All files / utils is-array-of-primitives.ts

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const simpleTypes = ["string", "number", "boolean"];
 
export function isArrayOfPrimitives(arr: unknown[]): arr is string[] {
  const firstNotNullItem = arr.find((item) => item !== null);
  const firstNotNullItemType = typeof firstNotNullItem;
 
  if (!simpleTypes.includes(firstNotNullItemType)) {
    return false;
  }
 
  return arr.every(
    (item) => item === null || typeof item === firstNotNullItemType,
  );
}