TS2663

error TS2663: Cannot find name ‘firstName‘. Did you mean the instance member ‘this.firstName‘?

Broken Code ❌

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class Person {
  get firstName(): string {
    return firstName;
  }
}

Fixed Code ✔️

If you want to use a getter, you need to back it up with a private property:

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class Person {
  private _firstName: string = '';

  get firstName(): string {
    return this._firstName;
  }
}

Starting from TypeScript 4.9, you can also use an auto-accessor field:

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class Person {
  accessor firstName: string = '';
}