import { Context } from 'react';
/**
 * Construct the react context and make sure we set the display name
 *
 * @param aName   - the display name
 * @param aDefault - optionally a default value
 *
 * @returns the context with mandatory `displayName` field
 */
export declare function createReactContext<T>(aName: string, aDefault?: T): Required<Context<T>>;
/**
 * Returns the display name of a context
 */
export declare const selectDisplayName: (aCtx: Context<any>) => string;
/**
 * Validates that the value is not nil and throws an exception otherwise
 *
 * @param aValue - value to check
 * @param aContext - the context, for debugging purposes
 *
 * @returns the original value, guaranteed that it will not be nil
 */
export declare function assertProvider<T>(aValue: T, aContext: Context<T>, aParentContext?: Context<any>): NonNullable<T>;