/**
 * Possible ways of validating an IRI
 */
export declare enum IriValidationStrategy {
    /**
     * Validates the IRI according to RFC 3987.
     */
    Strict = "strict",
    /**
     * Validates that the IRI has a valid scheme and does not contain any character forbidden by the Turtle specification.
     */
    Pragmatic = "pragmatic",
    /**
     * Does not validate the IRI at all.
     */
    None = "none"
}
/**
 * Validate a given IRI according to the given strategy.
 *
 * By default the IRI is fully validated according to RFC 3987.
 * But it is possible to do a lighter a faster validation using the "pragmatic" strategy.
 *
 * @param {string} iri a string that may be an IRI.
 * @param {IriValidationStrategy} strategy IRI validation strategy.
 * @return {Error | undefined} An error if the IRI is invalid, or undefined if it is valid.
 */
export declare function validateIri(iri: string, strategy?: IriValidationStrategy): Error | undefined;