1 files changed, 11 insertions, 3 deletions
diff --git a/cli/js/ops/fs/open.ts b/cli/js/ops/fs/open.ts
index 4c9281909..2ac5c715c 100644
--- a/cli/js/ops/fs/open.ts
+++ b/cli/js/ops/fs/open.ts
@@ -8,26 +8,34 @@ export interface OpenOptions {
   truncate?: boolean;
   create?: boolean;
   createNew?: boolean;
+  /** Permissions to use if creating the file (defaults to `0o666`, before
+   * the process's umask).
+   * It's an error to specify mode without also setting create or createNew to `true`.
+   * Ignored on Windows. */
+  mode?: number;
 }
 
 export type OpenMode = "r" | "r+" | "w" | "w+" | "a" | "a+" | "x" | "x+";
 
 export function openSync(
   path: string,
-  mode: OpenMode | undefined,
+  openMode: OpenMode | undefined,
   options: OpenOptions | undefined
 ): number {
-  return sendSync("op_open", { path, options, mode });
+  const mode: number | undefined = options?.mode;
+  return sendSync("op_open", { path, options, openMode, mode });
 }
 
 export async function open(
   path: string,
-  mode: OpenMode | undefined,
+  openMode: OpenMode | undefined,
   options: OpenOptions | undefined
 ): Promise<number> {
+  const mode: number | undefined = options?.mode;
   return sendAsync("op_open", {
     path,
     options,
+    openMode,
     mode
   });
 }