lens/src/common/utils/find-exactly-one/find-exactly-one.ts

/**
 * Copyright (c) OpenLens Authors. All rights reserved.
 * Licensed under MIT License. See LICENSE in root directory for more information.
 */
export const findExactlyOne = <T>(predicate: (item: T) => boolean) => (collection: T[]): T => {
  const itemsFound = collection.filter(predicate);

  if (!itemsFound.length) {
    throw new Error(
      "Tried to find exactly one, but didn't find any",
    );
  }

  if (itemsFound.length > 1) {
    throw new Error(
      "Tried to find exactly one, but found many",
    );
  }

  return itemsFound[0];
};