| import { GraphQLError } from "../../error/GraphQLError.mjs"; |
| |
| /** |
| * Unique variable names |
| * |
| * A GraphQL operation is only valid if all its variables are uniquely named. |
| */ |
| export function UniqueVariableNamesRule(context) { |
| var knownVariableNames = Object.create(null); |
| return { |
| OperationDefinition: function OperationDefinition() { |
| knownVariableNames = Object.create(null); |
| }, |
| VariableDefinition: function VariableDefinition(node) { |
| var variableName = node.variable.name.value; |
| |
| if (knownVariableNames[variableName]) { |
| context.reportError(new GraphQLError("There can be only one variable named \"$".concat(variableName, "\"."), [knownVariableNames[variableName], node.variable.name])); |
| } else { |
| knownVariableNames[variableName] = node.variable.name; |
| } |
| } |
| }; |
| } |