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function PossibleFragmentSpreadsRule
import { PossibleFragmentSpreadsRule } from "https://dotland.deno.dev/x/graphql_deno@v15.0.0/lib/index.d.ts";

Possible fragment spread

A fragment spread is only valid if the type condition could ever possibly be true: if there is a non-empty intersection of the possible parent types, and possible types which pass the type condition.