| 1 | import { GraphQLSchema } from '../type/schema';
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| 2 | import { GraphQLType, GraphQLCompositeType } from '../type/definition';
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| 3 |
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| 4 | /**
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| 5 | * Provided two types, return true if the types are equal (invariant).
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| 6 | */
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| 7 | export function isEqualType(typeA: GraphQLType, typeB: GraphQLType): boolean;
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| 8 |
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| 9 | /**
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| 10 | * Provided a type and a super type, return true if the first type is either
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| 11 | * equal or a subset of the second super type (covariant).
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| 12 | */
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| 13 | export function isTypeSubTypeOf(
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| 14 | schema: GraphQLSchema,
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| 15 | maybeSubType: GraphQLType,
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| 16 | superType: GraphQLType,
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| 17 | ): boolean;
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| 18 |
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| 19 | /**
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| 20 | * Provided two composite types, determine if they "overlap". Two composite
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| 21 | * types overlap when the Sets of possible concrete types for each intersect.
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| 22 | *
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| 23 | * This is often used to determine if a fragment of a given type could possibly
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| 24 | * be visited in a context of another type.
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| 25 | *
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| 26 | * This function is commutative.
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| 27 | */
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| 28 | export function doTypesOverlap(
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| 29 | schema: GraphQLSchema,
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| 30 | typeA: GraphQLCompositeType,
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| 31 | typeB: GraphQLCompositeType,
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| 32 | ): boolean;
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