What is the reason behind the lack of exported interfaces in the redux-form typings?

I've been exploring how to create custom input fields for redux-form.

My journey began by examining the Material UI example found in the documentation here.

const renderTextField = ({input, label, meta: { touched, error }, ...custom }) =>
    <TextField
        hintText={label}
        floatingLabelText={label}
        errorText={touched && error}
        {...input}
        {...custom}
    />

Afterwards, I delved into the definitely typed type definitions for redux-form and discovered the interfaces that define what I needed here.

interface WrappedFieldProps {
    input: WrappedFieldInputProps;
    meta: WrappedFieldMetaProps;
}

However, it seems that they are not exported which raised a question - how do I incorporate this interface into a renderField function if I cannot access it?

I am considering whether I may be taking the wrong approach or overlooking something obvious.

It seems unlikely that the official documentation is incorrect, so could there be an issue with the type definitions not being exported properly?

One workaround could involve having the render function accept props:any, but this would essentially nullify the purpose of the type definitions!

const renderTextField = (props:any) => {
    const {input, label, meta: { touched, error }, ...custom } = props;

    return (
        <TextField
            hintText={label}
            floatingLabelText={label}
            errorText={touched && error}
            {...input}
            {...custom}
        />
    );
}

This means that not only can I not utilize the interfaces in my own code, but they also wouldn't be leveraged when passing the function to

<Field component={renderTextField} />
.

Answer №1

Through some experimentation, I made an interesting discovery - it is possible to import interfaces even when they are not being exported!

Initially, my code looked like this:

import * as ReduxForm from "redux-form";
, which imported the module under the name ReduxForm.

Upon exploring what was accessible on ReduxForm, I found that only the exported parts of the module were available.

However, by using an import statement that specifically requests the non-exported interface like so:

import { WrappedFieldProps } from "redux-form";
, I was able to successfully use that interface!

This situation has left me slightly perplexed, as it contradicts my knowledge of how import/export and modules typically function. Nonetheless, I am relieved to have found a solution.

My next step is to delve into Typescript imports to determine whether this behavior is intentional or a potential bug (my inclination leans towards it being a deliberate feature).

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