Error message: Failure to define class methods when exporting the class from a file

Question

Error message: Failure to define class methods when exporting the class from a file

In my project, I have defined a class called BinarySearchTree in a file named a.js. This class has been exported and then imported into another file where it is used as the parent class for a different class called Traversal. However, I encountered an issue where the methods present in the parent class are not accessible in the child class. This results in an error message:

Error TS2339: Property 'getRootNode' does not exist on type 'Traversal'.

It's interesting to note that when I placed both classes in the same file, there were no errors.

Although I am comfortable with ES Standards, Typescript is relatively new to me. Please let me know if I missed any important details or if there is a workaround for this issue.

Here is the code snippet:

export class BinarySearchTree 
{
    root: any; 
    constructor() 
    { 
        // root of a binary seach tree 
        this.root = null; 
    } 

    getRootNode() 
    { 
        return this.root; 
    }
}

b.ts

import { BinarySearchTree } from './a.ts';

export class Traversal extends BinarySearchTree{
    constructor() 
    { 
        super()
    } 
}

var _traversal = new Traversal();
_traversal.getRootNode()

javascript typescript ecmascript-6

Answer 1

Answer №1

give this a shot

 function() {
    let num = 456;
    let func = this.func.bind(this);
   }

   func() {
      console.log('attempt')
   }

You now have the ability to utilize func() within this component.

In this example, I've defined a method called func, which corresponds to func() in the current context. By using the this keyword, we can reference the encapsulated class and access its properties.

Answer 2

give this a shot

 function() {
    let num = 456;
    let func = this.func.bind(this);
   }

   func() {
      console.log('attempt')
   }

You now have the ability to utilize func() within this component.

In this example, I've defined a method called func, which corresponds to func() in the current context. By using the this keyword, we can reference the encapsulated class and access its properties.

Error message: Failure to define class methods when exporting the class from a file

Answer №1

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