@graphql-tools/graphql/esm/validation/rules/NoUndefinedVariablesRule.js

Fork of GraphQL.js

import { GraphQLError } from '../../error/GraphQLError.js';
/**
 * No undefined variables
 *
 * A GraphQL operation is only valid if all variables encountered, both directly
 * and via fragment spreads, are defined by that operation.
 *
 * See https://spec.graphql.org/draft/#sec-All-Variable-Uses-Defined
 */
export function NoUndefinedVariablesRule(context) {
    let variableNameDefined = Object.create(null);
    return {
        OperationDefinition: {
            enter() {
                variableNameDefined = Object.create(null);
            },
            leave(operation) {
                const usages = context.getRecursiveVariableUsages(operation);
                for (const { node } of usages) {
                    const varName = node.name.value;
                    if (variableNameDefined[varName] !== true) {
                        context.reportError(new GraphQLError(operation.name
                            ? `Variable "$${varName}" is not defined by operation "${operation.name.value}".`
                            : `Variable "$${varName}" is not defined.`, { nodes: [node, operation] }));
                    }
                }
            },
        },
        VariableDefinition(node) {
            variableNameDefined[node.variable.name.value] = true;
        },
    };
}