declare const _map: unique symbol;
/**
 * Contains contextual information relating to a {@link Conversion}; either globally or a limited scope single element
 * conversion.
 *
 * The scope of entries can be restricted further by using symbols as keys.
 */
export declare class ConversionContext {
    private readonly [_map];
    /**
     * Deletes the entry for the specified `key` from this {@link ConversionContext}.
     *
     * @param key - The key whose entry is to be deleted.
     * @return A reference to this {@link ConversionContext} for chaining purposes.
     */
    delete(key: ConversionContextKey): this;
    /**
     * Iterates over all non-private entries within this {@link ConversionContext}, calling `callback` for each entry.
     *
     * Private entries are those set using a symbol as a key.
     *
     * @param callback - The function to be called for each non-private entry.
     * @return A reference to this {@link ConversionContext} for chaining purposes.
     */
    forEach(callback: (key: string, value: any) => void): this;
    /**
     * Returns the value of the entry with the specified `key` within this {@link ConversionContext}.
     *
     * An error is thrown if no entry was found for `key`.
     *
     * @param key - The key of the entry whose value is to be returned.
     * @return The entry value for `key`.
     * @throws If no entry exists for `key`.
     */
    get<T = any>(key: ConversionContextKey): T;
    /**
     * Returns whether an entry for the specified `key` exists within this {@link ConversionContext}.
     *
     * @param key - The key to be checked.
     * @return A reference to this {@link ConversionContext} for chaining purposes.
     */
    has(key: ConversionContextKey): boolean;
    /**
     * Returns the keys for all non-private entries within this {@link ConversionContext}.
     *
     * Private entries are those set using a symbol as a key.
     *
     * @return The keys for non-private entries.
     */
    keys(): string[];
    /**
     * Iterates over all non-private entries within this {@link ConversionContext}, calling `callback` for each entry in
     * order to map its key/value pair, returning the results of all mapped entries.
     *
     * Private entries are those set using a symbol as a key.
     *
     * @param callback - The function to be called for each non-private entry.
     * @return The mapped non-private entries.
     */
    map<T>(callback: (key: string, value: any) => T): T[];
    /**
     * Sets the value of the entry with the specified `key` within this {@link ConversionContext} to `value`.
     *
     * The entry can be considered private if `key` is a symbol.
     *
     * @param key - The key of the entry whose value is to be set.
     * @param value - The value to be set.
     * @return A reference to this {@link ConversionContext} for chaining purposes.
     */
    set<T = any>(key: ConversionContextKey, value: T): this;
    /**
     * Returns the values for all non-private entries within this {@link ConversionContext}.
     *
     * Private entries are those set using a symbol as a key.
     *
     * @return The values for non-private entries.
     */
    values(): any[];
}
/**
 * A key which can be used to store contextual information within a {@link ConversionContext}.
 *
 * The scope of an entry can be restricted further by using a symbol.
 */
export declare type ConversionContextKey = string | symbol;
export {};