export declare type DeepPartial<T> = {
    [P in keyof T]?: DeepPartial<T[P]>;
};
export declare function lastItem<T>(arr: ReadonlyArray<T>): T;
export declare function removeItem<Arr extends ReadonlyArray<T>, T>(arr: Arr, item: T): Arr;
export declare function removeItemOrNever<Arr extends ReadonlyArray<T>, T>(arr: Arr, item: T): Arr;
export declare function never(value?: never): never;
export declare function sleep(ms: number): Promise<{}>;
export declare function verifySignature(data: string, signatureBase64: string, publicKey: string): boolean;
export declare function normalToWebSafeBase64(normalBase64: string): string;
export declare function webSafeToNormalBase64(safeBase64: string): string;
export declare function getEnv(name: string): string;
export declare function getEnvNullable(name: string): string | undefined;
export declare function nonNull<T>(value: T | undefined | null): T;
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