/**
 * A symbol which can be exposed when you want {@link isPlainObject} to
 * be false for an object.  It doesn't matter what the value is.
 */
export declare const notPlainObject: unique symbol;
/**
 * Guard to check that the given value is defined and object-like.
 */
export declare const isObject: (obj: unknown) => obj is NonNullable<object>;
/**
 * Guard to check that the given value is defined, is an object,
 * and seems to be a "plain" object, descending directly from Object.
 * This won't prevent all shenanigans, but is a low-effort check.
 */
export declare const isPlainObject: (obj: unknown) => obj is Record<never, never>;
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