ts-data-forge/dist/functional/result/impl/result-is-result.mjs

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import { hasKey } from '../../../guard/has-key.mjs';
import { isRecord } from '../../../guard/is-record.mjs';
import { ErrTypeTagName, OkTypeTagName } from './tag.mjs';

/**
 * Checks whether the provided value is a {@link Result<S, E>}.
 *
 * @example
 *
 * ```ts
 * const okValue = Result.ok('success');
 *
 * const errValue = Result.err(new Error('failure'));
 *
 * const notResult = { $$tag: 'ts-data-forge::Result.ok' };
 *
 * assert.isTrue(Result.isResult(okValue));
 *
 * assert.isTrue(Result.isResult(errValue));
 *
 * assert.isFalse(Result.isResult(notResult));
 * ```
 */
const isResult = (maybeResult) => isRecord(maybeResult) &&
    hasKey(maybeResult, '$$tag') &&
    hasKey(maybeResult, 'value') &&
    (maybeResult.$$tag === ErrTypeTagName || maybeResult.$$tag === OkTypeTagName);

export { isResult };
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