Function fadeSound

app/core/store/modules/audio.js:437–452

* Fades a sound between two volumes. * * @param opts {object} * @param opts.id {string} sound to fade * @param opts.from {number|undefined} start volume between 0 and 1. If undefined starts at current volume. * @param opts.to {number} finish volume between 0 and 1 * @p

({ getters }, { id, from, to, duration })

     * @throws {Error} when invalid ID specified
     */
    fadeSound ({ getters }, { id, from, to, duration }) {
      const sound = getters.getSoundById(id)
      if (!sound) {
        throw new Error('Sound not found')
      }

      if (typeof from === 'undefined') {
        from = sound.volume()
      }

      return new Promise((resolve) => {
        sound
          .once('fade', () => resolve(id))
          .fade(from, to, duration)
      })
    },

    /**
     * Sets volume of all tracks