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-rw-r--r--io/writers_test.ts2
1 files changed, 1 insertions, 1 deletions
diff --git a/io/writers_test.ts b/io/writers_test.ts
index 5d6ed33ef..decf611f1 100644
--- a/io/writers_test.ts
+++ b/io/writers_test.ts
@@ -5,7 +5,7 @@ import { StringWriter } from "./writers.ts";
import { StringReader } from "./readers.ts";
import { copyN } from "./ioutil.ts";
-test(async function ioStringWriter() {
+test(async function ioStringWriter(): Promise<void> {
const w = new StringWriter("base");
const r = new StringReader("0123456789");
await copyN(w, r, 4);