Resolving method value is not a member of Error When Importing JavaScript Modules in Scala.js

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The Problem at Hand

[[See Video to Reveal this Text or Code Snippet]]

When trying to run your application, you encounter the following errors:

value add is not a member of example.MyType

value divide is not a member of example.MyType

This indicates that Scala does not recognize the methods add and divide as part of the MyType class.

Understanding the Issue

Key Concepts to Remember

Native Method Declaration: When you define methods in a class that extend js.Object, you must specify them appropriately so they can be recognized as methods implemented in the JavaScript layer.

The Solution

Revised Code

Replace your existing code for MyType with the following:

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Explanation of Changes

Using def with Return Type: The methods add and divide now include the def keyword, specifying them as methods. This inclusion is crucial for Scala to understand that they are methods rather than constructor arguments or field declarations.

Return Type Specification: Each method now has a return type Double, which mirrors the expected return value from your JavaScript implementation. This clarity helps maintain type safety and proper importing.

Conclusion