simplify handling of noop $capture_state/$inject_state

src/compiler/compile/render_dom/index.ts

@@ -169,9 +169,9 @@ export default function dom(
 
 		const capturable_vars = component.vars.filter(v => !v.internal && !v.name.startsWith('$$'));
 
-		capture_state = capturable_vars.length > 0
-			? x`() => ({ ${capturable_vars.map(prop => p`${prop.name}`)} })`
-			: x`@noop`;
+		if (capturable_vars.length > 0) {
+			capture_state = x`() => ({ ${capturable_vars.map(prop => p`${prop.name}`)} })`;
+		}
 
 		const injectable_vars = capturable_vars.filter(v => !v.module && v.writable && v.name[0] !== '$');
 
@@ -190,8 +190,6 @@ export default function dom(
 					$$self.$inject_state($$props.$$inject);
 				}
 			`;
-		} else {
-			inject_state = x`@noop`;
 		}
 	}
 

src/runtime/internal/dev.ts

@@ -120,6 +120,10 @@ export class SvelteComponentDev extends SvelteComponent {
 			console.warn(`Component was already destroyed`); // eslint-disable-line no-console
 		};
 	}
+
+	$capture_state() {}
+
+	$inject_state() {}
 }
 
 export function loop_guard(timeout) {

test/js/samples/debug-no-dependencies/expected.js

@@ -134,16 +134,10 @@ function create_fragment(ctx) {
 	return block;
 }
 
-function instance($$self, $$props, $$invalidate) {
-	$$self.$capture_state = noop;
-	$$self.$inject_state = noop;
-	return [];
-}
-
 class Component extends SvelteComponentDev {
 	constructor(options) {
 		super(options);
-		init(this, options, instance, create_fragment, safe_not_equal, {});
+		init(this, options, null, create_fragment, safe_not_equal, {});
 
 		dispatch_dev("SvelteRegisterComponent", {
 			component: this,