diff --git a/client/package.json b/client/package.json
index 27d4518b0..9680437c6 100644
--- a/client/package.json
+++ b/client/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "vscode-languageclient",
 	"description": "VSCode Language client implementation",
-	"version": "3.2.0-alpha.2",
+	"version": "3.2.0-alpha.3",
 	"author": "Microsoft Corporation",
 	"license": "MIT",
 	"engines": {
diff --git a/client/src/main.ts b/client/src/main.ts
index 99127483b..7f7634efa 100644
--- a/client/src/main.ts
+++ b/client/src/main.ts
@@ -884,9 +884,7 @@ export class LanguageClient {
 
 		clientOptions = clientOptions || {};
 		this._clientOptions = {
-			documentSelector: is.typedArray<string>(clientOptions.documentSelector, is.string)
-				? clientOptions.documentSelector.map(element => { return { language: element }; })
-				: clientOptions.documentSelector,
+			documentSelector: clientOptions.documentSelector || [],
 			synchronize: clientOptions.synchronize || {},
 			diagnosticCollectionName: clientOptions.diagnosticCollectionName,
 			outputChannelName: clientOptions.outputChannelName || this._name,
@@ -1440,6 +1438,7 @@ export class LanguageClient {
 		}
 		if (json.module) {
 			let node: NodeModule = <NodeModule>json;
+			let transport = node.transport || TransportKind.stdio;
 			if (node.runtime) {
 				let args: string[] = [];
 				let options: ForkOptions = node.options || Object.create(null);
@@ -1454,30 +1453,30 @@ export class LanguageClient {
 				execOptions.cwd = options.cwd || Workspace.rootPath;
 				execOptions.env = getEnvironment(options.env);
 				let pipeName: string | undefined = undefined;
-				if (node.transport === TransportKind.ipc) {
+				if (transport === TransportKind.ipc) {
 					// exec options not correctly typed in lib
 					execOptions.stdio = <any>[null, null, null, 'ipc'];
 					args.push('--node-ipc');
-				} else if (node.transport === TransportKind.stdio) {
+				} else if (transport === TransportKind.stdio) {
 					args.push('--stdio');
-				} else if (node.transport === TransportKind.pipe) {
+				} else if (transport === TransportKind.pipe) {
 					pipeName = generateRandomPipeName();
 					args.push(`--pipe=${pipeName}`);
 				}
-				if (node.transport === TransportKind.ipc || node.transport === TransportKind.stdio) {
+				if (transport === TransportKind.ipc || transport === TransportKind.stdio) {
 					let process = cp.spawn(node.runtime, args, execOptions);
 					if (!process || !process.pid) {
 						return Promise.reject<IConnection>(`Launching server using runtime ${node.runtime} failed.`);
 					}
 					this._childProcess = process;
 					process.stderr.on('data', data => this.outputChannel.append(is.string(data) ? data : data.toString(encoding)));
-					if (node.transport === TransportKind.ipc) {
+					if (transport === TransportKind.ipc) {
 						process.stdout.on('data', data => this.outputChannel.append(is.string(data) ? data : data.toString(encoding)));
 						return Promise.resolve(createConnection(new IPCMessageReader(process), new IPCMessageWriter(process), errorHandler, closeHandler));
 					} else {
 						return Promise.resolve(createConnection(process.stdout, process.stdin, errorHandler, closeHandler));
 					}
-				} else if (node.transport == TransportKind.pipe) {
+				} else if (transport == TransportKind.pipe) {
 					return createClientPipeTransport(pipeName!).then((transport) => {
 						let process = cp.spawn(node.runtime!, args, execOptions);
 						if (!process || !process.pid) {
@@ -1495,25 +1494,25 @@ export class LanguageClient {
 				let pipeName: string | undefined = undefined;
 				return new Promise<IConnection>((resolve, reject) => {
 					let args = node.args && node.args.slice() || [];
-					if (node.transport === TransportKind.ipc) {
+					if (transport === TransportKind.ipc) {
 						args.push('--node-ipc');
-					} else if (node.transport === TransportKind.stdio) {
+					} else if (transport === TransportKind.stdio) {
 						args.push('--stdio');
-					} else if (node.transport === TransportKind.pipe) {
+					} else if (transport === TransportKind.pipe) {
 						pipeName = generateRandomPipeName();
 						args.push(`--pipe=${pipeName}`);
 					}
 					let options: ForkOptions = node.options || Object.create(null);
 					options.execArgv = options.execArgv || [];
 					options.cwd = options.cwd || Workspace.rootPath;
-					if (node.transport === TransportKind.ipc || node.transport === TransportKind.stdio) {
+					if (transport === TransportKind.ipc || transport === TransportKind.stdio) {
 						electron.fork(node.module, args || [], options, (error, cp) => {
 							if (error || !cp) {
 								reject(error);
 							} else {
 								this._childProcess = cp;
 								cp.stderr.on('data', data => this.outputChannel.append(is.string(data) ? data : data.toString(encoding)));
-								if (node.transport === TransportKind.ipc) {
+								if (transport === TransportKind.ipc) {
 									cp.stdout.on('data', data => this.outputChannel.append(is.string(data) ? data : data.toString(encoding)));
 									resolve(createConnection(new IPCMessageReader(this._childProcess), new IPCMessageWriter(this._childProcess), errorHandler, closeHandler));
 								} else {
@@ -1521,7 +1520,7 @@ export class LanguageClient {
 								}
 							}
 						});
-					}  else if (node.transport === TransportKind.pipe) {
+					}  else if (transport === TransportKind.pipe) {
 						createClientPipeTransport(pipeName!).then((transport) => {
 							electron.fork(node.module, args || [], options, (error, cp) => {
 								if (error || !cp) {
diff --git a/client/src/protocol.ts b/client/src/protocol.ts
index 649f9d14a..c62b095c7 100644
--- a/client/src/protocol.ts
+++ b/client/src/protocol.ts
@@ -4,6 +4,8 @@
  * ------------------------------------------------------------------------------------------ */
 'use strict';
 
