/// <amd-module name="@angular/compiler-cli/src/ngtsc/incremental/semantic_graph/src/type_parameters" />
import { ClassDeclaration } from '../../../reflection';
/**
 * Describes a generic type parameter of a semantic symbol. A class declaration with type parameters
 * needs special consideration in certain contexts. For example, template type-check blocks may
 * contain type constructors of used directives which include the type parameters of the directive.
 * As a consequence, if a change is made that affects the type parameters of said directive, any
 * template type-check blocks that use the directive need to be regenerated.
 *
 * This type represents a single generic type parameter. It currently only tracks whether the
 * type parameter has a constraint, i.e. has an `extends` clause. When a constraint is present, we
 * currently assume that the type parameter is affected in each incremental rebuild; proving that
 * a type parameter with constraint is not affected is non-trivial as it requires full semantic
 * understanding of the type constraint.
 */
export interface SemanticTypeParameter {
    /**
     * Whether a type constraint, i.e. an `extends` clause is present on the type parameter.
     */
    hasGenericTypeBound: boolean;
}
/**
 * Converts the type parameters of the given class into their semantic representation. If the class
 * does not have any type parameters, then `null` is returned.
 */
export declare function extractSemanticTypeParameters(node: ClassDeclaration): SemanticTypeParameter[] | null;
/**
 * Compares the list of type parameters to determine if they can be considered equal.
 */
export declare function areTypeParametersEqual(current: SemanticTypeParameter[] | null, previous: SemanticTypeParameter[] | null): boolean;
