Function mergeIf

src/helpers/helpers.core.ts:301–304

(target: T, source: AnyObject[])

export function mergeIf<T, S1, S2, S3, S4>(target: T, source: [S1, S2, S3, S4]): T & S1 & S2 & S3 & S4;
export function mergeIf<T>(target: T, source: AnyObject[]): AnyObject;
export function mergeIf<T>(target: T, source: AnyObject[]): AnyObject {
  // eslint-disable-next-line @typescript-eslint/no-use-before-define
  return merge<T>(target, source, {merger: _mergerIf});
}

/**
 * Merges source[key] in target[key] only if target[key] is undefined.