es-toolkit
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A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.
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text/typescript
/**
* Converts the first character of string to upper case.
*
* @param {string} str - The string that is to be changed
* @returns {string} - The converted string.
*
* @example
* const convertedStr1 = upperFirst('fred') // returns 'Fred'
* const convertedStr2 = upperFirst('Fred') // returns 'Fred'
* const convertedStr3 = upperFirst('FRED') // returns 'FRED'
*/
declare function upperFirst<T extends string = string>(str?: T): Capitalize<T>;
export { upperFirst };