How to use the @adonisjs/ace.flags.string function in @adonisjs/ace

import { inject } from '@adonisjs/fold'
import { BaseCommand, flags } from '@adonisjs/ace'
import { DatabaseContract } from '@ioc:Adonis/Lucid/Database'
import { ApplicationContract } from '@ioc:Adonis/Core/Application'
import { MigrationListNode } from '@ioc:Adonis/Lucid/Migrator'

/**
 * The command is meant to migrate the database by execute migrations
 * in `up` direction.
 */
@inject([null, 'Adonis/Lucid/Database'])
export default class Status extends BaseCommand {
  public static commandName = 'migration:status'
  public static description = 'Drop existing tables and re-run migrations from start'

  @flags.string({ description: 'Define a custom database connection' })
  public connection: string

  /**
   * This command loads the application, since we need the runtime
   * to find the migration directories for a given connection
   */
  public static settings = {
    loadApp: true,
  }

  constructor (app: ApplicationContract, private _db: DatabaseContract) {
    super(app)
  }

  /**
   * Colorizes the status string

* Pre select migration directory. If this is defined, we will ignore the paths
   * defined inside the config.
   */
  @flags.string({ description: 'Pre-select a migration directory' })
  public folder: string

  /**
   * Custom table name for creating a new table
   */
  @flags.string({ description: 'Define the table name for creating a new table' })
  public create: string

  /**
   * Custom table name for altering an existing table
   */
  @flags.string({ description: 'Define the table name for altering an existing table' })
  public table: string

  /**
   * This command loads the application, since we need the runtime
   * to find the migration directories for a given connection
   */
  public static settings = {
    loadApp: true,
  }

  constructor (app: ApplicationContract, private _db: DatabaseContract) {
    super(app)
  }

  /**
   * Returns the directory for creating the migration file

import { inject } from '@adonisjs/fold'
import { DatabaseContract } from '@ioc:Adonis/Lucid/Database'
import { ApplicationContract } from '@ioc:Adonis/Core/Application'

import MigrationsBase from './MigrationsBase'

/**
 * The command is meant to migrate the database by execute migrations
 * in `up` direction.
 */
@inject([null, 'Adonis/Lucid/Database'])
export default class Migrate extends MigrationsBase {
  public static commandName = 'migration:rollback'
  public static description = 'Rollback migrations to a given batch number'

  @flags.string({ description: 'Define a custom database connection' })
  public connection: string

  @flags.boolean({ description: 'Print SQL queries, instead of running the migrations' })
  public dryRun: boolean

  @flags.number({
    description: 'Define custom batch number for rollback. Use 0 to rollback to initial state',
  })
  public batch: number

  /**
   * This command loads the application, since we need the runtime
   * to find the migration directories for a given connection
   */
  public static settings = {
    loadApp: true,

import { inject } from '@adonisjs/fold'
import { DatabaseContract } from '@ioc:Adonis/Lucid/Database'
import { ApplicationContract } from '@ioc:Adonis/Core/Application'

import MigrationsBase from './MigrationsBase'

/**
 * The command is meant to migrate the database by execute migrations
 * in `up` direction.
 */
@inject([null, 'Adonis/Lucid/Database'])
export default class Migrate extends MigrationsBase {
  public static commandName = 'migration:run'
  public static description = 'Run pending migrations'

  @flags.string({ description: 'Define a custom database connection' })
  public connection: string

  @flags.boolean({ description: 'Print SQL queries, instead of running the migrations' })
  public dryRun: boolean

  /**
   * This command loads the application, since we need the runtime
   * to find the migration directories for a given connection
   */
  public static settings = {
    loadApp: true,
  }

  constructor (app: ApplicationContract, private _db: DatabaseContract) {
    super(app)
  }