export declare function repeat(s: string, times: number): string;
export declare function setInternalSlot<
	Instance extends object,
	Internal extends object,
	Field extends keyof Internal
>(map: WeakMap<Instance, Internal>, pl: Instance, field: Field, value: NonNullable<Internal>[Field]): void;
export declare function setMultiInternalSlots<
	Instance extends object,
	Internal extends object,
	K extends keyof Internal
>(map: WeakMap<Instance, Internal>, pl: Instance, props: Pick<NonNullable<Internal>, K>): void;
export declare function getInternalSlot<
	Instance extends object,
	Internal extends object,
	Field extends keyof Internal
>(map: WeakMap<Instance, Internal>, pl: Instance, field: Field): Internal[Field];
export declare function getMultiInternalSlots<
	Instance extends object,
	Internal extends object,
	Field extends keyof Internal
>(map: WeakMap<Instance, Internal>, pl: Instance, ...fields: Field[]): Pick<Internal, Field>;
export interface LiteralPart {
	type: "literal";
	value: string;
}
export declare function isLiteralPart(patternPart: LiteralPart | {
	type: string;
	value?: string;
}): patternPart is LiteralPart;
export declare function defineProperty<T extends object>(target: T, name: string | symbol, { value }: {
	value: any;
} & ThisType<any>): void;
/**
* 7.3.5 CreateDataProperty
* @param target
* @param name
* @param value
*/
export declare function createDataProperty<T extends object>(target: T, name: string | symbol, value: any): void;
export declare const UNICODE_EXTENSION_SEQUENCE_REGEX: RegExp;
export declare function invariant(condition: boolean, message: string, Err?: any): asserts condition;
export declare const createMemoizedNumberFormat: (...args: ConstructorParameters<typeof Intl.NumberFormat>) => Intl.NumberFormat;
export declare const createMemoizedPluralRules: (...args: ConstructorParameters<typeof Intl.PluralRules>) => Intl.PluralRules;
export declare const createMemoizedLocale: (...args: ConstructorParameters<typeof Intl.Locale>) => Intl.Locale;
export declare const createMemoizedListFormat: (...args: ConstructorParameters<typeof Intl.ListFormat>) => Intl.ListFormat;