x.ts

export class ValidationFail {
  readonly validateErr: string
  readonly ok: false

  constructor(validateErr: string) {
    this.validateErr = validateErr
    this.ok = false
  }
}
export class ValidationSuccess<T> {
  readonly value: T
  readonly ok: true

  constructor(value: T) {
    this.value = value
    this.ok = true
  }
}
export type ValidateResult<T> = ValidationSuccess<T> | ValidationFail