/** True for any non-null object, narrowing it to an indexable record. */
export declare function isRecord(value: unknown): value is Record<string, unknown>;
/**
 * True for anything property access works on, functions included. Use this
 * where the value may be a callable third-party handle rather than a plain
 * object; {@link isRecord} covers the plain-object case.
 */
export declare function isObjectLike(value: unknown): value is Record<string, unknown>;
/** True when `value` is one of `list`'s members, narrowing to that union. */
export declare function isMemberOf<T extends string>(list: readonly T[], value: string): value is T;
/** True for a finite integer, narrowing `unknown` to `number`. */
export declare function isInteger(value: unknown): value is number;
/**
 * The `code` a Node system error carries (`ENOENT`, `EACCES`, ...), or
 * `undefined` when the caught value is not one.
 */
export declare function errorCode(error: unknown): string | undefined;
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