change type of stdio handles in JS api (#4891)

cli/js/files.ts

@@ -97,9 +97,66 @@ export class File
   }
 }
 
-export const stdin = new File(0);
+class Stdin implements Reader, SyncReader, Closer {
-export const stdout = new File(1);
+  readonly rid: number;
-export const stderr = new File(2);
+  constructor() {
+    this.rid = 0;
+  }
+
+  read(p: Uint8Array): Promise<number | EOF> {
+    return read(this.rid, p);
+  }
+
+  readSync(p: Uint8Array): number | EOF {
+    return readSync(this.rid, p);
+  }
+
+  close(): void {
+    close(this.rid);
+  }
+}
+
+class Stdout implements Writer, SyncWriter, Closer {
+  readonly rid: number;
+  constructor() {
+    this.rid = 1;
+  }
+
+  write(p: Uint8Array): Promise<number> {
+    return write(this.rid, p);
+  }
+
+  writeSync(p: Uint8Array): number {
+    return writeSync(this.rid, p);
+  }
+
+  close(): void {
+    close(this.rid);
+  }
+}
+
+export class Stderr implements Writer, SyncWriter, Closer {
+  readonly rid: number;
+  constructor() {
+    this.rid = 2;
+  }
+
+  write(p: Uint8Array): Promise<number> {
+    return write(this.rid, p);
+  }
+
+  writeSync(p: Uint8Array): number {
+    return writeSync(this.rid, p);
+  }
+
+  close(): void {
+    close(this.rid);
+  }
+}
+
+export const stdin = new Stdin();
+export const stdout = new Stdout();
+export const stderr = new Stderr();
 
 function checkOpenOptions(options: OpenOptions): void {
   if (Object.values(options).filter((val) => val === true).length === 0) {

cli/js/lib.deno.ns.d.ts

@@ -825,12 +825,24 @@ declare namespace Deno {
     close(): void;
   }
 
-  /** An instance of `Deno.File` for `stdin`. */
+  export interface Stdin extends Reader, SyncReader, Closer {
-  export const stdin: File;
+    readonly rid: number;
-  /** An instance of `Deno.File` for `stdout`. */
+  }
-  export const stdout: File;
+
-  /** An instance of `Deno.File` for `stderr`. */
+  export interface Stdout extends Writer, SyncWriter, Closer {
-  export const stderr: File;
+    readonly rid: number;
+  }
+
+  export interface Stderr extends Writer, SyncWriter, Closer {
+    readonly rid: number;
+  }
+
+  /** A handle for `stdin`. */
+  export const stdin: Stdin;
+  /** A handle for `stdout`. */
+  export const stdout: Stdout;
+  /** A handle for `stderr`. */
+  export const stderr: Stderr;
 
   export interface OpenOptions {
     /** Sets the option for read access. This option, when `true`, means that the

cli/js/web/console.ts

@@ -1,7 +1,8 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import { isTypedArray, TypedArray } from "./util.ts";
 import { TextEncoder } from "./text_encoding.ts";
-import { File, stdout } from "../files.ts";
+import { SyncWriter } from "../io.ts";
+import { stdout } from "../files.ts";
 import { cliTable } from "./console_table.ts";
 import { exposeForTest } from "../internals.ts";
 import { PromiseState } from "./promise.ts";
@@ -38,12 +39,12 @@ export class CSI {
 
 /* eslint-disable @typescript-eslint/no-use-before-define */
 
-function cursorTo(stream: File, _x: number, _y?: number): void {
+function cursorTo(stream: SyncWriter, _x: number, _y?: number): void {
   const uint8 = new TextEncoder().encode(CSI.kClear);
   stream.writeSync(uint8);
 }
 
-function clearScreenDown(stream: File): void {
+function clearScreenDown(stream: SyncWriter): void {
   const uint8 = new TextEncoder().encode(CSI.kClearScreenDown);
   stream.writeSync(uint8);
 }