How to use the electron-installer-common.mergeUserSpecified function in electron-installer-common

if (!this.options.description && !this.options.productDescription) {
      throw new Error("No Description or ProductDescription provided. Please set either a description in the app's package.json or provide it in the this.options.")
    }

    if (this.options.description) {
      this.options.description = this.normalizeDescription(this.options.description)
    }

    if (this.options.productDescription) {
      this.options.productDescription = this.normalizeExtendedDescription(this.options.productDescription)
    }

    // Create array with unique values from default & user-supplied dependencies
    for (const prop of ['depends', 'recommends', 'suggests', 'enhances', 'preDepends']) {
      this.options[prop] = common.mergeUserSpecified(this.userSupplied, prop, this.defaults)
    }

    return this.options
  }

if (!this.options.description && !this.options.productDescription) {
      throw new Error("No Description or ProductDescription provided. Please set either a description in the app's package.json or provide it in the options.")
    }

    if (this.options.description) {
      // Do not end with a period
      this.options.description = this.options.description.replace(/\.*$/, '')
    }

    // Wrap the extended description to avoid rpmlint warning about
    // `description-line-too-long`.
    this.options.productDescription = wrap(this.options.productDescription, { width: 80, indent: '' })

    // Merges user and default dependencies
    this.options.requires = common.mergeUserSpecified(this.userSupplied, 'requires', this.defaults)

    this.normalizeVersion()
  }