@modular-forms/solid/dist/source/validation/required.js

The modular and type-safe form library for SolidJS

/**
 * Creates a validation function that checks the existence of an input.
 *
 * @param error The error message.
 *
 * @returns A validation function.
 */
export function required(error) {
    return (value) => (!value && value !== 0) || (Array.isArray(value) && !value.length)
        ? error
        : '';
}