Matching the appropriate data type for interface attributes

In the process of developing a module (module1), I have defined the following interface type:

interface ModuleOneInterface {
    keyOne: customInterface;
    keyTwo: customInterface;
    keyThree: customInterface;
}

Now, as I work on another module (module2), I need to use the above interface as a prop in one of its components. However, since the interface is not exported from module1, I am unable to import it into module2. I attempted to create a new interface that represents the type needed in module2. Here is what I came up with:

export interface ModuleTwoInterface {
    //This interface accommodates the module one interface
    module2KeyOne: Record<string, customInterface>; 
    module2KeyTwo: string;
}

Unfortunately, this resulted in the following error:

TS2345: Argument of type 'ModuleOneInterface' is not assignable to parameter 
        of type 'Record<string, customInterface>'.

I also tried an alternative solution, but it didn't solve the issue either:

interface moduleTwoSubInterface {
    [key: string]: customInterface;
}

export interface ModuleTwoInterface {
    // This interface also aims to accommodate the module one interface
    module2KeyOne: moduleTwoSubInterface; 
    module2KeyTwo: string;
}

If anyone has any insights or suggestions, they would be greatly appreciated.

Answer №1

type and interface can often be used interchangeably, but there are exceptions.

If an interface does not have an index signature, it cannot extend anything that has an index signature, making it unassignable.
On the other hand, a type alias can extend any target type (using type or interface) with an index signature, as long as all properties align with the index signature. For example, if the index signature is from string to Foo, then all properties must be able to extend Foo.

For a demonstration, check out this playground example: link

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