chore(tty): soft-remove Deno.isatty() (#25410)

Towards #22079

cli/tsc/dts/lib.deno.ns.d.ts

@@ -2875,25 +2875,6 @@ declare namespace Deno {
     signal?: AbortSignal;
   }
 
-  /**
-   *  Check if a given resource id (`rid`) is a TTY (a terminal).
-   *
-   * ```ts
-   * // This example is system and context specific
-   * const nonTTYRid = Deno.openSync("my_file.txt").rid;
-   * const ttyRid = Deno.openSync("/dev/tty6").rid;
-   * console.log(Deno.isatty(nonTTYRid)); // false
-   * console.log(Deno.isatty(ttyRid)); // true
-   * ```
-   *
-   * @deprecated This will be soft-removed in Deno 2.0. See the
-   * {@link https://docs.deno.com/runtime/manual/advanced/migrate_deprecations | Deno 1.x to 2.x Migration Guide}
-   * for migration instructions.
-   *
-   * @category I/O
-   */
-  export function isatty(rid: number): boolean;
-
   /**
    * A variable-sized buffer of bytes with `read()` and `write()` methods.
    *

runtime/js/40_tty.js

@@ -1,5 +1,5 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
-import { core, internals, primordials } from "ext:core/mod.js";
+import { core, primordials } from "ext:core/mod.js";
 import { op_console_size } from "ext:core/ops";
 const {
   Uint32Array,
@@ -15,12 +15,9 @@ function consoleSize() {
   return { columns: size[0], rows: size[1] };
 }
 
+// Note: This function was soft-removed in Deno 2. Its types have been removed,
+// but its implementation has been kept to avoid breaking changes.
 function isatty(rid) {
-  internals.warnOnDeprecatedApi(
-    "Deno.isatty()",
-    new Error().stack,
-    "Use `Deno.stdin.isTerminal()`, `Deno.stdout.isTerminal()`, `Deno.stderr.isTerminal()` or `Deno.FsFile.isTerminal()` instead.",
-  );
   return isTerminal(rid);
 }
 

tests/unit/tty_test.ts

@@ -20,6 +20,7 @@ Deno.test(
   function isatty() {
     // CI not under TTY, so cannot test stdin/stdout/stderr.
     const f = Deno.openSync("tests/testdata/assets/hello.txt");
+    // @ts-ignore `Deno.isatty()` was soft-removed in Deno 2.
     assert(!Deno.isatty(f.rid));
     f.close();
   },
@@ -29,6 +30,7 @@ Deno.test(function isattyError() {
   let caught = false;
   try {
     // Absurdly large rid.
+    // @ts-ignore `Deno.isatty()` was soft-removed in Deno 2.
     Deno.isatty(0x7fffffff);
   } catch (e) {
     caught = true;