| 1 | import { doTypesOverlap, isCompositeType } from 'graphql';
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| 2 | export function implementsAbstractType(schema, typeA, typeB) {
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| 3 | if (typeB == null || typeA == null) {
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| 4 | return false;
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| 5 | }
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| 6 | else if (typeA === typeB) {
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| 7 | return true;
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| 8 | }
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| 9 | else if (isCompositeType(typeA) && isCompositeType(typeB)) {
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| 10 | return doTypesOverlap(schema, typeA, typeB);
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| 11 | }
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| 12 | return false;
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| 13 | }
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