WithPrefix<BaseString, Prefix>;

Overview

The WithPrefix type creates a new string type by prepending a specified prefix to an existing string type. This enables automatic addition of a consistent prefix to string types.

Syntax

type WithPrefix<
  BaseString extends string,
  Prefix extends string,
> = `${Prefix}${BaseString}`;

• BaseString: The base string type to which the prefix will be added.
• Prefix: The prefix to be added.

Examples

Example #1

type FormEventNames = 'submit' | 'reset' | 'change';
type CapitalizedFormEventNames = Capitalize<FormEventNames>;
type FormEventHandlers = WithPrefix<CapitalizedFormEventNames, 'on'>;
// Result: "onSubmit" | "onReset" | "onChange";