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Contents
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),
},
),
);
}
}
},
};
}
Version data entries
26 entries across 26 versions & 1 rubygems