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node_modules/graphql/validation/rules/OverlappingFieldsCanBeMerged.d.ts

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+import { ASTVisitor } from '../../language/visitor';
+import { ValidationContext } from '../ValidationContext';
+
+export function fieldsConflictMessage(
+  responseName: string,
+  reason: ConflictReasonMessage,
+): string;
+
+/**
+ * Overlapping fields can be merged
+ *
+ * A selection set is only valid if all fields (including spreading any
+ * fragments) either correspond to distinct response names or can be merged
+ * without ambiguity.
+ */
+export function OverlappingFieldsCanBeMerged(
+  context: ValidationContext,
+): ASTVisitor;
+
+// Field name and reason.
+type ConflictReason = [string, string];
+
+// Reason is a string, or a nested list of conflicts.
+type ConflictReasonMessage = string | Array<ConflictReason>;