isRequired()

const isRequired: (value, fieldName) => string;

Validates that a field contains a non-empty value

Parameters

Parameter	Type	Description
value	string	The input value to validate
fieldName	string	The name of the field for error messages

Returns

string

Empty string if valid, error message if invalid

Example

isRequired("", "Email") // Returns: "Email is required."
isRequired("  ", "Email") // Returns: "Email is required."
isRequired("test", "Email") // Returns: ""