[IMP] qweb: log invalid code generated by template

src/qweb_core.ts

@@ -296,11 +296,14 @@ export class QWeb {
         ctx.code.join("\n")
       ) as CompiledTemplate;
     } catch (e) {
+      const templateName = ctx.templateName.replace(/`/g, "'");
+      console.groupCollapsed(`Invalid Code generated by ${templateName}`);
+      console.warn(ctx.code.join("\n"));
+      console.groupEnd();
       throw new Error(
-        `Invalid generated code while compiling template '${ctx.templateName.replace(
-          /`/g,
-          "'"
-        )}': ${e.message}`
+        `Invalid generated code while compiling template '${templateName}': ${
+          e.message
+        }`
       );
     }
     if (isDebug) {

tests/qweb.test.ts

@@ -85,6 +85,10 @@ describe("error handling", () => {
   });
 
   test("error when compiled code is invalid", () => {
+    const consoleWarn = console.warn;
+    const consoleGroupCollapsed = console.groupCollapsed;
+    console.warn = jest.fn();
+    console.groupCollapsed = jest.fn();
     qweb.addTemplate(
       "templatename",
       `<div t-att-hey="}/^function invalid{{>'"></div>`
@@ -92,6 +96,9 @@ describe("error handling", () => {
     expect(() => qweb.render("templatename")).toThrow(
       "Invalid generated code while compiling template 'templatename': Unexpected token }"
     );
+    expect(console.warn).toBeCalledTimes(1);
+    console.warn = consoleWarn;
+    console.groupCollapsed = consoleGroupCollapsed;
   });
 
   test("error when unknown directive", () => {