dry out

Author: Rich-Harris

packages/svelte/src/compiler/phases/3-transform/client/visitors/RenderTag.js

@@ -36,9 +36,7 @@ export function RenderTag(node, context) {
 	memoizer.apply();
 
 	/** @type {Statement[]} */
-	const statements = memoizer.sync.map((memo) =>
-		b.let(memo.id, create_derived(context.state, b.thunk(memo.expression)))
-	);
+	const statements = memoizer.deriveds(context.state.analysis.runes);
 
 	let snippet_function = build_expression(
 		context,

packages/svelte/src/compiler/phases/3-transform/client/visitors/SlotElement.js

@@ -60,9 +60,7 @@ export function SlotElement(node, context) {
 	context.state.init.push(...lets);
 
 	/** @type {Statement[]} */
-	const statements = memoizer.sync.map((memo) =>
-		b.let(memo.id, create_derived(context.state, b.thunk(memo.expression)))
-	);
+	const statements = memoizer.deriveds(context.state.analysis.runes);
 
 	const props_expression =
 		spreads.length === 0 ? b.object(props) : b.call('$.spread_props', b.object(props), ...spreads);

packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/component.js

@@ -447,12 +447,7 @@ export function build_component(node, component_name, context) {
 		};
 	}
 
-	const statements = [
-		...snippet_declarations,
-		...memoizer.sync.map((memo) =>
-			b.let(memo.id, create_derived(context.state, b.thunk(memo.expression)))
-		)
-	];
+	const statements = [...snippet_declarations, ...memoizer.deriveds(context.state.analysis.runes)];
 
 	if (is_component_dynamic) {
 		const prev = fn;

packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/utils.js

@@ -39,6 +39,12 @@ export class Memoizer {
 		return all;
 	}
 
+	deriveds(runes = true) {
+		return this.sync.map((memo) =>
+			b.let(memo.id, b.call(runes ? '$.derived' : '$.derived_safe_equal', b.thunk(memo.expression)))
+		);
+	}
+
 	async_ids() {
 		return this.async.map((memo) => memo.id);
 	}