@dderevjanik/termux-api/src/scripts/termux-volume.ts

This library allows you to interact with your Android device from Node.js using termux-api

import { exec } from "child_process";

export interface VolumeSettings {
  /**
   * The type of audio stream.
   * @example "music"
   */
  stream: string;

  /**
   * The current volume level of the audio stream.
   * @example 43
   */
  volume: number;

  /**
   * The maximum volume level of the audio stream.
   * @example 150
   */
  max_volume: number;
}

export interface VolumeOptions {
  /**
   * Audio stream to change the volume of
   */
  stream: "alarm|" | "music" | "notification" | "ring" | "system" | "call";
  /**
   * Volume level to set the stream to
   */
  volume: number;
}

/**
 * Show information about each audio stream
 */
export async function volumeInfo(): Promise<VolumeSettings[]> {
  return new Promise<VolumeSettings[]>((resolve, reject) => {
    const command = `termux-volume`;
    exec(command, (error, stdout, stderr) => {
      if (error) {
        return reject(`Error: ${error.message}`);
      }
      if (stderr) {
        return reject(`Error: ${stderr}`);
      }
      const output = stdout.trim();
      const settings: VolumeSettings[] = JSON.parse(stdout);
      return resolve(settings);
    });
  });
}

/**
 * Change volume of audio stream
 */
export async function volume(options: VolumeOptions): Promise<void> {
  return new Promise<void>((resolve, reject) => {
    const command = `termux-volume ${options.stream} ${options.volume}`;
    exec(command, (error, stdout, stderr) => {
      if (error) {
        return reject(`Error: ${error.message}`);
      }
      if (stderr) {
        return reject(`Error: ${stderr}`);
      }
      return resolve();
    });
  });
}