+import * as Is from './utils/is';
+
 import { RequestType, RequestType0, NotificationType, NotificationType0 } from 'vscode-jsonrpc';
 
 import {
@@ -23,21 +25,34 @@ import {
  * @sample A language filter that applies to typescript files on disk: `{ language: 'typescript', scheme: 'file' }`
  * @sample A language filter that applies to all package.json paths: `{ language: 'json', pattern: '**package.json' }`
  */
-export interface DocumentFilter {
-	/**
-	 * A language id, like `typescript`.
-	 */
-	language?: string;
-
-	/**
-	 * A Uri [scheme](#Uri.scheme), like `file` or `untitled`.
-	 */
+export type DocumentFilter = {
+	/** A language id, like `typescript`. */
+	language: string;
+	/** A Uri [scheme](#Uri.scheme), like `file` or `untitled`. */
 	scheme?: string;
-
-	/**
-	 * A glob pattern, like `*.{ts,js}`.
-	 */
+	/** A glob pattern, like `*.{ts,js}`. */
+	pattern?: string;
+} | {
+	/** A language id, like `typescript`. */
+	language?: string;
+	/** A Uri [scheme](#Uri.scheme), like `file` or `untitled`. */
+	scheme: string;
+	/** A glob pattern, like `*.{ts,js}`. */
 	pattern?: string;
+} | {
+	/** A language id, like `typescript`. */
+	language?: string;
+	/** A Uri [scheme](#Uri.scheme), like `file` or `untitled`. */
+	scheme?: string;
+	/** A glob pattern, like `*.{ts,js}`. */
+	pattern: string;
+};
+
+export namespace DocumentFilter {
+	export function is(value: any): value is DocumentFilter {
+		let candidate: DocumentFilter = value;
+		return Is.string(candidate.language) || Is.string(candidate.scheme) || Is.string(candidate.pattern);
+	}
 }
 
 /**
@@ -45,7 +60,7 @@ export interface DocumentFilter {
  *
  * @sample `let sel:DocumentSelector = [{ language: 'typescript' }, { language: 'json', pattern: '**∕tsconfig.json' }]`;
  */
-export type DocumentSelector = DocumentFilter[];
+export type DocumentSelector = (string | DocumentFilter)[];
 
 /**
  * General paramters to to regsiter for an notification or to register a provider.
diff --git a/server/package.json b/server/package.json
index 879a31884..fb373084a 100644
--- a/server/package.json
+++ b/server/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "vscode-languageserver",
 	"description": "Language server implementation for node",
-	"version": "3.2.0-alpha.1",
+	"version": "3.2.0-alpha.4",
 	"author": "Microsoft Corporation",
 	"license": "MIT",
 	"repository": {
diff --git a/server/src/protocol.ts b/server/src/protocol.ts
index 649f9d14a..c62b095c7 100644
--- a/server/src/protocol.ts
+++ b/server/src/protocol.ts
@@ -4,6 +4,8 @@
  * ------------------------------------------------------------------------------------------ */
 'use strict';
 
+import * as Is from './utils/is';
+
 import { RequestType, RequestType0, NotificationType, NotificationType0 } from 'vscode-jsonrpc';
 
 import {
@@ -23,21 +25,34 @@ import {
  * @sample A language filter that applies to typescript files on disk: `{ language: 'typescript', scheme: 'file' }`
  * @sample A language filter that applies to all package.json paths: `{ language: 'json', pattern: '**package.json' }`
  */
-export interface DocumentFilter {
-	/**
-	 * A language id, like `typescript`.
-	 */
-	language?: string;
-
-	/**
-	 * A Uri [scheme](#Uri.scheme), like `file` or `untitled`.
-	 */
+export type DocumentFilter = {
+	/** A language id, like `typescript`. */
+	language: string;
+	/** A Uri [scheme](#Uri.scheme), like `file` or `untitled`. */
 	scheme?: string;
-
-	/**
-	 * A glob pattern, like `*.{ts,js}`.
-	 */
+	/** A glob pattern, like `*.{ts,js}`. */
+	pattern?: string;
+} | {
+	/** A language id, like `typescript`. */
+	language?: string;
+	/** A Uri [scheme](#Uri.scheme), like `file` or `untitled`. */
+	scheme: string;
+	/** A glob pattern, like `*.{ts,js}`. */
 	pattern?: string;
+} | {
+	/** A language id, like `typescript`. */
+	language?: string;
+	/** A Uri [scheme](#Uri.scheme), like `file` or `untitled`. */
+	scheme?: string;
+	/** A glob pattern, like `*.{ts,js}`. */
+	pattern: string;
+};
+
+export namespace DocumentFilter {
+	export function is(value: any): value is DocumentFilter {
+		let candidate: DocumentFilter = value;
+		return Is.string(candidate.language) || Is.string(candidate.scheme) || Is.string(candidate.pattern);
+	}
 }
 
 /**
@@ -45,7 +60,7 @@ export interface DocumentFilter {
  *
  * @sample `let sel:DocumentSelector = [{ language: 'typescript' }, { language: 'json', pattern: '**∕tsconfig.json' }]`;
  */
-export type DocumentSelector = DocumentFilter[];
+export type DocumentSelector = (string | DocumentFilter)[];
 
 /**
  * General paramters to to regsiter for an notification or to register a provider.