react-bootstrap/cjs/types.d.ts

export declare type Variant = 'primary' | 'secondary' | 'success' | 'danger' | 'warning' | 'info' | 'dark' | 'light' | string;
export declare type ButtonVariant = Variant | 'link' | 'outline-primary' | 'outline-secondary' | 'outline-success' | 'outline-danger' | 'outline-warning' | 'outline-info' | 'outline-dark' | 'outline-light';
export declare type Color = 'primary' | 'secondary' | 'success' | 'danger' | 'warning' | 'info' | 'dark' | 'light' | 'white' | 'muted';
export declare type EventKey = string | number;