7 files changed, 53 insertions, 22 deletions
diff --git a/cli/js/deno.ts b/cli/js/deno.ts
index e2052f729..c563d5112 100644
--- a/cli/js/deno.ts
+++ b/cli/js/deno.ts
@@ -90,7 +90,6 @@ export {
   dir,
   env,
   exit,
-  isTTY,
   execPath,
   hostname,
   loadavg,
@@ -124,6 +123,7 @@ export { statSync, lstatSync, stat, lstat } from "./stat.ts";
 export { symlinkSync, symlink } from "./symlink.ts";
 export { connectTLS, listenTLS } from "./tls.ts";
 export { truncateSync, truncate } from "./truncate.ts";
+export { isatty, setRaw } from "./tty.ts";
 export { utimeSync, utime } from "./utime.ts";
 export { version } from "./version.ts";
 export { writeFileSync, writeFile, WriteFileOptions } from "./write_file.ts";
diff --git a/cli/js/lib.deno.ns.d.ts b/cli/js/lib.deno.ns.d.ts
index b22d89ebe..f94d28407 100644
--- a/cli/js/lib.deno.ns.d.ts
+++ b/cli/js/lib.deno.ns.d.ts
@@ -30,16 +30,6 @@ declare namespace Deno {
 
   export function runTests(opts?: RunTestsOptions): Promise<void>;
 
-  /** Check if running in terminal.
-   *
-   *       console.log(Deno.isTTY().stdout);
-   */
-  export function isTTY(): {
-    stdin: boolean;
-    stdout: boolean;
-    stderr: boolean;
-  };
-
   /** Get the loadavg. Requires the `--allow-env` flag.
    *
    *       console.log(Deno.loadavg());
@@ -492,6 +482,7 @@ declare namespace Deno {
     seekSync(offset: number, whence: SeekMode): void;
     close(): void;
   }
+
   /** An instance of `File` for stdin. */
   export const stdin: File;
   /** An instance of `File` for stdout. */
@@ -555,6 +546,20 @@ declare namespace Deno {
     /** Read-write. Behaves like `x` and allows to read from file. */
     | "x+";
 
+  // @url js/tty.d.ts
+
+  /** UNSTABLE: newly added API
+   *
+   *  Check if a given resource is TTY
+   */
+  export function isatty(rid: number): boolean;
+
+  /** UNSTABLE: newly added API
+   *
+   *  Set TTY to be under raw mode or not.
+   */
+  export function setRaw(rid: number, mode: boolean): void;
+
   // @url js/buffer.d.ts
 
   /** A Buffer is a variable-sized buffer of bytes with read() and write()
diff --git a/cli/js/os.ts b/cli/js/os.ts
index 2a68ff8d3..309f5e1ff 100644
--- a/cli/js/os.ts
+++ b/cli/js/os.ts
@@ -3,13 +3,6 @@ import { sendSync } from "./dispatch_json.ts";
 import { errors } from "./errors.ts";
 import * as util from "./util.ts";
 
-/** Check if running in terminal.
- *
- *       console.log(Deno.isTTY().stdout);
- */
-export function isTTY(): { stdin: boolean; stdout: boolean; stderr: boolean } {
-  return sendSync("op_is_tty");
-}
 /** Get the loadavg.
  * Requires the `--allow-env` flag.
  *
diff --git a/cli/js/os_test.ts b/cli/js/os_test.ts
index 6e771fe98..cdf72fdd7 100644
--- a/cli/js/os_test.ts
+++ b/cli/js/os_test.ts
@@ -115,10 +115,6 @@ test(function osPid(): void {
   assert(Deno.pid > 0);
 });
 
-test(function osIsTTYSmoke(): void {
-  console.log(Deno.isTTY());
-});
-
 testPerm({ env: true }, function getDir(): void {
   type supportOS = "mac" | "win" | "linux";
 
diff --git a/cli/js/tty.ts b/cli/js/tty.ts
new file mode 100644
index 000000000..2ad44d025
--- /dev/null
+++ b/cli/js/tty.ts
@@ -0,0 +1,14 @@
+import { sendSync } from "./dispatch_json.ts";
+
+/** Check if a given resource is TTY. */
+export function isatty(rid: number): boolean {
+  return sendSync("op_isatty", { rid });
+}
+
+/** Set TTY to be under raw mode or not. */
+export function setRaw(rid: number, mode: boolean): void {
+  sendSync("op_set_raw", {
+    rid,
+    mode
+  });
+}
diff --git a/cli/js/tty_test.ts b/cli/js/tty_test.ts
new file mode 100644
index 000000000..f58784a7c
--- /dev/null
+++ b/cli/js/tty_test.ts
@@ -0,0 +1,22 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { test, testPerm, assert } from "./test_util.ts";
+
+// Note tests for Deno.setRaw is in integration tests.
+
+testPerm({ read: true }, function isatty(): void {
+  // CI not under TTY, so cannot test stdin/stdout/stderr.
+  const f = Deno.openSync("cli/tests/hello.txt");
+  assert(!Deno.isatty(f.rid));
+});
+
+test(function isattyError(): void {
+  let caught = false;
+  try {
+    // Absurdly large rid.
+    Deno.isatty(0x7fffffff);
+  } catch (e) {
+    caught = true;
+    assert(e instanceof Deno.errors.BadResource);
+  }
+  assert(caught);
+});
diff --git a/cli/js/unit_tests.ts b/cli/js/unit_tests.ts
index 1c8237466..2495c938b 100644
--- a/cli/js/unit_tests.ts
+++ b/cli/js/unit_tests.ts
@@ -54,6 +54,7 @@ import "./text_encoding_test.ts";
 import "./timers_test.ts";
 import "./tls_test.ts";
 import "./truncate_test.ts";
+import "./tty_test.ts";
 import "./url_test.ts";
 import "./url_search_params_test.ts";
 import "./utime_test.ts";