export declare function DCHECK(bool: boolean): void;
export declare function DCHECK_EQ(a: any, b: any): void;
export declare function DCHECK_NE(a: any, b: any): void;
export declare function isFunction(func: any): func is (...args: any[]) => any;
export declare function isSymbol(value: any): value is symbol;
export declare const definedProps: (obj: Record<string, unknown>) => {
    [k: string]: unknown;
};
export declare const formatAttributeName: {
    (...args: any[]): any;
    cache: Map<any, any>;
};
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