Marc Mintel
5397309103
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33 lines
1.0 KiB
Plaintext
33 lines
1.0 KiB
Plaintext
import type { GraphQLCompositeType, GraphQLType } from '../type/definition';
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import type { GraphQLSchema } from '../type/schema';
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/**
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* Provided two types, return true if the types are equal (invariant).
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*/
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export declare function isEqualType(
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typeA: GraphQLType,
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typeB: GraphQLType,
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): boolean;
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/**
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* Provided a type and a super type, return true if the first type is either
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* equal or a subset of the second super type (covariant).
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*/
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export declare function isTypeSubTypeOf(
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schema: GraphQLSchema,
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maybeSubType: GraphQLType,
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superType: GraphQLType,
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): boolean;
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/**
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* Provided two composite types, determine if they "overlap". Two composite
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* types overlap when the Sets of possible concrete types for each intersect.
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*
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* This is often used to determine if a fragment of a given type could possibly
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* be visited in a context of another type.
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*
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* This function is commutative.
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*/
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export declare function doTypesOverlap(
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schema: GraphQLSchema,
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typeA: GraphQLCompositeType,
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typeB: GraphQLCompositeType,
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): boolean;
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