tty: add hasColors function

This adds a small wrapper around the `getColorDepth` function to check
if the stream supports at least a specific amount of colors. This is
convenient as the other API is not as straight forward and most use
cases likely only want to know if a specific amount of colors is
supported or not.

PR-URL: https://github.com/nodejs/node/pull/26247
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/tty.js b/lib/tty.js
index 6efaac6e43..bc568146fd 100644
--- a/lib/tty.js
+++ b/lib/tty.js
@@ -26,7 +26,10 @@ const net = require('net');
 const { TTY, isTTY } = internalBinding('tty_wrap');
 const errors = require('internal/errors');
 const { ERR_INVALID_FD, ERR_TTY_INIT_FAILED } = errors.codes;
-const { getColorDepth } = require('internal/tty');
+const {
+  getColorDepth,
+  hasColors
+} = require('internal/tty');
 
 // Lazy loaded for startup performance.
 let readline;
@@ -109,6 +112,8 @@ WriteStream.prototype.isTTY = true;
 
 WriteStream.prototype.getColorDepth = getColorDepth;
 
+WriteStream.prototype.hasColors = hasColors;
+
 WriteStream.prototype._refreshSize = function() {
   const oldCols = this.columns;
   const oldRows = this.rows;