InitializationParamsCreator, LanguageClient, ServerRunOptions } from "./LanguageClient/LanguageClient"
+import { InitializationParamsCreator, LanguageClient } from "./LanguageClient/LanguageClient"
 
 import { Services } from "./Services"
 import { Ui } from "./Ui"
@@ -87,8 +87,8 @@ export class Oni extends EventEmitter implements Oni.Plugin.Api {
         })
     }
 
-    public createLanguageClient(startOptions: ServerRunOptions, initializationParamsCreator: InitializationParamsCreator): LanguageClient {
-        return new LanguageClient(startOptions, initializationParamsCreator, this)
+    public createLanguageClient(initializationCommand: string, initializationParamsCreator: InitializationParamsCreator): LanguageClient {
+        return new LanguageClient(initializationCommand, initializationParamsCreator, this)
     }
 
     public registerLanguageService(languageService: Oni.Plugin.LanguageService): void {
diff --git a/browser/src/UI/components/AutoCompletion.tsx b/browser/src/UI/components/AutoCompletion.tsx
index c4482146b8..7d447c9f5f 100644
--- a/browser/src/UI/components/AutoCompletion.tsx
+++ b/browser/src/UI/components/AutoCompletion.tsx
@@ -31,7 +31,7 @@ export class AutoCompletion extends React.Component<IAutoCompletionProps, void>
             return null
         }
 
-        const containerStyle: React.CSSProperties = {
+        const containerStyle = {
             position: "absolute",
             top: this.props.y.toString() + "px",
             left: this.props.x.toString() + "px",
diff --git a/browser/src/UI/components/BufferScrollBar.tsx b/browser/src/UI/components/BufferScrollBar.tsx
index 98b91bb16c..7c491153af 100644
--- a/browser/src/UI/components/BufferScrollBar.tsx
+++ b/browser/src/UI/components/BufferScrollBar.tsx
@@ -39,7 +39,7 @@ export class BufferScrollBar extends React.PureComponent<IBufferScrollBarProps,
         const windowHeight = ((this.props.windowBottomLine - this.props.windowTopLine + 1) / this.props.bufferSize) * this.props.height
         const windowTop = ((this.props.windowTopLine - 1) / this.props.bufferSize) * this.props.height
 
-        const windowStyle: React.CSSProperties  = {
+        const windowStyle = {
             top: windowTop + "px",
             height: windowHeight + "px",
         }
@@ -51,7 +51,7 @@ export class BufferScrollBar extends React.PureComponent<IBufferScrollBarProps,
             const pos = (line / this.props.bufferSize) * this.props.height
             const size = "2px"
 
-            const markerStyle: React.CSSProperties = {
+            const markerStyle = {
                 position: "absolute",
                 top: pos + "px",
                 height: size,
diff --git a/browser/src/UI/components/Cursor.tsx b/browser/src/UI/components/Cursor.tsx
index 4eaa26f4d5..2df4e27b57 100644
--- a/browser/src/UI/components/Cursor.tsx
+++ b/browser/src/UI/components/Cursor.tsx
@@ -28,7 +28,7 @@ class CursorRenderer extends React.Component<ICursorProps, void> {
         const width = isNormalMode ? this.props.width : this.props.width / 4
         const characterToShow = isNormalMode ? this.props.character : ""
 
-        const cursorStyle: React.CSSProperties = {
+        const cursorStyle = {
             position: "absolute",
             left: this.props.x.toString() + "px",
             top: this.props.y.toString() + "px",
diff --git a/browser/src/UI/components/CursorLine.tsx b/browser/src/UI/components/CursorLine.tsx
index fae6cbb409..de7c9d50df 100644
--- a/browser/src/UI/components/CursorLine.tsx
+++ b/browser/src/UI/components/CursorLine.tsx
@@ -28,7 +28,7 @@ class CursorLineRenderer extends React.Component<ICursorLineRendererProps, void>
 
         const width = this.props.width
 
-        const cursorStyle: React.CSSProperties = {
+        const cursorStyle = {
             position: "absolute",
             left: this.props.x.toString() + "px", // Window Start
             top: this.props.y.toString() + "px", // Same as cursor
diff --git a/browser/src/UI/components/LiveEvalMarker.tsx b/browser/src/UI/components/LiveEvalMarker.tsx
index 835549b6aa..1ef9bed308 100644
--- a/browser/src/UI/components/LiveEvalMarker.tsx
+++ b/browser/src/UI/components/LiveEvalMarker.tsx
@@ -49,7 +49,7 @@ export class LiveEvalMarker extends React.Component<ILiveEvalMarkerProps, void>
 
         const cssClasses = classNames("live-eval-marker", { "evaluating": this._isEvaluating() }, { "error": this._hasError() })
 
