EC
TS2305
TypeScriptERRORCriticalType SystemHIGH confidence

Member does not exist on type

What this means

A property or method is being accessed on an object, but it is not defined in the object's type.

Why it happens
  1. 1A typo when accessing a property name.
  2. 2Accessing a property on an object that is incorrectly typed.
  3. 3The object is of a union type, and the property does not exist on all types in the union.
How to reproduce

Accessing a non-existent property on a typed object.

trigger — this will error
trigger — this will error
interface User {
  name: string;
  id: number;
}
const user: User = { name: "Alice", id: 1 };
console.log(user.age);

expected output

error TS2339: Property 'age' does not exist on type 'User'.

Fix 1

Correct the property name

WHEN The property name is misspelled.

Correct the property name
interface User {
  name: string;
  id: number;
}
const user: User = { name: "Alice", id: 1 };
console.log(user.id);

Why this works

Using the correct property name defined in the type.

Fix 2

Add the property to the type definition

WHEN The property should be part of the object's shape.

Add the property to the type definition
interface User {
  name: string;
  id: number;
  age: number;
}
const user: User = { name: "Alice", id: 1, age: 30 };
console.log(user.age);

Why this works

Updating the type definition to include the missing property.

What not to do

✕ Use a type assertion to 'any'

This bypasses type safety and removes the benefit of using TypeScript to catch such errors.

Sources
Official documentation ↗

microsoft/TypeScript src/compiler/diagnosticMessages.json

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