diff --git a/src/compiler/compile/render_ssr/handlers/shared/get_attribute_value.ts b/src/compiler/compile/render_ssr/handlers/shared/get_attribute_value.ts
index 6c3aad7456..c6a1b7087a 100644
--- a/src/compiler/compile/render_ssr/handlers/shared/get_attribute_value.ts
+++ b/src/compiler/compile/render_ssr/handlers/shared/get_attribute_value.ts
@@ -1,43 +1,52 @@
-import Attribute from '../../../nodes/Attribute';
-import { string_literal } from '../../../utils/stringify';
-import Text from '../../../nodes/Text';
+import { string_literal } from '../../../utils/stringify.js';
 import { x } from 'code-red';
-import Expression from '../../../nodes/shared/Expression';
-import { Expression as ESTreeExpression } from 'estree';
-import { regex_double_quotes } from '../../../../utils/patterns';
+import { regex_double_quotes } from '../../../../utils/patterns.js';
 
-export function get_class_attribute_value(attribute: Attribute): ESTreeExpression {
-	// handle special case — `class={possiblyUndefined}` with scoped CSS
-	if (attribute.chunks.length === 2 && (attribute.chunks[1] as Text).synthetic) {
-		const value = (attribute.chunks[0] as Expression).node;
-		return x`@escape(@null_to_empty(${value}), true) + "${(attribute.chunks[1] as Text).data}"`;
-	}
+/**
+ * @param {import('../../../nodes/Attribute.js').default} attribute
+ * @returns {import("C:/repos/svelte/svelte/node_modules/.pnpm/@types+estree@1.0.0/node_modules/@types/estree/index").Expression}
+ */
+export function get_class_attribute_value(attribute) {
+    // handle special case — `class={possiblyUndefined}` with scoped CSS
+    if (attribute.chunks.length === 2 && ( /** @type {import('../../../nodes/Text.js').default} */(attribute.chunks[1])).synthetic) {
+        const value = ( /** @type {import('../../../nodes/shared/Expression.js').default} */(attribute.chunks[0])).node;
+        return x `@escape(@null_to_empty(${value}), true) + "${( /** @type {import('../../../nodes/Text.js').default} */(attribute.chunks[1])).data}"`;
+    }
+    return get_attribute_value(attribute);
+}
 
-	return get_attribute_value(attribute);
+/**
+ * @param {import('../../../nodes/Attribute.js').default} attribute
+ * @returns {import("C:/repos/svelte/svelte/node_modules/.pnpm/@types+estree@1.0.0/node_modules/@types/estree/index").Expression}
+ */
+export function get_attribute_value(attribute) {
+    if (attribute.chunks.length === 0)
+        return x `""`;
+    /**
+     * For value attribute of textarea, it will render as child node of `<textarea>` element.
+     * Therefore, we need to escape as content (not attribute).
+     */
+    const is_textarea_value = attribute.parent.name.toLowerCase() === 'textarea' && attribute.name.toLowerCase() === 'value';
+    return attribute.chunks
+        .map((chunk) => {
+        return chunk.type === 'Text'
+            ? ( /** @type {ESTreeExpression} */(string_literal(chunk.data.replace(regex_double_quotes, '&quot;'))))
+            : x `@escape(${chunk.node}, ${is_textarea_value ? 'false' : 'true'})`;
+    })
+        .reduce((lhs, rhs) => x `${lhs} + ${rhs}`);
+}
+
+/**
+ * @param {import('../../../nodes/Attribute.js').default} attribute
+ * @returns {import("C:/repos/svelte/svelte/node_modules/.pnpm/@types+estree@1.0.0/node_modules/@types/estree/index").Expression}
+ */
+export function get_attribute_expression(attribute) {
+    if (attribute.chunks.length === 1 && attribute.chunks[0].type === 'Expression') {
+        return /** @type {ESTreeExpression} */ (( /** @type {import('../../../nodes/shared/Expression.js').default} */(attribute.chunks[0])).node);
+    }
+    return get_attribute_value(attribute);
 }
 
-export function get_attribute_value(attribute: Attribute): ESTreeExpression {
-	if (attribute.chunks.length === 0) return x`""`;
 
-	/**
-	 * For value attribute of textarea, it will render as child node of `<textarea>` element.
-	 * Therefore, we need to escape as content (not attribute).
-	 */
-	const is_textarea_value =
-		attribute.parent.name.toLowerCase() === 'textarea' && attribute.name.toLowerCase() === 'value';
 
-	return attribute.chunks
-		.map((chunk) => {
-			return chunk.type === 'Text'
-				? (string_literal(chunk.data.replace(regex_double_quotes, '&quot;')) as ESTreeExpression)
-				: x`@escape(${chunk.node}, ${is_textarea_value ? 'false' : 'true'})`;
-		})
-		.reduce((lhs, rhs) => x`${lhs} + ${rhs}`);
-}
 
-export function get_attribute_expression(attribute: Attribute): ESTreeExpression {
-	if (attribute.chunks.length === 1 && attribute.chunks[0].type === 'Expression') {
-		return (attribute.chunks[0] as Expression).node as ESTreeExpression;
-	}
-	return get_attribute_value(attribute);
-}
diff --git a/src/compiler/compile/render_ssr/handlers/utils/remove_whitespace_children.js b/src/compiler/compile/render_ssr/handlers/utils/remove_whitespace_children.js
index 2c67251a19..c107db5226 100644
--- a/src/compiler/compile/render_ssr/handlers/utils/remove_whitespace_children.js
+++ b/src/compiler/compile/render_ssr/handlers/utils/remove_whitespace_children.js
@@ -1,17 +1,18 @@
 import { trim_end, trim_start } from '../../../../utils/trim.js';
-import { link } from '../../../../utils/link';
-import { regex_starts_with_whitespace } from '../../../../utils/patterns';
+import { link } from '../../../../utils/link.js';
+import { regex_starts_with_whitespace } from '../../../../utils/patterns.js';
+
 // similar logic from `compile/render_dom/wrappers/Fragment`
 // We want to remove trailing whitespace inside an element/component/block,
 // *unless* there is no whitespace between this node and its next sibling
 
 /**
- * @param {INode[]} children
+ * @param {import('../../../nodes/interfaces.js').INode[]} children
  * @param {import('../../../nodes/interfaces.js').INode} [next]
- * @returns {INode[]}
+ * @returns {import('../../../nodes/interfaces.js').INode[]}
  */
 export default function remove_whitespace_children(children, next) {
-	/** @type {INode[]} */
+	/** @type {import('../../../nodes/interfaces.js').INode[]} */
 	const nodes = [];
 
 	/** @type {import('../../../nodes/interfaces.js').INode} */