[IMP] app: allow to instantiate templates lazily

src/runtime/template_set.ts

@@ -41,7 +41,7 @@ export interface TemplateSetConfig {
   dev?: boolean;
   translatableAttributes?: string[];
   translateFn?: (s: string) => string;
-  templates?: string | Document;
+  templates?: string | Document | Record<string, string>;
 }
 
 export class TemplateSet {
@@ -60,7 +60,13 @@ export class TemplateSet {
     this.translateFn = config.translateFn;
     this.translatableAttributes = config.translatableAttributes;
     if (config.templates) {
-      this.addTemplates(config.templates);
+      if (config.templates instanceof Document || typeof config.templates === "string") {
+        this.addTemplates(config.templates);
+      } else {
+        for (const name in config.templates) {
+          this.addTemplate(name, config.templates[name]);
+        }
+      }
     }
   }
 

tests/app/__snapshots__/app.test.ts.snap

@@ -57,6 +57,19 @@ exports[`app can configure an app with props 1`] = `
 }"
 `;
 
+exports[`app can load templates from an object name-string 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+
+  let block1 = createBlock(\`<div class=\\"hello\\">hello</div>\`);
+
+  return function template(ctx, node, key = \\"\\") {
+    return block1();
+  }
+}"
+`;
+
 exports[`app can mount app in an iframe 1`] = `
 "function anonymous(app, bdom, helpers
 ) {

tests/app/app.test.ts

@@ -167,4 +167,21 @@ describe("app", () => {
       ]
     `);
   });
+
+  test("can load templates from an object name-string", async () => {
+    const templates = {
+      hello: `<div class="hello">hello</div>`,
+      world: `<div>world</div>`,
+    };
+    class SomeComponent extends Component {
+      static template = "hello";
+    }
+
+    const app = new App(SomeComponent, { templates });
+    await app.mount(fixture);
+    expect(fixture.querySelector(".hello")).toBeDefined();
+    // Only the "hello" template is used, so the "world" template is not yet loaded
+    expect(Object.keys(app.templates)).toEqual(["hello"]);
+    expect(Object.keys(app.rawTemplates)).toEqual(["hello", "world"]);
+  });
 });