/**
 * Defines string constants for authentication schemes supported by tunnel service APIs.
 */
export declare enum TunnelAuthenticationSchemes {
    /**
     * Authentication scheme for AAD (or Microsoft account) access tokens.
     */
    Aad = "aad",
    /**
     * Authentication scheme for GitHub access tokens.
     */
    GitHub = "github",
    /**
     * Authentication scheme for tunnel access tokens.
     */
    Tunnel = "tunnel",
    /**
     * Authentication scheme for tunnelPlan access tokens.
     */
    TunnelPlan = "tunnelplan"
}
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