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, 27 insertions, 0 deletions

diff --git a/ext/node/polyfills/tty.js b/ext/node/polyfills/tty.js
index 3a84a1f94..2e8ecc8e1 100644
--- a/ext/node/polyfills/tty.js
+++ b/ext/node/polyfills/tty.js
@@ -1,5 +1,6 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
 
+import { op_bootstrap_color_depth } from "ext:core/ops";
 import { core, primordials } from "ext:core/mod.js";
 const {
   Error,
@@ -105,6 +106,32 @@ export class WriteStream extends Socket {
     this.rows = rows;
     this.isTTY = true;
   }
+
+  /**
+   * @param {number | Record<string, string>} [count]
+   * @param {Record<string, string>} [env]
+   * @returns {boolean}
+   */
+  hasColors(count, env) {
+    if (env === undefined && typeof count === "object") {
+      env = count;
+      count = 16;
+    }
+
+    const depth = this.getColorDepth(env);
+    return count <= 2 ** depth;
+  }
+
+  /**
+   * @param {Record<string, string} [env]
+   * @returns {1 | 4 | 8 | 24}
+   */
+  getColorDepth(_env) {
+    // TODO(@marvinhagemeister): Ignore env parameter.
+    // Haven't seen it used anywhere, seems more done
+    // to make testing easier in Node
+    return op_bootstrap_color_depth();
+  }
 }
 
 export { isatty };