Fix StreamOps.{read,readAsync,write} type definitions.

Author: miyukoc

src/app.tsx

@@ -382,12 +382,12 @@ declare global {
             return readBytes.length;
         },
 
-        write: (_stream, buffer, offset, length) => {
+        write: (_stream, signedBuffer, offset, length) => {
             // Note: default `buffer` is for some reason `HEAP8` (signed), while we want unsigned `HEAPU8`.
-            buffer = new Uint8Array(
-                buffer.buffer,
-                buffer.byteOffset,
-                buffer.byteLength,
+            let buffer = new Uint8Array(
+                signedBuffer.buffer,
+                signedBuffer.byteOffset,
+                signedBuffer.byteLength,
             );
             xterm.write(buffer.subarray(offset, offset + length));
             return length;

src/vendor/pyodide.ts

@@ -63,9 +63,9 @@ declare namespace FS {
     interface StreamOps {
         open?: (stream: FSStream) => void;
         close?: (stream: FSStream) => void;
-        read?: (stream: FSStream, buffer: Uint8Array, offset: number, length: number, position: number) => number;
-        readAsync?: (stream: FSStream, buffer: Uint8Array, offset: number, length: number, position: number) => Promise<number>;
-        write?: (stream: FSStream, buffer: Uint8Array, offset: number, length: number, position: number) => number;
+        read?: (stream: FSStream, buffer: Int8Array, offset: number, length: number, position: number) => number;
+        readAsync?: (stream: FSStream, buffer: Int8Array, offset: number, length: number, position: number) => Promise<number>;
+        write?: (stream: FSStream, buffer: Int8Array, offset: number, length: number, position: number) => number;
         llseek?: (stream: FSStream, offset: number, whence: number) => number;
         pollAsync?: (stream: FSStream, timeout: number) => Promise<number>;
         ioctl?: (stream: FSStream, request: number, varargs: number) => number;