How to fix Accessor is not valid here in TypeScript

TypeScriptBEGINNERMEDIUMUpdated Dec 8, 2025· 120 views

This error occurs when you try to use getter or setter syntax in a context where TypeScript does not allow it, such as in object literals, declaration files, or with invalid syntax patterns. Accessors have strict placement rules in TypeScript and can only be defined in class bodies or certain interface contexts. Understanding where accessors are valid prevents syntax errors and ensures proper encapsulation.

Quick fix

Fixes Accessor is not valid here

// WRONG - accessor in object literal
const user = {
  _age: 25,
  get age() {  // Error: Accessor is not valid here
    return this._age;
  }
};

// CORRECT - accessor in class
class User {
  private _age = 25;
  
  get age() {
    return this._age;
  }
}

const user = new User();
console.log(user.age); // 25
  1. Identify the line with the error
  2. Move the accessor into a class body
  3. Use a regular property method instead of accessor if appropriate
  4. Check that you are using valid accessor syntax in classes
typescript — error
// WRONG - accessor in object literal
const user = {
  _age: 25,
  get age() {  // Error: Accessor is not valid here
    return this._age;
  }
};
// CORRECT - accessor in class
class User {
  private _age = 25;
  
  get age() {
    return this._age;
  }
}
const user = new User();
console.log(user.age); // 25
Accessor is not valid here

What this error means

TypeScript accessors (getters and setters) are special class members that allow you to intercept property access and modifications. However, they can only be used in specific contexts: class bodies and certain TypeScript-specific declarations. When you try to define an accessor in an invalid location—such as inside an object literal, in a function, at the module level, or in a declaration file without proper context—TypeScript raises this error. The error message indicates that the accessor syntax (get/set keywords) has been used in a place where TypeScript does not expect or allow it. This is fundamentally a structural issue with where you have placed your code, not a logic error.

Typical symptoms

  • Compiler error "Accessor is not valid here" appearing when using get or set keywords
  • Red underlines on getter or setter definitions in your IDE
  • Build fails during TypeScript compilation with this specific error message
  • Error appears near get or set keyword in non-class contexts
  • Accessor definition in object literals or function bodies causing compiler to reject the code

Common causes

  1. Defining a getter or setter inside an object literal instead of a class body
  2. Using accessor syntax in a plain object type or interface literal
  3. Attempting to use get or set keywords at module level outside of a class
  4. Placing accessor definitions inside a function or arrow function
  5. Using accessor syntax in a declaration file (*.d.ts) without proper class wrapping
  6. Mixing property and accessor declarations in object literals
  7. Using invalid syntax like "get" or "set" as a property name without it being a true accessor

How to fix "Accessor is not valid here"

1Identify the line with the error

Look at the error message in your TypeScript compiler output or IDE. It will point to the exact line where the accessor is defined. Note whether you are using get or set keyword and what context it appears in (inside braces, at module level, etc.).

2Move the accessor into a class body

Accessors are only valid in class definitions. If you have a getter or setter in an object literal or at module level, you must wrap it in a class.

typescript
// WRONG - accessor in object literal
const user = {
  _age: 25,
  get age() {  // Error: Accessor is not valid here
    return this._age;
  }
};

// CORRECT - accessor in class
class User {
  private _age = 25;
  
  get age() {
    return this._age;
  }
}

const user = new User();
console.log(user.age); // 25
3Use a regular property method instead of accessor if appropriate

If you only need a getter without the encapsulation benefits of a class, you can use a regular function property or a method instead of an accessor.

typescript
// Alternative: use a method instead of getter
const user = {
  _age: 25,
  getAge() {  // Use a method instead
    return this._age;
  },
  setAge(age: number) {  // Separate setter method
    this._age = age;
  }
};

console.log(user.getAge()); // 25
user.setAge(30);
4Check that you are using valid accessor syntax in classes

Ensure your accessor follows the correct TypeScript syntax. The get or set keyword must directly precede a method name (not a function keyword).

typescript
// WRONG - using function keyword with accessor
class User {
  get function age() {  // Error: invalid syntax
    return this._age;
  }
}

// CORRECT - no function keyword
class User {
  get age() {  // Correct accessor syntax
    return this._age;
  }
}
5Verify the accessor is not in a declaration file without a class

In declaration files (*.d.ts), accessors must be inside a class or type definition. You cannot declare accessors at the module level in declaration files.

typescript
// user.d.ts - WRONG
get age(): number;  // Error: Accessor is not valid here

// user.d.ts - CORRECT
declare class User {
  get age(): number;
}
6Use readonly properties as an alternative for simple read-only values

If you need a property that cannot be modified after initialization, you can use readonly instead of creating a getter.

typescript
class User {
  readonly age: number;  // Simple and clean
  
  constructor(age: number) {
    this.age = age;
  }
}

// Or with a getter for computed values
class User {
  private _birthYear: number;
  
  get age(): number {  // Computed from birthYear
    return new Date().getFullYear() - this._birthYear;
  }
}

Advanced notes

Accessors in TypeScript are syntactic sugar that compile to getter and setter functions in the emitted JavaScript. They are strictly class-level members and cannot be used in other contexts because JavaScript itself only supports accessors on object literals and class bodies, not at module level. If you are working with third-party types that seem to use accessor syntax in unexpected places, you may be looking at a type definition issue; check the declaration file to understand the intended structure. In some cases, you might want to use a factory function that returns an object with a proxy to intercept property access, but this is more complex than using a simple class. Remember that accessors are only available when targeting ES5 or higher in your TypeScript configuration; if you target ES3 or ES4, you cannot use accessors at all.

Frequently asked questions

What does "Accessor is not valid here" mean?
TypeScript accessors (getters and setters) are special class members that allow you to intercept property access and modifications. However, they can only be used in specific contexts: class bodies and certain TypeScript-specific declarations. When you try to define an accessor in an invalid location—such as inside an object literal, in a function, at the module level, or in a declaration file without proper context—TypeScript raises this error.
How do I fix "Accessor is not valid here"?
This error occurs when you try to use getter or setter syntax in a context where TypeScript does not allow it, such as in object literals, declaration files, or with invalid syntax patterns. Accessors have strict placement rules in TypeScript and can only be defined in class bodies or certain interface contexts. Understanding where accessors are valid prevents syntax errors and ensures proper encapsulation.
What causes "Accessor is not valid here"?
Defining a getter or setter inside an object literal instead of a class body Using accessor syntax in a plain object type or interface literal Attempting to use get or set keywords at module level outside of a class
Is the "Accessor is not valid here" error serious?
It is a medium-severity error — more of a blocker than a risk. The steps above resolve it.

Official resources & further reading