What are some strategies for exporting methods without resorting to the use of import * as ...?

Imagine having a file structured like this:

// HelperFunctions.ts

export const dateFormat = 'MM/DD/YYYY';

export const isEmpty = (input: string | null | undefined): boolean => {
    if (input == null) {
        return true;
    }
    if (!input) {
        return true;
    }
    return input.trim().length <= 0;
};

export const formatDateTime = (dateTime: Date): string => {
    return moment(dateTime).format(dateFormat);
};

When using these functions in a React Native component, you can import them like this:

import * as Helpers from "../../utils/HelperFunctions";

And then call the functions like so:

if (Helpers.isEmpty(inputText)) ...

Alternatively, you can also import individual methods:

import {isEmpty} from "../../utils/HelperFunctions";

And use them with: if (isEmpty(inputText)) ....

Personally, I find the first method more descriptive because it shows the "class" containing the methods, making it clearer for me when invoking them.


The issue I face is that I always need to define the whole HelperFunctions file and its methods just to be able to use import * as Helpers, which can be tedious. Unlike with objects like:

// Themes.ts

export default {
    primaryTheme: '#ff0000',
    secondaryTheme: '#00ff00',
}

...where intellisense can automatically suggest the import statement:

import Themes from "../../styles/Themes";


Is there a way to structure the HelperFunctions file in a manner that eliminates the need for manually writing the import section, allowing intellisense to auto-import the methods?

Answer №1

Your question has been excellently addressed by your own example using export default:

// HelperFunctions.ts

export const appLocale = 'en-US';

export const isNullOrEmpty = (value: string | null | undefined): boolean => {
    if (value == null) {
        return true;
    }
    if (!value) {
        return true;
    }
    return value.trim().length <= 0;
};

export const formatDateTime = (date: Date): string => {
    return moment(date).format(appLocale);
};

export default {
    appLocale,
    isNullOrEmpty,
    formatDateTime
}

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