/**
 * Represents an RGBA color with mutable channels.
 */
export declare class RgbColor {
    r: number;
    g: number;
    b: number;
    a: number;
    constructor(r: number, g: number, b: number, a?: number);
    update(key: 'r' | 'g' | 'b' | 'a', value: number): RgbColor;
    toString(): string;
}
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