Property ‘getcontext’ does not exist on type ‘never’.

      const person = {
        name: "John",
        age: 30
      };

      person.getcontext(); // Property 'getcontext' does not exist on type 'never'.

      If you are getting an error message saying "Property 'getcontext' does not exist on type 'never'", it means that you are trying to access a property or method on a value that TypeScript cannot narrow down to a specific type.

      This error usually occurs when you don't provide enough information to let TypeScript infer the type of a variable or when you are working with union types where a property or method doesn't exist on all possible types.

      To fix this error, you can do the following:

      1. Make sure you have provided enough information for TypeScript to infer the type. For example, instead of using the 'never' type, provide a specific type:

      interface Person {
        name: string;
        age: number;
      }

      const person: Person = {
        name: "John",
        age: 30
      };

      Now TypeScript knows that the 'person' variable is of type 'Person' and it will correctly check for the existence of properties and methods.

      person.getcontext(); // Error: Property 'getcontext' does not exist on type 'Person'.

      2. If you are working with union types, you can use type guards or type assertions to narrow down the type before accessing the property or method:

      interface Person {
        name: string;
        age: number;
        getcontext?(): void;
      }

      function doSomething(value: Person | null) {
        if (value && typeof value.getcontext === 'function') {
          value.getcontext(); // No error because TypeScript knows that 'value' has a 'getcontext' method.
        }
      }

      const person: Person = {
        name: "John",
        age: 30,
        getcontext() {
          console.log("Hello");
        }
      };

      doSomething(person); // Hello

      In this example, we check if the 'value' variable exists and if its 'getcontext' property is of type 'function'. If both conditions are true, TypeScript can safely access the 'getcontext' method without throwing an error.

      By following these guidelines, you can fix the "Property 'getcontext' does not exist on type 'never'" error and ensure that TypeScript verifies the correctness of your code.