/**
 * Verifies object keys satisfy required and optional keys specification.
 *
 * @param { object } obj - Object to perform key verification on.
 * @param { string[] | {
 *     required?: string[];
 *     optional?: string[];
 * } } keys - Expected `required` and `optional` keys to be present in the object. Optional keys verification is only performed for `strict = true`. As an array, `keys` represents the required keys only.
 * @param { boolean } [strict = true] - Whether non-required keys are allowed. If optional keys are specified, object's non-required keys must be `optional` keys. Defaults to `true`.
 * @returns { boolean }
 */
export function everyKeyInObject(obj: object, keys: string[] | {
    required?: string[];
    optional?: string[];
}, strict?: boolean): boolean;
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