server/src/Utils.ts

export default class Utils {
  public static isStrUsable(value: any, keys: string = '') {
    return this.isUsable(value, keys, true)
  }

  public static isUsable(value: any, keys: string = '', isStr = false) {
    let bool: boolean = value !== undefined && value !== null
    if (keys === '') {
      if (isStr) { bool = bool && typeof value === 'string' && value.length > 0 }
      return bool
    }
    let parts: string[] = keys.split('.')
    let levels: number = parts.length
    let explored: any = null
    for (var i = 0; i < levels + 1; i++) {
      explored = explored === null ? value : explored[parts[i - 1]]
      bool = bool && (
        explored !== undefined && explored !== null
      )
    }
    if (isStr) {
      bool = bool && typeof explored === 'string' && explored.length > 0
    }
    return bool
  }
}