[IMP] component,qweb: props validation

We re-add the possibility to validate props when dev mode is active.
No change in the API right Now. The dev mode is activated via the
configure method of App class.

tests/qweb/error_handling.test.ts

@@ -15,7 +15,9 @@ describe("error handling", () => {
   test("cannot add twice the same template", () => {
     const context = new TestContext();
     context.addTemplate("test", `<t></t>`);
-    expect(() => context.addTemplate("test", "<div/>", { allowDuplicate: true })).not.toThrow("already defined");
+    expect(() => context.addTemplate("test", "<div/>", { allowDuplicate: true })).not.toThrow(
+      "already defined"
+    );
     expect(() => context.addTemplate("test", "<div/>")).toThrow("already defined");
   });
 
@@ -37,4 +39,4 @@ describe("error handling", () => {
       "Unknown QWeb directive: 't-best-beer'"
     );
   });
-});
+});

tests/qweb/t_tag.test.ts

@@ -1,7 +1,4 @@
-import {
-  renderToString,
-  snapshotEverything,
-} from "../helpers";
+import { renderToString, snapshotEverything } from "../helpers";
 
 snapshotEverything();
 
@@ -28,4 +25,4 @@ describe("qweb t-tag", () => {
     const expected = `<div taste=\"raspberry\" class=\"blueberry\">gooseberry</div>`;
     expect(renderToString(template, { tag: "div" })).toBe(expected);
   });
-});
+});