import type { RawValue } from '../types.js';
export declare function isBooleanOrNull(v: RawValue): v is boolean;
export declare function isDate(v: RawValue): boolean;
export declare function isDateOrNull(v: RawValue | null | undefined): boolean;
export declare function isNumberOrNull(v: RawValue | null | undefined): boolean;
export declare function isNumberOrNullOrNaN(v: RawValue | null | undefined): boolean;
export declare function isStringOrNull(v: RawValue | null | undefined): v is string | null | undefined;
export declare function isSymbolOrNull(v: RawValue | null | undefined): boolean;
export declare function isColorOrNull(v: RawValue | null | undefined): boolean;
export declare function isOpacityOrNull(v: RawValue): boolean;