@graphql-tools/graphql/cjs/validation/rules/NoUnusedVariablesRule.js

Fork of GraphQL.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.NoUnusedVariablesRule = void 0;
const GraphQLError_js_1 = require("../../error/GraphQLError.js");
/**
 * No unused variables
 *
 * A GraphQL operation is only valid if all variables defined by an operation
 * are used, either directly or within a spread fragment.
 *
 * See https://spec.graphql.org/draft/#sec-All-Variables-Used
 */
function NoUnusedVariablesRule(context) {
    let variableDefs = [];
    return {
        OperationDefinition: {
            enter() {
                variableDefs = [];
            },
            leave(operation) {
                const variableNameUsed = Object.create(null);
                const usages = context.getRecursiveVariableUsages(operation);
                for (const { node } of usages) {
                    variableNameUsed[node.name.value] = true;
                }
                for (const variableDef of variableDefs) {
                    const variableName = variableDef.variable.name.value;
                    if (variableNameUsed[variableName] !== true) {
                        context.reportError(new GraphQLError_js_1.GraphQLError(operation.name
                            ? `Variable "$${variableName}" is never used in operation "${operation.name.value}".`
                            : `Variable "$${variableName}" is never used.`, { nodes: variableDef }));
                    }
                }
            },
        },
        VariableDefinition(def) {
            variableDefs.push(def);
        },
    };
}
exports.NoUnusedVariablesRule = NoUnusedVariablesRule;