getColorDepth (utils/terminalUtils.ts)

Utility to determine terminal color depth and iTerm2 detection.

// Source: https://github.com/google-gemini/gemini-cli | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
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/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import process from 'node:process';

/**
 * Returns the color depth of the current terminal.
 * Returns 24 (TrueColor) if unknown or not a TTY.
 */
export function getColorDepth(): number {
  return process.stdout.getColorDepth ? process.stdout.getColorDepth() : 24;
}

/**
 * Returns true if the terminal has low color depth (less than 24-bit).
 */
export function isLowColorDepth(): boolean {
  return getColorDepth() < 24;
}

let cachedIsITerm2: boolean | undefined;

/**
 * Returns true if the

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