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import { GraphQLSchema } from '../type/schema.d.ts';import { GraphQLType, GraphQLCompositeType } from '../type/definition.d.ts';
/** * Provided two types, return true if the types are equal (invariant). */export function isEqualType(typeA: GraphQLType, typeB: GraphQLType): boolean;
/** * Provided a type and a super type, return true if the first type is either * equal or a subset of the second super type (covariant). */export function isTypeSubTypeOf(  schema: GraphQLSchema,  maybeSubType: GraphQLType,  superType: GraphQLType,): boolean;
/** * Provided two composite types, determine if they "overlap". Two composite * types overlap when the Sets of possible concrete types for each intersect. * * This is often used to determine if a fragment of a given type could possibly * be visited in a context of another type. * * This function is commutative. */export function doTypesOverlap(  schema: GraphQLSchema,  typeA: GraphQLCompositeType,  typeB: GraphQLCompositeType,): boolean;