fix(node): support `tty.hasColors()` and `tty.getColorDepth()` (#24619)

This PR adds support for
[`tty.WriteStream.prototype.hasColors()`](https://nodejs.org/api/tty.html#writestreamhascolorscount-env)
and
[`tty.WriteStream.prototype.getColorDepth()`](https://nodejs.org/api/tty.html#writestreamgetcolordepthenv).

I couldn't find any usage on GitHub which passes parameters to it.
Therefore I've skipped adding support for the `env` parameter to keep
our snapshot size small.

Based on https://github.com/denoland/deno_terminal/pull/3

Fixes https://github.com/denoland/deno/issues/24616

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/unit_node/tty_test.ts b/tests/unit_node/tty_test.ts
index 39ab4fe17..cde05b9ff 100644
--- a/tests/unit_node/tty_test.ts
+++ b/tests/unit_node/tty_test.ts
@@ -3,6 +3,7 @@
 
 import { assert } from "@std/assert/mod.ts";
 import { isatty } from "node:tty";
+import tty from "node:tty";
 import process from "node:process";
 
 Deno.test("[node/tty isatty] returns true when fd is a tty, false otherwise", () => {
@@ -34,3 +35,11 @@ Deno.test("[node/tty WriteStream.isTTY] returns true when fd is a tty", () => {
   assert(Deno.stdin.isTerminal() === process.stdin.isTTY);
   assert(Deno.stdout.isTerminal() === process.stdout.isTTY);
 });
+
+Deno.test("[node/tty WriteStream.hasColors] returns true when colors are supported", () => {
+  assert(tty.WriteStream.prototype.hasColors() === !Deno.noColor);
+});
+
+Deno.test("[node/tty WriteStream.getColorDepth] returns current terminal color depth", () => {
+  assert([1, 4, 8, 24].includes(tty.WriteStream.prototype.getColorDepth()));
+});