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Javascript – How to omit 3 levels inner key in typescript?

Giving following typescript code. how would you omit the email that is inside options and inside data?

interface SignUpObject {
  email:string, // not this one
  password: string,
  options: {
    emailRedirectTo: string,
    captchaToken?: string,
    data: {
      preferedLanguage: number
      name: string
      email: string // but this one!
      agreeTermsCheckbox: boolean
      whatJobYouHave: number
      birthday: string
      techYearsOfExpierence: string
      is_subscriber: boolean
      is_admin: boolean
      subscriber_expiration_timestamp: string | null
    }
  }
}

I already omit password:

interface UpdateUserData extends Omit<SignUpObject, 'password'> {
  password?: string
}

I try search online, reading the docs, looking in forums and more

Tags:

2

Answers


  1. 0

    Overwrite options.data as you did for password field:

    interface UpdateUserData extends Omit<SignUpObject, 'password' | 'options'> {
  password?: string;
  options: Omit<SignUpObject['options'], 'data'>
  & {
    data: Omit<SignUpObject['options']['data'], 'email'>
  }
}
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  2. 0

    You could use a recursive generic type to filter a particular object path out:

    export type Leaves<T> = T extends object ? { [K in keyof T]:
    `${Exclude<K, symbol>}${Leaves<T[K]> extends never ? "" : `.${Leaves<T[K]>}`}`
}[keyof T] : never

type OmitPath<T, P extends Leaves<T>> = T extends object ? 
  P extends keyof T ? 
    { [K in Exclude<keyof T, P>]: T[K] } : 
      { [K in keyof T]: 
        P extends `${Exclude<K, symbol>}.${infer R extends Leaves<T[K]>}` ? 
        OmitPath<T[K], R> : T[K]}
: never;

type SignUp = OmitPath<SignUpObject, 'options.data.email'>

    Playground

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