graphql/validation/rules/NoUndefinedVariablesRule.mjs

A Query Language and Runtime which can target any service.

import { GraphQLError } from "../../error/GraphQLError.mjs";
export function NoUndefinedVariablesRule(context) {
    return {
        OperationDefinition(operation) {
            const variableNameDefined = new Set(operation.variableDefinitions?.map((node) => node.variable.name.value));
            const usages = context.getRecursiveVariableUsages(operation);
            for (const { node, fragmentVariableDefinition } of usages) {
                if (fragmentVariableDefinition) {
                    continue;
                }
                const varName = node.name.value;
                if (!variableNameDefined.has(varName)) {
                    context.reportError(new GraphQLError(operation.name
                        ? `Variable "$${varName}" is not defined by operation "${operation.name.value}".`
                        : `Variable "$${varName}" is not defined.`, { nodes: [node, operation] }));
                }
            }
        },
    };
}
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