diff --git a/dojo-typings/src/main/typings/dijit/dijit.d.ts b/dojo-typings/src/main/typings/dijit/dijit.d.ts
--- a/dojo-typings/src/main/typings/dijit/dijit.d.ts
+++ b/dojo-typings/src/main/typings/dijit/dijit.d.ts
@@ -622,24 +622,24 @@ declare namespace dijit {
          * Value must be among the list of locales specified during by the Dojo bootstrap,
          * formatted according to [RFC 3066](http://www.ietf.org/rfc/rfc3066.txt) (like en-us).
          */
-        lang: string;
+        lang?: string;
 
         /**
          * Bi-directional support, as defined by the [HTML DIR](http://www.w3.org/TR/html401/struct/dirlang.html#adef-dir)
          * attribute. Either left-to-right "ltr" or right-to-left "rtl".  If undefined, widgets renders in page's
          * default direction.
          */
-        dir: string;
+        dir?: string;
 
         /**
          * HTML class attribute
          */
-        class: string;
+        class?: string;
 
         /**
          * HTML style attributes as cssText string or name/value hash
          */
-        style: string;
+        style?: string;
 
         /**
          * HTML title attribute.
@@ -651,13 +651,13 @@ declare namespace dijit {
          * etc., it's used to specify the tab label, accordion pane title, etc.  In this case it's
          * interpreted as HTML.
          */
-        title: string;
+        title?: string;
 
         /**
          * When this widget's title attribute is used to for a tab label, accordion pane title, etc.,
          * this specifies the tooltip to appear when the mouse is hovered over that text.
          */
-        tooltip: string;
+        tooltip?: string;
 
         /**
          * Root CSS class of the widget (ex: dijitTextBox), used to construct CSS classes to indicate
@@ -668,7 +668,7 @@ declare namespace dijit {
         /**
          * pointer to original DOM node
          */
-        srcNodeRef: HTMLElement;
+        srcNodeRef?: HTMLElement;
 
         /**
          * This is our visible representation of the widget! Other DOM
@@ -682,7 +682,7 @@ declare namespace dijit {
          * Designates where children of the source DOM node will be placed.
          * "Children" in this case refers to both DOM nodes and widgets.
          */
-        containerNode: HTMLElement;
+        containerNode?: HTMLElement;
 
         /**
          * The document this widget belongs to.  If not specified to constructor, will default to
@@ -701,7 +701,7 @@ declare namespace dijit {
          * The text direction can be different than the GUI direction by using this parameter in creation
          * of a widget.
          */
-        textDir: string;
+        textDir?: string;
 
         _started?: boolean;
 
diff --git a/dojo-typings/src/main/typings/dojo/store.d.ts b/dojo-typings/src/main/typings/dojo/store.d.ts
--- a/dojo-typings/src/main/typings/dojo/store.d.ts
+++ b/dojo-typings/src/main/typings/dojo/store.d.ts
@@ -48,7 +48,7 @@ declare namespace dojo {
 				matches(object: T): boolean;
 			}
 
-			type BaseQueryType = string | object | ((...params: unknown[]) => unknown);
+			type BaseQueryType = string | object | ((...params: unknown[]) => boolean);
 
 			interface QueryEngine<T extends object, Q extends BaseQueryType> {
 				<O extends QueryOptions>(query: Q, options?: O): QueryEngineFunction<T>;
diff --git a/dojo-typings/src/test/ts/_WidgetTests.ts b/dojo-typings/src/test/ts/_WidgetTests.ts
--- a/dojo-typings/src/test/ts/_WidgetTests.ts
+++ b/dojo-typings/src/test/ts/_WidgetTests.ts
@@ -18,7 +18,7 @@ class ScheduleWidget extends _WidgetBase
     data: string[];
 
     _onClick() {
-        this.set("data", "", "");
+        this.set("data", ["", ""]);
 
         const t = this.get("title");
         this.set({
@@ -35,7 +35,7 @@ const w = new ScheduleWidget({title: "Ye
 
 w.get("data");
 
-w.set("data", "a","b");
+w.set("data", ["a","b"]);
 w.set({
     data: ["a", "b"]
 });