/** True for plain objects (including `Object.create(null)`), false for arrays, `Date`, etc. */
export declare function isPlainObject(value: unknown): value is Record<string, unknown>;
/**
 * Assigns own enumerable properties of `source` onto `target` only where `target[key] === undefined`
 * (lodash `defaults` semantics).
 */
export declare function assignDefaults<T extends Record<string, unknown>>(target: T, source: Record<string, unknown>): void;
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