diff --git a/src/lib/api/documents.js b/src/lib/api/documents.ts
similarity index 89%
rename from src/lib/api/documents.js
rename to src/lib/api/documents.ts
index 1cedabed3..74b127e7c 100644
--- a/src/lib/api/documents.js
+++ b/src/lib/api/documents.ts
@@ -1,20 +1,13 @@
 /** API helpers related to documents.
  * Lots of duplicated code here that should get consolidated at some point.
  */
-import { error } from "@sveltejs/kit";
+import { error, type NumericRange } from "@sveltejs/kit";
 import { APP_URL, BASE_API_URL } from "@/config/config.js";
 import { DEFAULT_EXPAND } from "@/api/common.js";
 import { isOrg } from "@/api/types/orgAndUser";
+import { isErrorCode } from "../utils";
 
-/**
- * Search documents
- *
- * @async
- * @param {query} string
- * @param {boolean} highlight
- * @param {globalThis.fetch} fetch
- * @returns {import('./types').DocumentResults}
- */
+/** Search documents */
 export async function search(
   query = "",
   highlight = false,
@@ -24,11 +17,11 @@ export async function search(
 
   endpoint.searchParams.set("expand", DEFAULT_EXPAND);
   endpoint.searchParams.set("q", query);
-  endpoint.searchParams.set("hl", highlight);
+  endpoint.searchParams.set("hl", String(highlight));
 
   const resp = await fetch(endpoint, { credentials: "include" });
 
-  if (!resp.ok) {
+  if (isErrorCode(resp.status)) {
     error(resp.status, resp.statusText);
   }
 
@@ -38,21 +31,18 @@ export async function search(
 /**
  * Load a single document from the API
  * Example: https://api.www.documentcloud.org/api/documents/1/
- *
- * @async
- * @export
- * @param {number} id
- * @param {globalThis.fetch} fetch
- * @returns {import('./types').Document}
  */
-export async function get(id, fetch) {
+export async function get(
+  id: number,
+  fetch: typeof globalThis.fetch,
+): Promise<Document> {
   const endpoint = new URL(`documents/${id}.json`, BASE_API_URL);
   const expand = ["user", "organization", "projects", "revisions"];
   endpoint.searchParams.set("expand", expand.join(","));
 
   const resp = await fetch(endpoint, { credentials: "include" });
 
-  if (!resp.ok) {
+  if (isErrorCode(resp.status)) {
     error(resp.status, resp.statusText);
   }
 
diff --git a/src/routes/documents/[id]-[slug]/+layout.js b/src/routes/documents/[id]-[slug]/+layout.js
index ee2f4707d..ee4225464 100644
--- a/src/routes/documents/[id]-[slug]/+layout.js
+++ b/src/routes/documents/[id]-[slug]/+layout.js
@@ -5,7 +5,7 @@
  */
 
 import { redirect } from "@sveltejs/kit";
-import * as documents from "$lib/api/documents.js";
+import * as documents from "@/lib/api/documents";
 
 /** @type {import('./$types').PageLoad} */
 export async function load({ fetch, params }) {