@envelop/immediate-introspection/esm/index.js

## Getting Started

import { BREAK } from 'graphql';
const OnNonIntrospectionFieldReachedValidationRule = (onNonIntrospectionField) => ctx => {
    const rootQueryType = ctx.getSchema().getQueryType();
    const rootMutationType = ctx.getSchema().getMutationType();
    const rootSubscriptionType = ctx.getSchema().getSubscriptionType();
    return {
        Field(field) {
            const parentType = ctx.getParentType();
            const isQuery = parentType === rootQueryType;
            const isMutation = parentType === rootMutationType;
            const isSubscription = parentType === rootSubscriptionType;
            if ((isQuery && !field.name.value.startsWith('__')) || isMutation || isSubscription) {
                onNonIntrospectionField();
                return BREAK;
            }
            return undefined;
        },
    };
};
const fastIntroSpectionSymbol = Symbol('fastIntrospection');
/**
 * In case a GraphQL operation only contains introspection fields the context building can be skipped completely.
 * With this plugin any further context extensions will be skipped.
 */
export const useImmediateIntrospection = () => {
    return {
        onValidate({ addValidationRule }) {
            let isIntrospectionOnly = true;
            addValidationRule(OnNonIntrospectionFieldReachedValidationRule(() => {
                isIntrospectionOnly = false;
            }));
            return function afterValidate({ extendContext }) {
                if (isIntrospectionOnly) {
                    extendContext({ [fastIntroSpectionSymbol]: true });
                }
            };
        },
        onContextBuilding({ context, breakContextBuilding }) {
            if (context[fastIntroSpectionSymbol]) {
                // hijack and skip all other context related stuff.
                // We dont need a context!
                breakContextBuilding();
            }
        },
    };
};