remeda
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A utility library for JavaScript and Typescript.
18 lines (16 loc) • 500 B
text/typescript
/**
* A function that checks if the passed parameter is defined (`!== undefined`)
* and narrows its type accordingly.
*
* @param data - The variable to check.
* @returns True if the passed input is defined, false otherwise.
* @signature
* R.isDefined(data)
* @example
* R.isDefined('string') //=> true
* R.isDefined(null) //=> true
* R.isDefined(undefined) //=> false
* @category Guard
*/
declare function isDefined<T>(data: T | undefined): data is T;
export { isDefined };