githubmirror/immutable-js

src/predicates/isStack.ts

14 строк485 B

Julien Deniau

import comments into TS files

23 фев 2025, 22:59

23 фев 2025, 22:59c16cbcf

import type { Stack } from '../../type-definitions/immutable';

export const IS_STACK_SYMBOL = '@@__IMMUTABLE_STACK__@@';

/**
 * True if `maybeStack` is a Stack.
 */
export function isStack(maybeStack: unknown): maybeStack is Stack<unknown> {
  return Boolean(
    maybeStack &&
      // @ts-expect-error: maybeStack is typed as `{}`, need to change in 6.0 to `maybeStack && typeof maybeStack === 'object' && MAYBE_STACK_SYMBOL in maybeStack`
      maybeStack[IS_STACK_SYMBOL]
  );
}