/**
 * Checks that all items in an array of scopes are valid.
 * @param scopes List of scopes to validate.
 * @param validScopes Optional subset of scopes to be considered valid;
 * if omitted then all defined scopes are valid.
 * @param allowMultiple Whether to allow multiple space-delimited scopes in a single item.
 * Multiple scopes are supported when requesting a tunnel access token with a combination of scopes.
 * @throws Error if a scope is not valid.
 */
export declare function validateScopes(scopes: string[], validScopes?: string[], allowMultiple?: boolean): void;
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