@theguild/federation-composition/esm/supergraph/validation/rules/contextual-argument-rule.js

Open Source Composition library for Apollo Federation

import { GraphQLError } from "graphql";
export function ContextualArgumentRule(context) {
    return {
        ObjectTypeFieldArg(objectState, fieldState, argState) {
            if (!argState.fromContext) {
                return;
            }
            const isRequiredSomewhere = Array.from(argState.byGraph.values()).some((argInGraph) => !argInGraph.fromContext &&
                argInGraph.type.endsWith("!") &&
                !argInGraph.defaultValue);
            if (!isRequiredSomewhere) {
                return;
            }
            const coordinate = `${objectState.name}.${fieldState.name}(${argState.name}:)`;
            context.reportError(new GraphQLError(`Argument "${coordinate}" is contextual in at least one subgraph but in "${coordinate}" it does not have @fromContext, is not nullable and has no default value.`, {
                extensions: {
                    code: "CONTEXTUAL_ARGUMENT_NOT_CONTEXTUAL_IN_ALL_SUBGRAPHS",
                },
            }));
        },
    };
}