-        const positionDivStyles: React.CSSProperties = {
+        const positionDivStyles = {
             position: "absolute",
             top: this.props.y.toString() + "px",
             right: "0px",
diff --git a/browser/src/UI/components/Logs.tsx b/browser/src/UI/components/Logs.tsx
index ef0402b9cb..d7292d2f71 100644
--- a/browser/src/UI/components/Logs.tsx
+++ b/browser/src/UI/components/Logs.tsx
@@ -26,7 +26,7 @@ export class LogsRenderer extends React.Component<ILogsProps, void> {
         // TODO copy details to clipboard
         if (!this.props.visible) { return null }
 
-        const maxHeightStyle: React.CSSProperties = {
+        const maxHeightStyle = {
             "height": "25vh",
             "maxHeight": "25vh",
             "overflow": "auto",
diff --git a/browser/src/UI/components/QuickInfo.tsx b/browser/src/UI/components/QuickInfo.tsx
index 6edc7e9670..cae2b936b3 100644
--- a/browser/src/UI/components/QuickInfo.tsx
+++ b/browser/src/UI/components/QuickInfo.tsx
@@ -24,29 +24,29 @@ export class QuickInfo extends React.Component<IQuickInfoProps, void> {
 
         const openFromTop = this.props.openFromTop || false
 
-        const containerStyle: React.CSSProperties = {
+        const containerStyle = {
             position: "absolute",
             top: this.props.y.toString() + "px",
             left: this.props.x.toString() + "px",
         }
 
-        const innerCommonStyle: React.CSSProperties = {
+        const innerCommonStyle = {
             "position": "absolute",
             "opacity": this.props.visible ? 1 : 0,
             "max-width": (document.body.offsetWidth - this.props.x - 40) + "px",
         }
 
-        const openFromTopStyle: React.CSSProperties = {
+        const openFromTopStyle = {
             ...innerCommonStyle,
             "top": "0px",
         }
 
-        const openFromBottomStyle: React.CSSProperties = {
+        const openFromBottomStyle = {
             ...innerCommonStyle,
             "bottom": "0px",
         }
 
-        const innerStyle: React.CSSProperties = openFromTop ? openFromTopStyle : openFromBottomStyle
+        const innerStyle = openFromTop ? openFromTopStyle : openFromBottomStyle
 
         return <div key={"quickinfo-container"} className="quickinfo-container enable-mouse" style={containerStyle}>
             <div key={"quickInfo"} style={innerStyle} className="quickinfo">
diff --git a/browser/src/neovim/NeovimInstance.ts b/browser/src/neovim/NeovimInstance.ts
index efe57059e7..bad9149fba 100644
--- a/browser/src/neovim/NeovimInstance.ts
+++ b/browser/src/neovim/NeovimInstance.ts
@@ -228,11 +228,11 @@ export class NeovimInstance extends EventEmitter implements INeovimInstance {
         return this._neovim.request("nvim_eval", [expression])
     }
 
-    public command(command: string): Promise<void> {
+    public command(command: string): Promise<any> {
         return this._neovim.request("nvim_command", [command])
     }
 
-    public callFunction(functionName: string, args: any[]): Promise<void> {
+    public callFunction(functionName: string, args: any[]): Promise<any> {
         return this._neovim.request("nvim_call_function", [functionName, args])
     }
 
diff --git a/definitions/Oni.d.ts b/definitions/Oni.d.ts
index aaccebff4b..5cf153349a 100644
--- a/definitions/Oni.d.ts
+++ b/definitions/Oni.d.ts
@@ -151,7 +151,7 @@ declare namespace Oni {
             editor: Editor
             statusBar: StatusBar
 
-            registerLanguageService(languageService: LanguageService)
+            registerLanguageService(languageType: string, languageService: LanguageService)
 
             clearHighlights(file: string, key: string)
             setHighlights(file: string, key: string, highlights: SyntaxHighlight[])
diff --git a/package.json b/package.json
index f0d6b14ffa..b547ac89d4 100644
--- a/package.json
+++ b/package.json
@@ -103,7 +103,7 @@
     "omnisharp-client": "7.0.6",
     "q": "1.4.1",
     "tslint": "4.0.2",
-    "typescript": "2.4.1"
+    "typescript": "2.2.1"
   },
   "devDependencies": {
     "@types/classnames": "0.0.32",
@@ -116,7 +116,7 @@
     "@types/msgpack-lite": "0.1.4",
     "@types/node": "6.0.48",
     "@types/q": "0.0.32",
-    "@types/react": "15.0.30",
+    "@types/react": "0.14.48",
     "@types/react-dom": "0.14.18",
     "@types/react-redux": "4.4.38",
     "@types/sinon": "1.16.32",
@@ -152,7 +152,7 @@
     "sinon": "1.17.6",
     "spectron": "3.6.2",
     "style-loader": "0.13.1",
-    "ts-loader": "2.2.2",
+    "ts-loader": "1.2.2",
     "vscode-jsonrpc": "3.3.1",
     "vscode-languageserver-types": "3.3.0",
     "wcwidth": "1.0.1",