diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 305fa8844ea..278a189b8d6 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -22171,6 +22171,7 @@ namespace ts {
                 for (const decl of indexSymbol.declarations) {
                     const declaration = <SignatureDeclaration>decl;
                     if (declaration.parameters.length === 1 && declaration.parameters[0].type) {
+                        // tslint:disable-next-line
                         switch (declaration.parameters[0].type!.kind) {
                             case SyntaxKind.StringKeyword:
                                 if (!seenStringIndexer) {
diff --git a/src/services/jsDoc.ts b/src/services/jsDoc.ts
index 0d166459d98..813da5ba477 100644
--- a/src/services/jsDoc.ts
+++ b/src/services/jsDoc.ts
@@ -360,7 +360,8 @@ namespace ts.JsDoc {
                     const varStatement = <VariableStatement>commentOwner;
                     const varDeclarations = varStatement.declarationList.declarations;
                     const parameters = varDeclarations.length === 1 && varDeclarations[0].initializer
-                        ? getParametersFromRightHandSideOfAssignment(varDeclarations[0].initializer)
+                        // tslint:disable-next-line
+                        ? getParametersFromRightHandSideOfAssignment(varDeclarations[0].initializer!)
                         : undefined;
                     return { commentOwner, parameters };
                 }