/**
 * A context.
 */
export interface Context<T> {
    /**
     * Gets the context default value.
     *
     * @returns
     */
    getDefault(): T;
    /**
     * Sets the context default value.
     * @param value
     */
    setDefault(value: T): void;
    /**
     * Sets the context default value resolver.
     * @param valueFn
     */
    setDefaultComputed(valueFn: () => T): void;
    /**
     * Gets the context value for a given node.
     * @param node
     */
    get(node: object): T;
    /**
     * Gets node that will provide the context value, or `undefined`
     * if it comes from the default.
     * @param node
     */
    getProviderNode(node: object): object | undefined;
    /**
     * Sets the context value for a given node, effectively making it a provider.
     * @param node
     * @param value
     */
    set(node: object, value: T): void;
    /**
     * Sets the context value resolver for a given node, effectively making it a provider.
     * @param node
     * @param valueFn
     */
    setComputed(node: object, valueFn: () => T): void;
    /**
     * Unsets the context value for a given node, therefore it won't be a provider anymore.
     * @param node
     */
    unset(node: object): void;
    /**
     * Applies a value override while the given function is running and, if a node is returned,
     * sets the node as a provider of the value.
     *
     * @template R
     * @param fn Function to run.
     * @param value Value to apply.
     * @returns The value returned from the function.
     */
    apply<R>(fn: () => R, value: T): R;
    /**
     * Applies a computed value override while the given function is running and, if a node is returned,
     * sets the node as a provider of the computed value.
     *
     * @template R
     * @param fn Function to run.
     * @param value Value to apply.
     * @returns The value returned from the function.
     */
    applyComputed<R>(fn: () => R, valueFn: () => T): R;
}
/**
 * Creates a new context with no default value, thus making its default value undefined.
 *
 * @template T Context value type.
 * @returns
 */
export declare function createContext<T>(): Context<T | undefined>;
/**
 * Creates a new context with a default value.
 *
 * @template T Context value type.
 * @param defaultValue
 * @returns
 */
export declare function createContext<T>(defaultValue: T): Context<T>;