diff --git a/src/tsconfig.strictNullChecks.json b/src/tsconfig.strictNullChecks.json
index 5b2f189247f..7410f4dcc36 100644
--- a/src/tsconfig.strictNullChecks.json
+++ b/src/tsconfig.strictNullChecks.json
@@ -545,6 +545,7 @@
 		"./vs/vscode.d.ts",
 		"./vs/vscode.proposed.d.ts",
 		"./vs/workbench/api/node/extHostExtensionActivator.ts",
+		// "./vs/workbench/api/node/extHostTypes.ts",
 		"./vs/workbench/api/shared/tasks.ts",
 		"./vs/workbench/browser/actions/toggleActivityBarVisibility.ts",
 		"./vs/workbench/browser/actions/toggleCenteredLayout.ts",
@@ -729,4 +730,4 @@
 	"exclude": [
 		"./typings/require-monaco.d.ts"
 	]
-}
\ No newline at end of file
+}
diff --git a/src/vs/editor/common/modes.ts b/src/vs/editor/common/modes.ts
index 2b5eeb7623a..bb1af92f90d 100644
--- a/src/vs/editor/common/modes.ts
+++ b/src/vs/editor/common/modes.ts
@@ -876,7 +876,7 @@ export interface DocumentSymbolProvider {
 	provideDocumentSymbols(model: model.ITextModel, token: CancellationToken): ProviderResult<DocumentSymbol[]>;
 }
 
-export type TextEdit = { range: IRange; text: string; eol?: model.EndOfLineSequence; } | { range: undefined; text: undefined; eol: model.EndOfLineSequence; };
+export type TextEdit = { range: IRange; text: string; eol?: model.EndOfLineSequence; };
 
 /**
  * Interface used to format a model
diff --git a/src/vs/editor/common/services/editorSimpleWorker.ts b/src/vs/editor/common/services/editorSimpleWorker.ts
index 84590d69ace..ed3a564f52e 100644
--- a/src/vs/editor/common/services/editorSimpleWorker.ts
+++ b/src/vs/editor/common/services/editorSimpleWorker.ts
@@ -425,8 +425,8 @@ export abstract class BaseEditorSimpleWorker {
 				lastEol = eol;
 			}
 
-			if (!range) {
-				// eol-change only
+			if (Range.isEmpty(range) && !text) {
+				// empty change
 				continue;
 			}
 
@@ -463,7 +463,7 @@ export abstract class BaseEditorSimpleWorker {
 		}
 
 		if (typeof lastEol === 'number') {
-			result.push({ eol: lastEol, text: undefined, range: undefined });
+			result.push({ eol: lastEol, text: '', range: { startLineNumber: 0, startColumn: 0, endLineNumber: 0, endColumn: 0 } });
 		}
 
 		return Promise.resolve(result);
diff --git a/src/vs/monaco.d.ts b/src/vs/monaco.d.ts
index 54a6804c68d..d6ea545dd85 100644
--- a/src/vs/monaco.d.ts
+++ b/src/vs/monaco.d.ts
@@ -5148,10 +5148,6 @@ declare namespace monaco.languages {
 		range: IRange;
 		text: string;
 		eol?: editor.EndOfLineSequence;
-	} | {
-		range: undefined;
-		text: undefined;
-		eol: editor.EndOfLineSequence;
 	};
 
 	/**
diff --git a/src/vs/workbench/api/node/extHostTypes.ts b/src/vs/workbench/api/node/extHostTypes.ts
index f2a25b2a554..b7a22905277 100644
--- a/src/vs/workbench/api/node/extHostTypes.ts
+++ b/src/vs/workbench/api/node/extHostTypes.ts
@@ -447,7 +447,7 @@ export class TextEdit {
 	}
 
 	static setEndOfLine(eol: EndOfLine): TextEdit {
-		let ret = new TextEdit(undefined, undefined);
+		let ret = new TextEdit(new Range(new Position(0, 0), new Position(0, 0)), '');
 		ret.newEol = eol;
 		return ret;
 	}
@@ -513,8 +513,8 @@ export interface IFileOperationOptions {
 
 export interface IFileOperation {
 	_type: 1;
-	from: URI;
-	to: URI;
+	from?: URI;
+	to?: URI;
 	options?: IFileOperationOptions;
 }
 
@@ -567,7 +567,7 @@ export class WorkspaceEdit implements vscode.WorkspaceEdit {
 			for (let i = 0; i < this._edits.length; i++) {
 				const element = this._edits[i];
 				if (element._type === 2 && element.uri.toString() === uri.toString()) {
-					this._edits[i] = undefined;
+					this._edits[i] = undefined!; // will be coalesced down below
 				}
 			}
 			this._edits = coalesce(this._edits);
@@ -606,8 +606,8 @@ export class WorkspaceEdit implements vscode.WorkspaceEdit {
 		return values(textEdits);
 	}
 
-	_allEntries(): ([URI, TextEdit[]] | [URI, URI, IFileOperationOptions])[] {
-		let res: ([URI, TextEdit[]] | [URI, URI, IFileOperationOptions])[] = [];
+	_allEntries(): ([URI, TextEdit[]] | [URI?, URI?, IFileOperationOptions?])[] {
+		let res: ([URI, TextEdit[]] | [URI?, URI?, IFileOperationOptions?])[] = [];
 		for (let edit of this._edits) {
 			if (edit._type === 1) {
 				res.push([edit.from, edit.to, edit.options]);
@@ -938,7 +938,7 @@ export class SymbolInformation {
 		if (locationOrUri instanceof Location) {
 			this.location = locationOrUri;
 		} else if (rangeOrContainer instanceof Range) {
-			this.location = new Location(locationOrUri, rangeOrContainer);
+			this.location = new Location(locationOrUri!, rangeOrContainer);
 		}
 
 		SymbolInformation.validate(this);
@@ -1934,12 +1934,14 @@ export class FunctionBreakpoint extends Breakpoint {
 export class DebugAdapterExecutable implements vscode.DebugAdapterExecutable {
 	readonly command: string;
 	readonly args: string[];
-	readonly options?: vscode.DebugAdapterExecutableOptions;
+	readonly env?: { [key: string]: string };
+	readonly cwd?: string;
 
-	constructor(command: string, args: string[], options?: vscode.DebugAdapterExecutableOptions) {
+	constructor(command: string, args?: string[], env?: { [key: string]: string }, cwd?: string) {
 		this.command = command;
-		this.args = args || [];
-		this.options = options;
+		this.args = args;
+		this.env = env;
+		this.cwd = cwd;
 	}
 }