1 files changed, 10 insertions, 0 deletions
diff --git a/core/lib.deno_core.d.ts b/core/lib.deno_core.d.ts
index b238bd6b3..7f3ea2a19 100644
--- a/core/lib.deno_core.d.ts
+++ b/core/lib.deno_core.d.ts
@@ -61,6 +61,16 @@ declare namespace Deno {
     function writeAll(rid: number, buf: Uint8Array): Promise<void>;
 
     /**
+     * Synchronously read from a (stream) resource that implements readSync().
+     */
+    function readSync(rid: number, buf: Uint8Array): number;
+
+    /**
+     * Synchronously write to a (stream) resource that implements writeSync().
+     */
+    function writeSync(rid: number, buf: Uint8Array): number;
+
+    /**
      * Print a message to stdout or stderr
      */
     function print(message: string, is_err?: boolean): void;