Typescript fails to acknowledge static class methods

I am facing an issue with a typescript function that involves a generic class called "Model" with a static method called "build". Typescript is not recognizing the static methods within the class and displaying errors, although the compiled JavaScript works fine:

export function dataToInstance(model: Model, data: any) {
    if (!data) {
        return data;
    }

    const include = generateIncludeRecurse(model);
    const instance = model.build(data, { isNewRecord: false, raw: false, include });
    restoreTimestamps(data, instance);
    return instance;
}

Error: https://i.sstatic.net/rCN1J.png

I am looking for a solution to make typescript recognize the static methods. I have already attempted using "typeof", but it resulted in errors due to model being an abstract class.

Answer №1

When your function requests a model and specifies what you want to do with it inside the function, declaring that the model is of type Model in TypeScript ensures that each time the function is called, the argument passed as model will have all properties and methods defined in the Model type.

Take a closer look at the Model type. It seems to be a generic type that takes two parameters. Without actually seeing the definition of Model, we can only speculate. The type parameters likely define how the base structure of a Model is combined with extra properties or methods.

Although this code may not belong to you, something like Model<{ build: BuildFn }> signals to TypeScript that the model being handled includes a build property.

Hopefully, this explanation provides some clarity for you.

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