seek should return cursor position (#4211)

1 files changed, 11 insertions, 6 deletions

diff --git a/cli/js/lib.deno.ns.d.ts b/cli/js/lib.deno.ns.d.ts
index c54876008..50aab6a35 100644
--- a/cli/js/lib.deno.ns.d.ts
+++ b/cli/js/lib.deno.ns.d.ts
@@ -383,8 +383,9 @@ declare namespace Deno {
      * Seeking to an offset before the start of the file is an error. Seeking to
      * any positive offset is legal, but the behavior of subsequent I/O
      * operations on the underlying object is implementation-dependent.
+     * It returns the number of cursor position.
      */
-    seek(offset: number, whence: SeekMode): Promise<void>;
+    seek(offset: number, whence: SeekMode): Promise<number>;
   }
 
   export interface SyncSeeker {
@@ -397,7 +398,7 @@ declare namespace Deno {
      * any positive offset is legal, but the behavior of subsequent I/O
      * operations on the underlying object is implementation-dependent.
      */
-    seekSync(offset: number, whence: SeekMode): void;
+    seekSync(offset: number, whence: SeekMode): number;
   }
 
   export interface ReadCloser extends Reader, Closer {}
@@ -525,7 +526,11 @@ declare namespace Deno {
    *       const file = Deno.openSync("/foo/bar.txt");
    *       Deno.seekSync(file.rid, 0, 0);
    */
-  export function seekSync(rid: number, offset: number, whence: SeekMode): void;
+  export function seekSync(
+    rid: number,
+    offset: number,
+    whence: SeekMode
+  ): number;
 
   /** Seek a file ID to the given offset under mode given by `whence`.
    *
@@ -536,7 +541,7 @@ declare namespace Deno {
     rid: number,
     offset: number,
     whence: SeekMode
-  ): Promise<void>;
+  ): Promise<number>;
 
   /** Close the given resource ID. */
   export function close(rid: number): void;
@@ -557,8 +562,8 @@ declare namespace Deno {
     writeSync(p: Uint8Array): number;
     read(p: Uint8Array): Promise<number | EOF>;
     readSync(p: Uint8Array): number | EOF;
-    seek(offset: number, whence: SeekMode): Promise<void>;
-    seekSync(offset: number, whence: SeekMode): void;
+    seek(offset: number, whence: SeekMode): Promise<number>;
+    seekSync(offset: number, whence: SeekMode): number;
     close(): void;
   }