diff --git a/line.d.ts b/line.ts
similarity index 100%
rename from line.d.ts
rename to line.ts
diff --git a/scrapbox.d.ts b/scrapbox.ts
similarity index 99%
rename from scrapbox.d.ts
rename to scrapbox.ts
index 1aa6fd9..cdcab3e 100644
--- a/scrapbox.d.ts
+++ b/scrapbox.ts
@@ -1,5 +1,5 @@
-import type { ParsedLine } from "./line.d.ts";
-export * from "./line.d.ts";
+import type { ParsedLine } from "./line.ts";
+export * from "./line.ts";
 
 // utilities
 type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;