From 18d7e81a9892e718c3cd07b2366a60f2e09561ab Mon Sep 17 00:00:00 2001
From: Simon H <5968653+dummdidumm@users.noreply.github.com>
Date: Wed, 8 Mar 2023 17:06:28 +0100
Subject: [PATCH] chore: replace deprecated property access in preparation for
 TS 5.0 (#9361)

---
 .changeset/stupid-goats-retire.md             |  5 +++++
 .../kit/src/core/sync/write_types/index.js    |  5 ++++-
 packages/migrate/migrations/routes/utils.js   |  4 ++--
 .../src/lib/docs/server/index.js              | 20 +++++++++++--------
 4 files changed, 23 insertions(+), 11 deletions(-)
 create mode 100644 .changeset/stupid-goats-retire.md

diff --git a/.changeset/stupid-goats-retire.md b/.changeset/stupid-goats-retire.md
new file mode 100644
index 000000000000..ff2c10d05d3f
--- /dev/null
+++ b/.changeset/stupid-goats-retire.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+chore: replace deprecated property access in preparation for TS 5.0
diff --git a/packages/kit/src/core/sync/write_types/index.js b/packages/kit/src/core/sync/write_types/index.js
index d4fd032dc6c9..0ae180492f12 100644
--- a/packages/kit/src/core/sync/write_types/index.js
+++ b/packages/kit/src/core/sync/write_types/index.js
@@ -592,7 +592,10 @@ export function tweak_types(content, is_server) {
 				});
 			}
 
-			if (node.modifiers?.some((modifier) => modifier.kind === ts.SyntaxKind.ExportKeyword)) {
+			if (
+				ts.canHaveModifiers(node) &&
+				ts.getModifiers(node)?.some((modifier) => modifier.kind === ts.SyntaxKind.ExportKeyword)
+			) {
 				if (ts.isFunctionDeclaration(node) && node.name?.text && names.has(node.name?.text)) {
 					exports.set(node.name.text, node.name.text);
 				}
diff --git a/packages/migrate/migrations/routes/utils.js b/packages/migrate/migrations/routes/utils.js
index 28ca024be929..bca8fa894817 100644
--- a/packages/migrate/migrations/routes/utils.js
+++ b/packages/migrate/migrations/routes/utils.js
@@ -176,13 +176,13 @@ export function get_exports(node) {
 		} else if (
 			ts.isFunctionDeclaration(statement) &&
 			statement.name &&
-			statement.modifiers?.[0]?.kind === ts.SyntaxKind.ExportKeyword
+			ts.getModifiers(statement)?.[0]?.kind === ts.SyntaxKind.ExportKeyword
 		) {
 			// export function x ...
 			map.set(statement.name.text, statement.name.text);
 		} else if (
 			ts.isVariableStatement(statement) &&
-			statement.modifiers?.[0]?.kind === ts.SyntaxKind.ExportKeyword
+			ts.getModifiers(statement)?.[0]?.kind === ts.SyntaxKind.ExportKeyword
 		) {
 			// export const x = ..., y = ...
 			for (const declaration of statement.declarationList.declarations) {
diff --git a/sites/kit.svelte.dev/src/lib/docs/server/index.js b/sites/kit.svelte.dev/src/lib/docs/server/index.js
index 7723215573ef..20b4dff568f3 100644
--- a/sites/kit.svelte.dev/src/lib/docs/server/index.js
+++ b/sites/kit.svelte.dev/src/lib/docs/server/index.js
@@ -484,14 +484,18 @@ function convert_to_ts(js_code, indent = '', offset = '') {
 						const [name, generics] = get_type_info(tag);
 
 						if (ts.isFunctionDeclaration(node)) {
-							const is_export = node.modifiers?.some(
-								(modifier) => modifier.kind === ts.SyntaxKind.ExportKeyword
-							)
-								? 'export '
-								: '';
-							const is_async = node.modifiers?.some(
-								(modifier) => modifier.kind === ts.SyntaxKind.AsyncKeyword
-							);
+							const is_export =
+								ts.canHaveModifiers(node) &&
+								ts
+									.getModifiers(node)
+									?.some((modifier) => modifier.kind === ts.SyntaxKind.ExportKeyword)
+									? 'export '
+									: '';
+							const is_async =
+								ts.canHaveModifiers(node) &&
+								ts
+									.getModifiers(node)
+									?.some((modifier) => modifier.kind === ts.SyntaxKind.AsyncKeyword);
 							code.overwrite(
 								node.getStart(),
 								node.name.getEnd(),