| import { groupBy } from '../../jsutils/groupBy.mjs'; |
| 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) { |
| return { |
| OperationDefinition(operationNode) { |
| var _operationNode$variab; |
| |
| // See: https://github.com/graphql/graphql-js/issues/2203 |
| |
| /* c8 ignore next */ |
| const variableDefinitions = |
| (_operationNode$variab = operationNode.variableDefinitions) !== null && |
| _operationNode$variab !== void 0 |
| ? _operationNode$variab |
| : []; |
| const seenVariableDefinitions = groupBy( |
| variableDefinitions, |
| (node) => node.variable.name.value, |
| ); |
| |
| for (const [variableName, variableNodes] of seenVariableDefinitions) { |
| if (variableNodes.length > 1) { |
| context.reportError( |
| new GraphQLError( |
| `There can be only one variable named "$${variableName}".`, |
| { |
| nodes: variableNodes.map((node) => node.variable.name), |
| }, |
| ), |
| ); |
| } |
| } |
| }, |
| }; |
| } |