What is the best way to link to a different module in typescript?

Encountering an issue related to the import and module features in TypeScript version 2.4.1. The problem arises from having two separate files:

testAdd.ts:

module mymodule {
    export class myClassAdd {
        static add(left: number, right: number): number {
            return left + right;
        }
    }
}

testCallAdd.ts:

//import 'someLibrary';

module mymodule {
    export class myClassCallAdd {
        static callAdd(): void {
            let result: number = mymodule.myClassAdd.add(3, 4); //error here
        }
    }
}

Currently, the code compiles without any issues. However, upon attempting to import a library using the import statement, errors start to occur. Uncommenting the import line in testCallAdd.ts triggers an error stating that myClassAdd does not exist on type typeof mymodule.

The reason behind this error is unclear along with its solution. It appears that the import statement interferes with the compiler's visibility of testAdd.ts. Seeking guidance on resolving this issue and understanding the root cause.

This problem arose while working on an Angular website that functions properly but requires testing using Jasmine. Struggling to establish a setup enabling both the Angular framework and unit tests to access the shared codebase.

Answer №1

To address your situation, it is recommended to utilize the triple-slash directive like so:

/// <reference types="somelibrary" />

Take a look at this resource for more information on triple-slash directives: http://www.typescriptlang.org/docs/handbook/triple-slash-directives.html

It would be advisable to consider utilizing a module system instead of a namespace, which seems to be your current approach.

For further understanding of modules and namespaces, check out these links: http://www.typescriptlang.org/docs/handbook/namespaces-and-modules.html

If you do decide to proceed with namespaces, keep in mind that since TypeScript 1.5, the syntax module mymodule { ... } has been deprecated in favor of namespace mymodule { ... }

Additional resources: http://www.typescriptlang.org/docs/handbook/namespaces.html https://github.com/unional/typescript-guidelines/blob/master/pages/default/namespaces-and-modules.md

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