feat(cli): add copy argument to Buffer.bytes (#6697)

2 files changed, 7 insertions, 4 deletions

diff --git a/cli/js/buffer.ts b/cli/js/buffer.ts
index 3308a9a0c..4f88ff625 100644
--- a/cli/js/buffer.ts
+++ b/cli/js/buffer.ts
@@ -39,7 +39,8 @@ export class Buffer implements Reader, ReaderSync, Writer, WriterSync {
     this.#buf = new Uint8Array(ab);
   }
 
-  bytes(): Uint8Array {
+  bytes(options: { copy?: boolean } = { copy: true }): Uint8Array {
+    if (options.copy === false) return this.#buf.subarray(this.#off);
     return this.#buf.slice(this.#off);
   }
 
diff --git a/cli/js/lib.deno.ns.d.ts b/cli/js/lib.deno.ns.d.ts
index 32b9bb39b..373f3be2f 100644
--- a/cli/js/lib.deno.ns.d.ts
+++ b/cli/js/lib.deno.ns.d.ts
@@ -820,10 +820,12 @@ declare namespace Deno {
      *
      * The slice is valid for use only until the next buffer modification (that
      * is, only until the next call to a method like `read()`, `write()`,
-     * `reset()`, or `truncate()`). The slice aliases the buffer content at
+     * `reset()`, or `truncate()`). If `options.copy` is false the slice aliases the buffer content at
      * least until the next buffer modification, so immediate changes to the
-     * slice will affect the result of future reads. */
-    bytes(): Uint8Array;
+     * slice will affect the result of future reads.
+     * @param options Defaults to `{ copy: true }`
+     */
+    bytes(options?: { copy?: boolean }): Uint8Array;
     /** Returns whether the unread portion of the buffer is empty. */
     empty(): boolean;
     /** A read only number of bytes of the unread portion of the buffer. */