diff --git a/build/monaco/api.js b/build/monaco/api.js
index ae4a0d26616..96581b76dad 100644
--- a/build/monaco/api.js
+++ b/build/monaco/api.js
@@ -115,7 +115,7 @@ function getAllTopLevelDeclarations(sourceFile) {
 function getTopLevelDeclaration(sourceFile, typeName) {
     var result = null;
     visitTopLevelDeclarations(sourceFile, function (node) {
-        if (isDeclaration(node)) {
+        if (isDeclaration(node) && node.name) {
             if (node.name.text === typeName) {
                 result = node;
                 return true /*stop*/;
@@ -308,7 +308,7 @@ function generateDeclarationFile(out, inputFiles, recipe) {
                 typesToExcludeArr_1.push(typeName);
             });
             getAllTopLevelDeclarations(sourceFile_2).forEach(function (declaration) {
-                if (isDeclaration(declaration)) {
+                if (isDeclaration(declaration) && declaration.name) {
                     if (typesToExcludeMap_1[declaration.name.text]) {
                         return;
                     }
diff --git a/build/monaco/api.ts b/build/monaco/api.ts
index 64ca2243b58..402371af8d4 100644
--- a/build/monaco/api.ts
+++ b/build/monaco/api.ts
@@ -32,7 +32,7 @@ function moduleIdToPath(out: string, moduleId: string): string {
 }
 
 let SOURCE_FILE_MAP: { [moduleId: string]: ts.SourceFile; } = {};
-function getSourceFile(out: string, inputFiles: { [file: string]: string; }, moduleId: string): ts.SourceFile {
+function getSourceFile(out: string, inputFiles: { [file: string]: string; }, moduleId: string): ts.SourceFile | null {
 	if (!SOURCE_FILE_MAP[moduleId]) {
 		let filePath = path.normalize(moduleIdToPath(out, moduleId));
 
@@ -128,10 +128,10 @@ function getAllTopLevelDeclarations(sourceFile: ts.SourceFile): TSTopLevelDeclar
 }
 
 
-function getTopLevelDeclaration(sourceFile: ts.SourceFile, typeName: string): TSTopLevelDeclare {
-	let result: TSTopLevelDeclare = null;
+function getTopLevelDeclaration(sourceFile: ts.SourceFile, typeName: string): TSTopLevelDeclare | null {
+	let result: TSTopLevelDeclare | null = null;
 	visitTopLevelDeclarations(sourceFile, (node) => {
-		if (isDeclaration(node)) {
+		if (isDeclaration(node) && node.name) {
 			if (node.name.text === typeName) {
 				result = node;
 				return true /*stop*/;
@@ -153,7 +153,7 @@ function getNodeText(sourceFile: ts.SourceFile, node: { pos: number; end: number
 	return sourceFile.getFullText().substring(node.pos, node.end);
 }
 
-function hasModifier(modifiers: ts.NodeArray<ts.Modifier>, kind: ts.SyntaxKind): boolean {
+function hasModifier(modifiers: ts.NodeArray<ts.Modifier> | undefined, kind: ts.SyntaxKind): boolean {
 	if (modifiers) {
 		for (let i = 0; i < modifiers.length; i++) {
 			let mod = modifiers[i];
@@ -188,7 +188,7 @@ function getMassagedTopLevelDeclarationText(sourceFile: ts.SourceFile, declarati
 		const staticTypeName = (
 			isDefaultExport(interfaceDeclaration)
 				? `${importName}.default`
-				: `${importName}.${declaration.name.text}`
+				: `${importName}.${declaration.name!.text}`
 		);
 
 		let instanceTypeName = staticTypeName;
@@ -307,7 +307,7 @@ function generateDeclarationFile(out: string, inputFiles: { [file: string]: stri
 		if (m1) {
 			CURRENT_PROCESSING_RULE = line;
 			let moduleId = m1[1];
-			let sourceFile = getSourceFile(out, inputFiles, moduleId);
+			const sourceFile = getSourceFile(out, inputFiles, moduleId);
 			if (!sourceFile) {
 				return;
 			}
@@ -336,7 +336,7 @@ function generateDeclarationFile(out: string, inputFiles: { [file: string]: stri
 		if (m2) {
 			CURRENT_PROCESSING_RULE = line;
 			let moduleId = m2[1];
-			let sourceFile = getSourceFile(out, inputFiles, moduleId);
+			const sourceFile = getSourceFile(out, inputFiles, moduleId);
 			if (!sourceFile) {
 				return;
 			}
@@ -358,7 +358,7 @@ function generateDeclarationFile(out: string, inputFiles: { [file: string]: stri
 			});
 
 			getAllTopLevelDeclarations(sourceFile).forEach((declaration) => {
-				if (isDeclaration(declaration)) {
+				if (isDeclaration(declaration) && declaration.name) {
 					if (typesToExcludeMap[declaration.name.text]) {
 						return;
 					}
@@ -395,7 +395,7 @@ function generateDeclarationFile(out: string, inputFiles: { [file: string]: stri
 function getIncludesInRecipe(): string[] {
 	let recipe = fs.readFileSync(RECIPE_PATH).toString();
 	let lines = recipe.split(/\r\n|\n|\r/);
-	let result = [];
+	let result: string[] = [];
 
 	lines.forEach(line => {
 
@@ -478,7 +478,7 @@ class TypeScriptLanguageServiceHost implements ts.LanguageServiceHost {
 	}
 	getScriptFileNames(): string[] {
 		return (
-			[]
+			([] as string[])
 				.concat(Object.keys(this._libs))
 				.concat(Object.keys(this._files))
 		);